Journal articles on the topic 'Parallel data-transmission systems'
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1
Varshavsky, V. I., V. B. Marakhovsky, and R. A. Lashevsky. "Self-Timed Data Transmission in Massively Parallel Computing Systems." Integrated Computer-Aided Engineering 4, no. 1 (January 1, 1997): 47–65. http://dx.doi.org/10.3233/ica-1997-4104.
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Younus, Safwan Hafeedh, Aubida A. Al-Hameed, Ahmed Taha Hussein, Mohammed Thamer Alresheedi, and Jaafar M. H. Elmirghani. "Parallel Data Transmission in Indoor Visible Light Communication Systems." IEEE Access 7 (2019): 1126–38. http://dx.doi.org/10.1109/access.2018.2886398.
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Ehlert, M. "Different approaches of high speed data transmission standards." Advances in Radio Science 2 (May 27, 2005): 187–93. http://dx.doi.org/10.5194/ars-2-187-2004.
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Abstract. A number of standards addresses the problem of high-speed data transmission on serial or serial-parallel data lines. Serial-parallel data transmission means the transmitted information is distributed on parallel data lines. Even though several standards exist, there are only a few basic techniques used in most of these standards. This paper is giving an overview of these different basic techniques used in the physical layer of today’s data transmission standards, for example DVI/HDMI, USB2.0, Infiniband, SFI5, etc. [1–9]. The main focus lies on the approaches used for physical signaling, line coding and information synchronization in serial and serialparallel systems. In addition, currently discussed techniques to improve data transmission in the future will be presented.
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Wang, Kaifeng, Hui Li, and Qi Zhang. "Parallel Redundancy Protocol for Railway Wireless Data Communication Network." Wireless Communications and Mobile Computing 2022 (April 5, 2022): 1–13. http://dx.doi.org/10.1155/2022/3312569.
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In order to solve the problem that the railway application services have strict requirements on the reliability, delay, and other indicators of mobile data communication, a parallel redundancy protocol for the railway wireless data communication network is proposed. By introducing a redundancy adaptation layer into the standard TCP/IP model, multi-link parallel data transmission is realized and transparent to the network layer and above. Transmitting multiple copies of the same packet through different paths makes the application systems have redundant communication capability without changing the existing data transmission mode. At the same time, according to the requirements of the receiving entity for redundant data elimination, an improved Bloom filter is proposed. By expanding the bit array and using the countdown mechanism, the elements in the data set can be dynamically inserted, deleted, and retrieved over time. Theoretical analysis and test results show that the proposed protocol can meet the requirements of data transmission between the on-board and trackside equipment and has the characteristics of simple deployment, high reliability, and high stability. Compared to using a single transmission link, the packet loss rate from field test can be reduced by 39.67% at the maximum, and the throughput and end-to-end data transmission delay are also significantly improved. The test in this paper also shows that the additional delay introduced is a maximum of 5.07 μs, which will not significantly affect the data transmission performance.
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Ermolayev, V. T., A. G. Flaksman, I. M. Averin, and D. V. Gribov. "Effectiveness of Space-Division Multiple-Access in MIMO Communication Systems with Parallel Data Transmission." Radiophysics and Quantum Electronics 47, no. 2 (February 2004): 129–38. http://dx.doi.org/10.1023/b:raqe.0000035694.99846.93.
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Mohsin, Imran, Magnus Karlsson, and Shaofang Gong. "Frequency diplexer network for wireless parallel data transmission and ultrawideband systems utilizing manifold technique." Microwave and Optical Technology Letters 56, no. 8 (May 24, 2014): 1869–71. http://dx.doi.org/10.1002/mop.28464.
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Krupenin, Alexander, Denis Makhov, Alexey Kuzmenko, and Vasily Sirchenko. "Method for Increasing Data Transmission Rate in Parallel Radio Channels of Special-Purpose Robotic Systems." Voprosy kiberbezopasnosti, no. 6(34) (2019): 102–12. http://dx.doi.org/10.21681/2311-3456-2019-6-102-112.
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Kumar, A. Achyuth, Dinesh Biradar, Shiva Teja, and M. Vijay Babu. "Simulation and Implemetation of High-Speed Data Transmission Over Aurora Protocol Using FPGA." International Journal for Research in Applied Science and Engineering Technology 10, no. 5 (May 31, 2022): 3783–87. http://dx.doi.org/10.22214/ijraset.2022.43224.
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Abstract: This paper proposes a simulation and implementation of highspeed knowledge transmission over twin freelance aurora channels on One GTX (Gigabit Transceivers) twin TILE by configuring multi-gigabit transceivers (MGT’s), that area unit gift within the virtex-5 FPGA victimization aurora protocol. (Here GT suggests that Gigabit transceivers (GT) and X indicates that these transceivers belong to Virtex-5 FXT platform. FXT platform supports superior embedded systems with advanced serial connectivity). Firstly, a 128-bit parallel knowledge is to be generated victimization simulators, that area unit enforced victimization VHDL language. The asynchronous first-in first-out (AFIFO) takes this 128-bit knowledge as input and produces an output of 16-bit parallel knowledge. This knowledge goes to the aurora module in parallel type as serial frames (i.e., 8 frames, every frame consists of two bytes). Finally, the 128-bit parallel knowledge is transmitted to the receiver module serially over fibre optic cable at the speed of three.125Gbps victimization study options of virtex5 FPGA. to attain high speed, Multi-Gigabit Transceivers (MGT) area unit used. In virtex-5 FPGA, these Multi-Gigabit Transceivers area unit obtainable as arduous IPs that operates at the clock rate of 156.25 megahertz (MGT clock). For configuring these MGT’s, Aurora protocol is employed, that converts the parallel knowledge into serial knowledge and the other way around. Finally, the information is transmitted on 2 freelance aurora channels and any testing is distributed victimization chip scope professional analyser to verify the integrity of information. Keywords: Aurora protocol, Virtex-5 FPGA, MGT’s, AFIFO, twin freelance Aurora Channels, GTX twin TILE, Serial knowledge Transmission.
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Jia, Jianbo, Yahui Jia, and Xiaofei Li. "Analysis, Design, and Experimental Verification of a Parallel Wireless Power and Data Transmission Method for Rotary Steering Systems." Energies 15, no. 17 (August 31, 2022): 6349. http://dx.doi.org/10.3390/en15176349.
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In the rotary steering system of oil drilling, both power and data transmission are needed. This paper presents a parallel power and data transmission method for a rotating steering system with output voltage control. To reduce the size of the system, power and data are transmitted through the same rotational coupling mechanism. A power transfer resonance circuit is used to suppress the influence of the power transfer on data transmission. Therefore, crosstalk interference between the power and the data transmission channel is negligible. The experimental prototype is built, and the feasibility of the data transfer method and the closed-loop control method is verified. The experimental results are in good agreement with the theoretical analysis.
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Wan, Hon-Hing, and Yu-Kwong Kwok. "High Data Rate Video Transmission Using Parallel TCP Connections: Approaches and Performance Evaluation." Journal of Supercomputing 35, no. 2 (February 2006): 119–39. http://dx.doi.org/10.1007/s11227-006-3071-8.
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Li, Xiaofei, Chunsen Tang, Xin Dai, Pengqi Deng, and Yugang Su. "An Inductive and Capacitive Combined Parallel Transmission of Power and Data for Wireless Power Transfer Systems." IEEE Transactions on Power Electronics 33, no. 6 (June 2018): 4980–91. http://dx.doi.org/10.1109/tpel.2017.2725990.
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Shang, Qing Hua, Shu Feng Guo, Chun Yu Yu, and Dian Shuang Zheng. "Design of a LXI High-Speed Parallel Data Acquisition System." Advanced Materials Research 433-440 (January 2012): 7588–93. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.7588.
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The research on establishing an automated data acquisition system with high speed and accuracy is a hot topic in measurement and testing area. The desire is extremely high in data acquisition systems with high speed, multi-channels and large capacity, therefore research into this field becomes very important and significant. In this paper, a LXI high speed parallel data acquisition system which is combined LXI bus with high-speed data acquisition ability is proposed. And the signal conditioning circuit, ADC, data storage circuit, FPGA main control circuit and LXI interface circuit are introduced in detail. The remote control of the data acquisition system and the high speed transmission of data are realized by using the LXI bus.
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Liu, Peizhou, Tiande Gao, Ruixuan Zhao, Zhaoyong Mao, and Quanzhe Zhu. "A Novel Modulation and Demodulation Method Based on Binary Frequency Shift Keying for Wireless Power and Data-Parallel Transmission." Micromachines 13, no. 9 (August 24, 2022): 1381. http://dx.doi.org/10.3390/mi13091381.
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It is usually necessary but difficult to achieve reliable communication between the primary side and pick-up side in the wireless power transfer (WPT) system due to magnetic interferences. In this paper, a novel parallel transmission method for wireless power and data is proposed, which is based on the frequency shift keying (FSK) modulation and demodulation. The data are transmitted by changing the working frequency of the inverter and then demodulated based on the phase-locked loop (PLL) technology. In this way, the signal before the rectifier circuit for the data demodulation can overcome the influence of power transmission on the data transmission. Finally, a 426 W prototype has been built to verify the effectiveness of the proposed transmission method. The experimental results showed that when the output power changed from tens of watts to hundreds of watts, the data transmission was capable of achieving a stable transmission with a 10 kbps baud rate.
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Li, Xiaofei, Jiefeng Hu, Yong Li, Heshou Wang, Ming Liu, and Pengqi Deng. "A Decoupled Power and Data-Parallel Transmission Method With Four-Quadrant Misalignment Tolerance for Wireless Power Transfer Systems." IEEE Transactions on Power Electronics 34, no. 12 (December 2019): 11531–35. http://dx.doi.org/10.1109/tpel.2019.2920441.
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Izumi, Satoru, Misumi Hata, Hiroyuki Takahira, Mustafa Soylu, Asato Edo, Toru Abe, and Takuo Suganuma. "A Proposal of SDN Based Disaster-Aware Smart Routing for Highly-Available Information Storage Systems and Its Evaluation." International Journal of Software Science and Computational Intelligence 9, no. 1 (January 2017): 69–83. http://dx.doi.org/10.4018/ijssci.2017010105.
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In this paper, the authors propose a SDN based disaster-aware smart routing scheme for highly-available information storage systems. The authors' proposed scheme is based on the concept of Symbiotic Computing to recognize disaster status in Real Space, and provides appropriate routes form Digital Space dynamically. This realizes effective data transmission considering disaster situation and its time variation. In this paper, the authors design and implement their proposed scheme with dynamic multipath routing and parallel data transmission to enhance the network performance. They also evaluate its effectiveness through large-scale network environments.
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Ali T. Shaheen. "Design and Simulation of parallel CDMA System Based on 3D-Hadamard Transform." Diyala Journal of Engineering Sciences 6, no. 4 (December 1, 2013): 45–69. http://dx.doi.org/10.24237/djes.2013.06404.
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Future wireless systems aim to provide higher transmission data rates, improved spectral efficiency and greater capacity. In this paper a spectral efficient two dimensional (2-D) parallel code division multiple access (CDMA) system is proposed for generating and transmitting (2-D CDMA) symbols through 2-D Inter-Symbol Interference (ISI) channel to increase the transmission speed. The 3D-Hadamard matrix is used to generate the 2-D spreading codes required to spread the two-dimensional data for each user row wise and column wise. The quadrature amplitude modulation (QAM) is used as a data mapping technique due to the increased spectral efficiency offered. The new structure simulated using MATLAB and a comparison of performance for serial one-dimensional (1-D) CDMA and parallel (2-D) CDMA is made under Additive White Gaussian Noise (AWGN), flat fading and multi-path selective fading channels conditions. It is found that 2-D CDMA has better speed and performance than serial 1-D CDMA.
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Sun, Yao. "Construction of Artistic Design Patterns Based on Improved Distributed Data Parallel Computing of Heterogeneous Tasks." Mathematical Problems in Engineering 2022 (March 31, 2022): 1–11. http://dx.doi.org/10.1155/2022/3890255.
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With the continuous upgrading of hardware in the terminal equipment, how to provide high-performance computing for low-tech threshold users has become a current research hotspot. In the era of green high-performance computing, the heterogeneous computing system can provide good versatility, performance, and efficiency and has broad development prospects. This article provides an in-depth analysis and research on the construction and application of improved models using the artistic design pattern of heterogeneous tasks and parallel computing. Based on the hardware resources in the existing desktop system, this article optimizes the original heterogeneous parallel technology from the aspects of task division and data transmission to reduce the complexity of data allocation and processing for users. Based on the analysis and study of the multicore CPU and GPU architectures in the desktop system, as well as the original CPU-GPU heterogeneous parallel technology, this article optimizes the solution of heterogeneous parallel computing, designs a heterogeneous parallel computing architecture, and deploys a heterogeneous parallel computing architecture. The nodes of the desktop system constitute the parallel computing system. In terms of task allocation, the computing system divides tasks according to the parallelism of tasks. According to the computing resources and bandwidth conditions of each heterogeneous node, starting from the parallel execution time, the task scheduling algorithm is optimized, and the load balancing scheduling scheme is designed to achieve the optimal allocation of resources. In terms of storage resources, the computing system adopts distributed storage as a whole. The CPU-GPU heterogeneous parallel in the desktop system adopts virtual unified storage. Global distributed storage and local shared storage are used to balance overall performance and programming complexity. This article introduces the design and implementation of JTangSync, a distributed heterogeneous data synchronization system. The system adopts a distributed architecture, and each node is organized by a data source module, a data transmission module, a processor module, etc. The data source module is responsible for extracting data, the data transmission module is mainly responsible for efficient data transmission, and the processor module is responsible for data processing. More importantly, each module is designed as a replaceable plug-in, which is convenient for secondary expansion. Each node relies on ZooKeeper to form a cluster, which realizes distributed functions such as centralized management of distributed resources, failover, and resumed transmission. Compared with the mainstream scheduling algorithms HEFT, CPOP, PEFT, and HSIP on heterogeneous systems participating in the experimental evaluation, the scheduling length ratio of DONF series algorithms is reduced by 36.3%–67.5% and the parallelism is increased by 17%–125% in terms of efficiency. Compared with the existing database synchronization system, the JTangSync system has built-in multiple heterogeneous database data sources and supports the synchronization of complex heterogeneous databases. The system supports users to develop and customize their own data sources and data processing programs, to promote secondary development. By adopting the custom compressed data exchange format and network optimization methods such as packet merging, caching, and adaptive compression algorithm, the system has high performance.
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Balashov, V., A. Lashko, L. Liakhovetsky, V. Oreshkov, and V. Skurikhin. "Evaluation of the Efficiency of the VDSL2 Technology Implementation on the PJSC «Ukrtelecom» Network." Metrology and instruments, no. 5 (October 19, 2018): 15–22. http://dx.doi.org/10.33955/2307-2180(5)2018.15-22.
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The work is devoted to the research of achievable data transmission rates by transmission systems using VDSL2 technology (VDSL2-systems) when working on multi-pair telephone cables of the PJSC «Ukrtelecom» network. The architecture of the modernized telecommunications network of the PJSC «Ukrtelecom» is considered. The results of the experimental research of the achievable transmission rate of the transmission systems using VDSL2 technology for multi-pair telephone cables after the access network of the PJSC «Ukrtelecom» modernization, taking into account the crosstalk that occurs during the parallel operation of the VDSL2-systems and the availability of the ADSL2+-systems working in the multi-pair cable, are provided. Analytical modeling of the VDSL2-systems operation taking into account the characteristics of the «Huawei» equipment and domestic telephone cables is performed. The method for calculating of the transmission rate of the VDSL2-systems has been corrected on the basis of the experiments and modeling results. Using the corrected method, the research of the VDSL2-systems transmission rate dependence on the length of the subscriber line, the load coefficient of the multi-pair cable by transmission systems and the external additive noises level is carried out. The recommendations on the implementation of the VDSL2 technology on the PJSC «Ukrtelecom» network based on the results of the research are given.
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Kang, Myeongjin, and Daejin Park. "Lightweight Microcontroller with Parallelized ECC-Based Code Memory Protection Unit for Robust Instruction Execution in Smart Sensors." Sensors 21, no. 16 (August 16, 2021): 5508. http://dx.doi.org/10.3390/s21165508.
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Embedded systems typically operate in harsh environments, such as where there is external shock, insufficient power, or an obsolete sensor after the replacement cycle. Despite these harsh environments, embedded systems require data integrity for accurate operation. Unintended data changes can cause a serious error in reduced instruction set computer (RISC)-based small embedded systems. For instance, if communication is performed on an edge, where there is insufficient power supply, the peak threshold is not reached, resulting in data transmission failure or incorrect data transmission. To ensure data integrity, we use an error-correcting code (ECC), which can detect and correct errors. The ECC parity bit and data are stored together using additional ECC memory, and the original data are extracted through the ECC decoding process. The process of extracting the original data is executed in the instruction fetch stage, where a bottleneck appears in the RISC-based structure. When the ECC decoding process is executed in the bottleneck, the instruction fetch stage increases the instruction fetch time and significantly reduces the overall performance. In this study, we attempt to minimize the effect of ECC on the transmission speed by executing the ECC decoding process in parallel to improve speed by degrading the bottleneck. To evaluate the performance of a parallelized ECC decoding block, we applied the proposed method to the tiny processing unit (TPU) with a RISC-based von Neumann structure and compared memory usage, speed, and reliability according to different transmission success rates in each model. The experiment was conducted using a benchmark that repeatedly executed several 3*3 matrix calculations, and reliability improvement was compared by corrupting the stored random date to confirm the reliability of the transmission success rate. As a result, in the proposed model, using the additional parity bits for parallel processing, memory usage increased by 10 bits per instruction, reducing the data rate from 80 to 61%. However, it showed an improvement in overall reliability and a 7% increase in speed.
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Yu, Jiayin, Yaqin Xie, Shiyu Guo, Yanqi Zhou, and Erfu Wang. "Parallel Encryption of Noisy Images Based on Sequence Generator and Chaotic Measurement Matrix." Complexity 2020 (May 7, 2020): 1–18. http://dx.doi.org/10.1155/2020/1987670.
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With the rapid development of information technology in today’s society, the security of transmission and the storage capacity of hardware are increasingly required in the process of image transmission. Compressed sensing technology can achieve data sampling and compression at the rate far lower than that of the Nyquist sampling theorem and can effectively improve the efficiency of information transmission. Aiming at the problem of weak security of compressed sensing, this study combines the cryptographic characteristics of chaotic systems with compressed sensing technology. In the actual research process, the existing image encryption technology needs to be applied to the hardware. This paper focuses on the combination of image encryption based on compressed sensing and digital logic circuits. We propose a novel technology of parallel image encryption based on a sequence generator. It uses a three-dimensional chaotic map with multiple stability to generate a measurement matrix. This study also analyzes the effectiveness, reliability, and security of the parallel encryption algorithm for source noise pollution with different distribution characteristics. Simulation results show that parallel encryption technology can effectively improve the efficiency of information transmission and greatly enhance its security through key space expansion.
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Fedosov, Valentin, and Andrey Legin. "Wireless data transmission in underwater hydroacoustic environment based on MIMO-OFDM system and application adaptive algorithm at the receiver side." Serbian Journal of Electrical Engineering 16, no. 1 (2019): 71–83. http://dx.doi.org/10.2298/sjee1901071f.
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To increase the transmission speed in wireless data transmission systems, it is necessary to change either the bandwidth or the spectral efficiency, or both simultaneously. Systems based on Multi-Input Multi-Output (MIMO) methods can significantly increase spectral efficiency through parallel transmission using several transmitters and receivers. Such systems are particularly attractive for use in underwater acoustic communications systems, which are normally bandwidth-reduced. MIMO system along with OFDM (Orthogonal Frequency-Division Multiplexing) is a popular technology used in wireless networks to provide a high data transfer rate and resistance to multipath and fading of the channel. The implementation of such a system requires being aware of the channel condition at the receiver, and can be provided by means of using channel parameter estimation schemes. The adaptation task on the receiving side, apart from peak of pattern formation in the direction of the signal expected, also includes the interference-source suppression, that is, the issue of implementing spatial filtering of interference from other directions. However, since the signal and noise direction of arrival are unknown, we get a system with adaptive antenna array (AA). In the proposed research, a phase antenna array was used with controlled weighing.
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Zhouhuo, Wang. "Parallel Classification Algorithm Design of Human Resource Big Data Based on Spark Platform." Security and Communication Networks 2021 (December 26, 2021): 1–10. http://dx.doi.org/10.1155/2021/5811918.
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In order to solve the problem of large data classification of human resources, a new parallel classification algorithm of large data of human resources based on the Spark platform is proposed in this study. According to the spark platform, it can complete the update and distance calculation of the human resource big data clustering center and design the big data clustering process. Based on this, the K-means clustering method is introduced to mine frequent itemsets of large data and optimize the aggregation degree of similar large data. A fuzzy genetic algorithm is used to identify the balance of big data. This study adopts the selective integration method to study the unbalanced human resource database classifier in the process of transmission, introduces the decision contour matrix to construct the anomaly support model of the set of unbalanced human resource data classifier, identifies the features of the big data of human resource in parallel, repairs the relevance of the big data of human resource, introduces the improved ant colony algorithm, and finally realizes the design of the parallel classification algorithm of the big data of human resource. The experimental results show that the proposed algorithm has a low time cost, good classification effect, and ideal parallel classification rule complexity.
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Fan, Youping, Peng Zhang, Ben Shang, Dianlang Wang, Wen’an Li, Dongjian Zhuang, Zihan Chen, Zhaoyi Zhang, and Wu Wen. "Thermal Characteristic Simulation Study of Multicolumn Parallel Zinc Oxide Arresters under Extreme Operating Conditions." Electronics 12, no. 1 (December 26, 2022): 100. http://dx.doi.org/10.3390/electronics12010100.
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The arrester plays an important role in the protection of the DC transmission system, and its thermal characteristics under different operating conditions greatly affect its performance. To study the thermal characteristics of multicolumn parallel arresters under extreme operating conditions in a DC system, considering the influence of SF6 fluid, the structural parameters of the ±500 kV Niu Cong DC transmission project were applied for this research. Firstly, a 3D model of the four-column parallel zinc oxide arrester installed on the neutral bus of the ±500 kV Niu Cong DC transmission project was built in ANSYS to analyze its thermal conduction. Then, the electromagnetic transient model of the Niu Cong DC transmission system was established in PSCAD to study the withstood energy of a four-column parallel zinc oxide arrester under 22 typical fault conditions in three operation modes. Based on the extreme operating conditions obtained, simulations of steady-state and transient thermal characteristics were performed considering the influence of SF6 fluid flow on the heat dissipation of the arrester. Finally, the field-test temperature test on the four-column parallel zinc oxide arrester was carried out to validate the effectiveness of the proposed simulation model and calculation method, with simulation data matching well with the field-test data. The results also conclude the thermal characteristics findings to reveal the thermal conduction of multicolumn arresters under extreme operating conditions.
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Wang, Yu, Yuejuan Lv, Baoquan Jin, Yuelin Xu, Yu Chen, Xin Liu, and Qing Bai. "Co-Processing Parallel Computation for Distributed Optical Fiber Vibration Sensing." Applied Sciences 10, no. 5 (March 4, 2020): 1747. http://dx.doi.org/10.3390/app10051747.
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Rapid data processing is crucial for distributed optical fiber vibration sensing systems based on a phase-sensitive optical time domain reflectometer (Φ-OTDR) due to the huge amount of continuously refreshed sensing data. The vibration sensing principle is analyzed to study the data flow of Rayleigh backscattered light among the different processing units. A field-programmable gate array (FPGA) is first chosen to synchronously implement pulse modulation, data acquisition and transmission in parallel. Due to the parallelism characteristics of numerous independent algorithm kernels, graphics processing units (GPU) can be used to execute the same computation instruction by the allocation of multiple threads. As a conventional data processing method for the sensing system, a differential accumulation algorithm using co-processing parallel computation is verified with a time of 1.6 μs spent of the GPU, which is 21,250 times faster than a central processing unit (CPU) for a 2020 m length of optical fiber. Moreover, the cooperation processes of the CPU and GPU are realized for the spectrum analysis, which could shorten substantially the time of fast Fourier transform analysis processing. The combination of FPGA, CPU and GPU can largely enhance the capacity of data acquisition and processing, and improve the real-time performance of distributed optical fiber vibration sensing systems.
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Fang, Hao, and Wan Hua Wei. "Research on Peak-to-Average Power Ratio for OFDM System." Advanced Materials Research 823 (October 2013): 366–69. http://dx.doi.org/10.4028/www.scientific.net/amr.823.366.
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OFDM is a special multi-carrier modulation, its basic idea is to make high-speed transmission of data flow through the serial-parallel conversion and make it to be the low-speed transmission of data flow in a number of narrow-band orthogonal sub-channels. However, a major drawback of OFDM signals is their high Peak-to-Average Power Ratio (PAPR), which makes the inter modulation distortion occur due to the nonlinearity of the high power amplifier. The distortion severely deteriorates the performance of the OFDM systems. According the problems mentioned above, this dissertation focuses on the reducing the PAPR algorithms design for OFDM systems, such as SLM and PTS. In summary, this paper has completed the OFDM system simulation with Matlab and analyses the result.
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Browne, Sid, E. G. CoffmanJR., E. N. Gilbert, and Paul E. Wright. "Gated, Exhaustive, Parallel Service." Probability in the Engineering and Informational Sciences 6, no. 2 (April 1992): 217–39. http://dx.doi.org/10.1017/s0269964800002461.
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We analyze gated, exhaustive service of an infinite-server system with vacations. Customers enter a queue in a Poisson stream. The servers, working in parallel, serve customers in stages. A stage begins with all customers transferred from the queue to the servers (the gate opens). The servers then begin serving these customers, all simultaneously. The stage ends when their services are completed. Service is exhaustive because the servers must again examine the queue to see if any new customers arrived during the last stage. If there are any, a new stage begins. If there are none, the servers move on to other work. The time spent away from the queue is called vacation time. The queue may represent a node or station in a data transmission network and the servers may be communication channels.We analyze the equilibrium behavior of the number of requests served during a stage for general service and vacation time distributions. This analysis leads to the solution of a Fredholm integral equation of the second kind. We find conditions under which the system is stable and compute bounds on performance metrics of interest. Approximate techniques are introduced and tested. Finally, an extension to polling systems is studied.
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Li, Bingzheng, Jinchen Xu, and Zijing Liu. "SW-LZMA: Parallel Implementation of LZMA Based on SW26010 Many-Core Processor." Wireless Communications and Mobile Computing 2021 (September 18, 2021): 1–10. http://dx.doi.org/10.1155/2021/4486494.
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With the development of high-performance computing and big data applications, the scale of data transmitted, stored, and processed by high-performance computing cluster systems is increasing explosively. Efficient compression of large-scale data and reducing the space required for data storage and transmission is one of the keys to improving the performance of high-performance computing cluster systems. In this paper, we present SW-LZMA, a parallel design and optimization of LZMA based on the Sunway 26010 heterogeneous many-core processor. Combined with the characteristics of SW26010 processors, we analyse the storage space requirements, memory access characteristics, and hotspot functions of the LZMA algorithm and implement the thread-level parallelism of the LZMA algorithm based on Athread interface. Furthermore, we make a fine-grained layout of LDM address space to achieve DMA double buffer cyclic sliding window algorithm, which optimizes the performance of SW-LZMA. The experimental results show that compared with the serial baseline implementation of LZMA, the parallel LZMA algorithm obtains a maximum speedup ratio of 4.1 times using the Silesia corpus benchmark, while on the large-scale data set, speedup is 5.3 times.
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Cao, M., K. W. Wang, Y. Fujii, and W. E. Tobler. "Development of a Friction Component Model for Automotive Powertrain System Analysis and Shift Controller Design based on Parallel-Modulated Neural Networks." Journal of Dynamic Systems, Measurement, and Control 127, no. 3 (August 17, 2004): 382–405. http://dx.doi.org/10.1115/1.1978909.
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In this study, a new hybrid-neural-network-based friction component model is developed for powertrain (PT) dynamic analysis and controller design. This new model, with significantly improved input-output scalability over conventional neural network configuration, has the capability to serve as a forward as well as an inverse system model. The structural information of the available physical and empirical correlations is utilized to construct a parallel-modulated neural network (PMNN) architecture consisting of small parallel sub-networks reflecting specific mechanisms of the friction component engagement process. The PMNN friction component model isolates the contribution of engagement pressure on engagement torque while identifying the nonlinear characteristics of the pressure-torque correlation. Furthermore, it provides a simple torque formula that is scalable with respect to engagement pressure. The network is successfully trained, tested and analyzed, first using analytical data at the component level and then using experimental data measured in a transmission system. The PMNN friction component model, together with a comprehensive powertrain model, is implemented to simulate the shifting process of an automatic transmission (AT) system under various operating conditions. Simulation results demonstrate that the PMNN model can be effectively applied as a part of powertrain system model to accurately predict transmission shift dynamics. A pressure-profiling scheme using a quadratic polynomial pressure-torque relationship of the PMNN model is developed for transmission shift controller design. The results illustrate that the proposed pressure profiling technique can be applied to a wide range of operating conditions. This study demonstrates the potential of the PMNN architecture as a new dynamic system-modeling concept: It not only outperforms the conventional network modeling techniques in accuracy and numerical efficiency, but also provides a new tool for transmission controller design to improve shift quality.
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Agbli, Kréhi Serge, Mickaël Hilairet, and Frédéric Gustin. "Real-Time Control Based on a CAN-Bus of Hybrid Electrical Systems." Energies 13, no. 17 (September 1, 2020): 4502. http://dx.doi.org/10.3390/en13174502.
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Power management of a one-converter parallel structure with battery and supercapacitor is addressed in this paper. The controller is implemented on a DSP from a Microchip and uses a Controller Area Network (CAN) bus communication for data exchange. However, the low data transmission rate of the CAN bus data impacts the performances of regular power management strategies. This paper details an initial strategy with a charge sustaining mode for an application coupling a battery with supercapacitors, in which low performances have been witnessed due to the high sampling time of the CAN bus data. Therefore, a new strategy is proposed to tackle the sample time issue based on a depleting mode. Simulation and experimental results with a dsPIC33EP512MU810 DSP based on a 10 kW hybrid system proves the feasibility of the proposed approach.
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Tran, Dat, Shahid Aslam, Nicolas Gorius, and George Nehmetallah. "Parallel Computation of CRC-Code on an FPGA Platform for High Data Throughput." Electronics 10, no. 7 (April 6, 2021): 866. http://dx.doi.org/10.3390/electronics10070866.
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With the rapid advancement of radiation hard imaging technology, space-based remote sensing instruments are becoming not only more sophisticated but are also generating substantially more amounts of data for rapid processing. For applications that rely on data transmitted from a planetary probe to a relay spacecraft to Earth, alteration or discontinuity in data over a long transmission distance is likely to happen. Cyclic Redundancy Check (CRC) is one of the most well-known package error check techniques in sensor networks for critical applications. However, serial CRC computation could be a bottleneck of the throughput in such systems. In this work, we design, implement, and validate an efficient hybrid look-up-table and matrix transformation algorithm for high throughput parallel computational unit to speed-up the process of CRC computation using both CPU and Field Programmable Gate Array (FPGA) with comparison of both methods.
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Wen, Chunming, Minbo Chen, and Qing Xu. "Study and Optimization of Transmission Characteristics of the Magnetically Coupled Resonant Wireless Transmission System." Electronics 11, no. 13 (June 21, 2022): 1940. http://dx.doi.org/10.3390/electronics11131940.
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The topology and parameter characteristics of the wireless energy transmission system are the main factors affecting the system’s performance. A series–parallel–series–parallel (spsp) topology for magnetically coupled wireless energy transmission is proposed to address the problems of low efficiency and low output power when transmitting electrical energy in the conventional magnetically coupled topology. The spsp topology is compared with the conventional topology based on circuit theory, and the two structures are modeled, characterized, and verified in detail. Simulations and tests are performed for the transmission conditions, an improved Gray Wolf optimization algorithm is proposed, and a physical system is built. Experiments show that the spsp structure is superior near the designed circuit parameters when the network works in a resonant state. The improved Gray Wolf optimization algorithm is then used to find the optimal parameters, and the transmission efficiency reaches 90.53%, which effectively improves the transmission performance of the system. The established physical system utilizes the optimized parameters for coil structure and coil offset experiments, and the average transmission efficiency is 83.75%, with an error of 6.78% calculated by data measurement. The rationality of the proposed structure and the correctness of the simulation parameter design method are verified, and it is hoped that the proposed system and circuit structure in this paper will provide a reference for the design of a magnetically coupled wireless energy transmission system.
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Fukushima, T., A. Kasukawa, M. Iwase, T. Namegaya, and M. Shibata. "Compressively strained 1.3 mu m InAsP/InP and GaInAsP/InP multiple quantum well lasers for high-speed parallel data transmission systems." IEEE Journal of Quantum Electronics 29, no. 6 (June 1993): 1536–43. http://dx.doi.org/10.1109/3.234388.
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Schmidt, C., E. Lloret Fuentes, and M. Buchholz. "Investigations and system design for simultaneous energy and data transmission through inductively coupled resonances." Advances in Radio Science 13 (November 3, 2015): 217–26. http://dx.doi.org/10.5194/ars-13-217-2015.
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Abstract. Wireless Power Transfer (WPT) with simultaneous data transmission through coupled magnetic resonators is investigated in this paper. The development of this system is dedicated to serve as a basis for applications in the field of Ambient Assisted Living (AAL), for example tracking vital parameters remotely, charge and control sensors and so on. Due to these different scenarios we consider, it is important to have a system which is reliable under the circumstance of changing positioning of the receiving device. State of the art radio systems would be able to handle this. Nevertheless, energy harvesting from far field sources is not sufficient to power the devices additionally on mid-range distances. For this reason, coupled magnetic resonant circuits are proposed as a promising alternative, although suffering from more complex positioning dependency. Based on measurements on a simple prototype system, an equivalent circuit description is used to model the transmission system dependent on different transmission distances and impedance matching conditions. Additionally, the simulation model is used to extract system parameters such as coupling coefficients, coil resistance and self-capacitance, which cannot be calculated in a simple and reliable way. Furthermore, a mathematical channel model based on the schematic model has been built in MATLAB©. It is used to point out the problems occurring in a transmission system with variable transmission distance, especially the change of the passband's centre frequency and its bandwidth. Existing solutions dealing with this distance dependent behaviour, namely the change of the transmission frequency dependent on distance and the addition of losses to the resonators to increase the bandwidth, are considered as not inventive. First, changing the transmission frequency increases the complexity in the data transmission system and would use a disproportional total bandwidth compared to the actually available bandwidth. Additionally, adding losses causes a decrease in the energy transmission efficiency. Based on these facts, we consider a system that changes the channel itself by tuning the resonant coils in a way that the passband is always at a fixed frequency. This would overcome the previously described issues, and additionally could allow for the possibility to run several independent transmission systems in parallel without disturbing each other.
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Yi, Ze Quang, and Pan Nan. "Research of Multi-Channel Vehicle Brake Performance Testing System." Applied Mechanics and Materials 644-650 (September 2014): 1144–48. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.1144.
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For the outstanding problems of traditional vehicle foundation braking performance testing systems’ such as lacking of test & analysis methods, inflexible and not easy to carry, a multi-channel Vehicle foundation break performance testing system based on CompactRIO embedded platform and LabVIEW was developed. The system design concept and concrete implementation of the key technologies such as parallel acquisition and data transmission, large data processing and time-frequency noise reduction were all introduces in detail. Actual break test experiment shows the effectiveness and reliability of the system.
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Hu, Songlin, Dong Yue, Min Shi, and Xiangpeng Xie. "Discrete-Time Event-Triggered Control of Nonlinear Wireless Networked Control Systems." Abstract and Applied Analysis 2014 (2014): 1–14. http://dx.doi.org/10.1155/2014/860438.
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This paper investigates the problem of stabilization of nonlinear discrete-time networked control systems (NCSs) with event-triggering communication scheme in the presence of signal transmission delay. A Takagi-Sugeno (T-S) fuzzy model and parallel-distributed compensation (PDC) scheme are first employed to design a nonlinear fuzzy event-triggered controller for the stabilization of nonlinear discrete-time NCSs. The idea of the event-triggering communication scheme (i.e., a soft computation algorithm) under consideration is that the current sensor data is transmitted only when the current sensor data and the previously transmitted one satisfy a certain state-dependent trigger condition. By taking the signal transmission delay into consideration and using delay system approach, a T-S fuzzy delay system model is established to describe the nonlinear discrete-time NCSs with event-triggering communication scheme. Attention is focused on the design of fuzzy event-triggered controller which ensures asymptotic stability of the closed-loop fuzzy systems. Linear matrix inequality- (LMI-) based conditions are formulated for the existence of admissible fuzzy event-triggered controller. If these conditions are feasible, a desired fuzzy event-triggered controller can be readily constructed. A nonlinear mass-spring-damper mechanical system is presented to demonstrate the effectiveness of the proposed method.
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Karnakanti Nikhila, Gundapu Rachana, Motamarri Sai Bhavani, and Mohammad Awaiz. "PAPR Analysis of OFDM using Selective Mapping Method." Journal of Soft Computing Paradigm 4, no. 3 (October 3, 2022): 188–99. http://dx.doi.org/10.36548/jscp.2022.3.007.
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A common standard modulation for several high data rate wireless communication systems is Orthogonal Frequency-Division Multiplexing (OFDM). It operates by splitting up large streams of data into several parallel streams with minimal data rates. Compared to single carrier modulation systems, OFDM offers various benefits. Some of these benefits are high transmission bit rates, great spectral efficiency, and sensitivity to frequency fading channels. However, there are drawbacks with OFDM. Among the major issues is the high Peak to Average Power Ratio (PAPR), due to which the system complexity increases. The Selective Mapping approach is used in this study to lower the OFDM PAPR. In this article, simulation has been done using MATLAB, evaluated PSD, spectral efficiency, BER performance and PAPR analysis of OFDM system.
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Uddin, Jia, Mohammed Faisal, Md Facihul Azam, and A. F. M. Muzahidur Rahman. "Performance Analysis of Multicarrier Code Division Multiple Access over Rayleigh Fading Channel." Advanced Materials Research 457-458 (January 2012): 985–88. http://dx.doi.org/10.4028/www.scientific.net/amr.457-458.985.
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Recently, multi-carrier transmission schemes have been introduced into Code Division Multiple Access (CDMA) systems to gain advantages for high data rate transmission as well as security. Due to pseudorandom code there is no chance to Inter Symbol Interference (ISI). There are different techniques to mitigate multipath fading. One of the method is to transmit identical narrowband direct-sequence (DS) waveforms in parallel over a number of sub-channels using frequency diversity. Implementation this multi-carrier modulation technique in CDMA system is known as multi-carrier CDMA (MC-CDMA). In Rayleigh fading channel, due to multi-carrier modulation, when one subcarrier goes deep fade another subcarrier may remain safe. Therefore it combats multi-path fading and signal can be received in low bit error rate.
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Dubey, Rahul, S. R. Samantaray, B. K. Panigrahi, and G. V. Venkoparao. "On-line Adaptive and Intelligent Distance Relaying Scheme for Power Network." International Journal of Emerging Electric Power Systems 16, no. 5 (October 1, 2015): 473–89. http://dx.doi.org/10.1515/ijeeps-2015-0036.
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Abstract The paper presents an on-line sequential extreme learning machine (OS-ELM) based fast and accurate adaptive distance relaying scheme (ADRS) for transmission line protection. The proposed method develops an adaptive relay characteristics suitable to the changes in the physical conditions of the power systems. This can efficiently update the trained model on-line by partial training on the new data to reduce the model updating time whenever a new special case occurs. The effectiveness of the proposed method is validated on simulation platform for test system with two terminal parallel transmission lines with complex mutual coupling. The test results, considering wide variations in operating conditions of the faulted power network, indicate that the proposed adaptive relay setting provides significant improvement in the relay performance.
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Hwang, Seokha, Seungsik Moon, Dongyun Kam, Inn-Yeal Oh, and Youngjoo Lee. "High-Throughput and Low-Latency Digital Baseband Architecture for Energy-Efficient Wireless VR Systems." Electronics 8, no. 7 (July 22, 2019): 815. http://dx.doi.org/10.3390/electronics8070815.
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This paper presents a novel baseband architecture that supports high-speed wireless VR solutions using 60 GHz RF circuits. Based on the experimental observations by our previous 60 GHz transceiver circuits, the efficient baseband architecture is proposed to enhance the quality of transmission. To achieve a zero-latency transmission, we define an (106,920, 95,040) interleaved-BCH error-correction code (ECC), which removes iterative processing steps in the previous LDPC ECC standardized for the near-field wireless communication. Introducing the block-level interleaving, the proposed baseband processing successfully scatters the existing burst errors to the small-sized component codes, and recovers up to 1080 consecutive bit errors in a data frame of 106,920 bits. To support the high-speed wireless VR system, we also design the massive-parallel BCH encoder and decoder, which is tightly connected to the block-level interleaver and de-interleaver. Including the high-speed analog interfaces for the external devices, the proposed baseband architecture is designed in 65 nm CMOS, supporting a data rate of up to 12.8 Gbps. Experimental results show that the proposed wireless VR solution can transfer up to 4 K high-resolution video streams without using time-consuming compression and decompression, successfully achieving a transfer latency of 1 ms.
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Kotlyar, Victor V., Alexey A. Kovalev, Elena S. Kozlova, and Alexandra A. Savelyeva. "Tailoring the Topological Charge of a Superposition of Identical Parallel Laguerre–Gaussian Beams." Micromachines 13, no. 12 (December 15, 2022): 2227. http://dx.doi.org/10.3390/mi13122227.
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In optical computing machines, data can be transmitted by optical vortices, and the information can be encoded by their topological charges. Thus, some optical mechanisms are needed for performing simple arithmetic operations with the topological charges. Here, a superposition of several parallel identical Laguerre–Gaussian beams with single rings is studied. It is analytically and numerically shown that if the weighting coefficients of the superposition are real, then the total topological charge of the superposition is equal to the topological charge of each component in the initial plane and in the far field. We prove that the total topological charge of the superposition can be changed by the phase delay between the beams. In the numerical simulation, we demonstrate the incrementing and decrementing the topological charge. Potential application areas are in optical computing machines and optical data transmission.
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Bukvisova, Zuzana, Jaroslava Orsagova, David Topolanek, and Petr Toman. "Two-Terminal Algorithm Analysis for Unsymmetrical Fault Location on 110 kV Lines." Energies 12, no. 7 (March 27, 2019): 1193. http://dx.doi.org/10.3390/en12071193.
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This work analyses a two-terminal algorithm designed to locate unsymmetrical faults on 110 kV power transmission lines. The algorithm processes synchronized voltage and current data obtained from both ends of the protected transmission line and calculates the distance of the fault. It is based on decomposing the equivalent circuit into the positive-, negative- and zero-sequence components and finding the point where the output voltages of the right and the left side of the transmission line are equal. Compared to the conventional distance relay locator, the accuracy of this method is higher and less influenced by the fault resistance, the parallel-operated line effect and line asymmetry, as discussed in this work. It is, however, very sensitive to the synchronization accuracy. The mathematical model of the power system was created in the PSCAD (Power Systems Computer Aided Design) environment and the computational algorithm was implemented in Mathematica software.
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Iqbal, Zahid, Fei Ji, and Yun Liu. "Virtual Spatial Channel Number and Index Modulation." Wireless Communications and Mobile Computing 2021 (September 11, 2021): 1–10. http://dx.doi.org/10.1155/2021/2982226.
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This paper proposes a novel precoding-aided and efficient data transmission scheme called virtual spatial channel number and index modulation (VS-CNIM), which conveys extra data by changing both the number and index of active virtual parallel channels of multiple-input multiple-output (MIMO) channels, obtained through the singular value decomposition (SVD) in each time slot. Unlike the conventional virtual spatial modulation (VSM), where extra data bits are transmitted only using index of active virtual parallel channels, the VS-CNIM scheme, depending on incoming information bits, transmits extra bits utilizing both the number and indices of active parallel channels along the bits carried by M -ary constellation symbols. Therefore, VS-CNIM provides significantly superior spectral efficiency (SE) compared to VSM. Considering the influence of imperfect channel estimation, a closed-form upper bound is derived on average bit error probability (ABEP). The asymptotic performance is also analyzed, which gives the coding gain and diversity order and describes error floor under the consideration of perfect and imperfect channel estimation, respectively. Monte Carlo simulations exhibit that the VS-CNIM scheme achieves considerably better error performance and high SE than precoding-aided SM (PSM) and VSM schemes.
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Lei, Gang, Lejun Ji, Ruiwen Ji, Yuanlong Cao, Xun Shao, and Xin Huang. "Extracting Low-Rate DDoS Attack Characteristics: The Case of Multipath TCP-Based Communication Networks." Wireless Communications and Mobile Computing 2021 (July 7, 2021): 1–10. http://dx.doi.org/10.1155/2021/2264187.
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The multipath TCP (MPTCP) enables multihomed mobile devices to realize multipath parallel transmission, which greatly improves the transmission performance of the mobile communication network. With the rapid development of all kinds of emerging technologies, network attacks have shown a trend of development with many types and rapid updates. Among them, low-rate distributed denial of service (LDDoS) attacks are considered to be one of the most threatening issues in the field of network security. In view of the current research status, by using the network simulation software NS2, this paper first compares and analyzes the throughput and delay performance of the MPTCP transmission system under LDDoS attacks and, further, conducts simulation experiments and analysis on the queue occupancy rate of the LDDoS attack flow to extract the basic attack characteristics of the LDDoS attacks. The experimental results show that the LDDoS attacks will have a major destructive effect on the throughput performance and delay performance of the MPTCP transmission system, resulting in a decrease in the robustness of the transmission system. By analyzing and comparing the occupancy rate of the LDDoS attack flow in the MPTCP transmission system, it can be concluded that (1) the occupancy rate of the LDDoS scattered pulse traffic sent by each puppet machine changes slightly, and (2) the occupancy rate of LDDoS attack data flow is much greater than that of ordinary TCP data flow.
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Zhong, Ran, Qianying Zhang, and Yachao Zhao. "Research on Enterprise Financial Accounting Information Security Model Based on Big Data." Wireless Communications and Mobile Computing 2022 (May 12, 2022): 1–10. http://dx.doi.org/10.1155/2022/7929846.
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Powered by the rapid development of the information age, big data technology has had a great impact on China’s socialist economic development. Big data technology is integrated into all fields of nowadays society, especially in the accounting industry of enterprises. Accounting computerization quickly replaces the traditional manual bookkeeping, realizes the timeliness and accuracy of accounting information data processing, and improves the work efficiency and quality of accounting staff to a great extent, but at the same time, the security of financial accounting information is also very prominent. To tackle this problem, this paper proposes a hybrid encryption algorithm based on double chaotic system and improved AES encryption algorithm. The improved AES algorithm uses affine transformation pairs (A7 and 6F) to generate new S-boxes. The double four-dimensional hyperchaotic system is transformed from two three-dimensional chaotic systems, and then, the transformed hyperchaotic system is used to generate chaotic sequences, and a block encryption scheme is designed. On Hadoop big data platform, double hyperchaotic encryption scheme and improved AES algorithm are combined. Simulation test results show that this method can safely transmit enterprise financial accounting information data packets. With the increase of computing cluster nodes, its encryption transmission efficiency continues to improve. This scheme not only solves the problem of enterprise financial accounting data security encryption but also realizes the parallel transmission of encrypted data in the information age, forming a double guarantee of data transmission security and efficiency.
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Pushkarev, Alexander V., and Sergei N. Novikov. "STUDY OF METHODS FOR ENSURING INFORMATION INTEGRITY IN INFORMATION SYSTEMS WITH OPTICAL COMMUNICATION CHANNELS." Interexpo GEO-Siberia 6, no. 2 (July 8, 2020): 66–71. http://dx.doi.org/10.33764/2618-981x-2020-6-2-66-71.
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The relevance of the work lies in the fact that the number of information systems with optical communication channels is increasing. However, for such systems, the optimal method for ensuring the integrity of information has not been identified. The purpose of the work is to identify the best method for ensuring the integrity of information in information systems with optical communication channels. This article discusses methods for ensuring the integrity of information at the stages of storage and transmission of information. The main method for ensuring the integrity of information at the storage stage is the data backup method. Parallel information transfer is the main method at the stage of information transfer. As a result of the study, the following conclusion was made: to ensure maximum security of information integrity, it is necessary to apply an integrated approach and use immediately both data backup and protection methods at the stage of information transfer.
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Bao, Wenxia, Yangxun Ren, Nian Wang, Gensheng Hu, and Xianjun Yang. "Detection of Abnormal Vibration Dampers on Transmission Lines in UAV Remote Sensing Images with PMA-YOLO." Remote Sensing 13, no. 20 (October 15, 2021): 4134. http://dx.doi.org/10.3390/rs13204134.
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The accurate detection and timely replacement of abnormal vibration dampers on transmission lines are critical for the safe and stable operation of power systems. Recently, unmanned aerial vehicles (UAVs) have become widely used to inspect transmission lines. In this paper, we constructed a data set of abnormal vibration dampers (DAVDs) on transmission lines in images obtained by UAVs. There are four types of vibration dampers in this data set, and each vibration damper may be rusty, defective, or normal. The challenges in the detection of abnormal vibration dampers on transmission lines in the images captured by UAVs were as following: the images had a high resolution as well as the objects of vibration dampers were relatively small and sparsely distributed, and the backgrounds of cross stage partial networks of the images were complex due to the fact that the transmission lines were erected in a variety of outdoor environments. Existing methods of ground-based object detection significantly reduced the accuracy when dealing with complex backgrounds and small objects of abnormal vibration dampers detection. To address these issues, we proposed an end-to-end parallel mixed attention You Only Look Once (PMA-YOLO) network to improve the detection performance for abnormal vibration dampers. The parallel mixed attention (PMA) module was introduced and integrated into the YOLOv4 network. This module combines a channel attention block and a spatial attention block, and the convolution results of the input feature maps in parallel, allowing the network to pay more attention to critical regions of abnormal vibration dampers in complex background images. Meanwhile, in view of the problem that abnormal vibration dampers are prone to missing detections, we analyzed the scale and ratio of the ground truth boxes and used the K-means algorithm to re-cluster new anchors for abnormal vibration dampers in images. In addition, we introduced a multi-stage transfer learning strategy to improve the efficiency of the original training method and prevent overfitting by the network. The experimental results showed that the mAP@0.5 for PMA-YOLO in the detection of abnormal vibration dampers reached 93.8% on the test set of DAVD, 3.5% higher than that of YOLOv4. When the multi-stage transfer learning strategy was used, the mAP@0.5 was improved by a further 0.2%.
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Rabe, H., D. Kornek, M. Stege, and I. Rolfes. "MIMO performance of a planar logarithmically periodic antenna with respect to measured channel matrices." Advances in Radio Science 6 (May 26, 2008): 55–61. http://dx.doi.org/10.5194/ars-6-55-2008.
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Abstract. The increasing interest in wireless transmission of highest data rates for multimedia applications (e.g. HDTV) demands the use of communication systems as e.g. described in the IEEE 802.11n draft specification for WLAN including spatial multiplexing or transmit diversity to achieve a constant high data rate and a small outage probability. In a wireless communications system the transmission of parallel data stream leads to multiple input/multiple output (MIMO) systems, whose key parameters heavily depend on the properties of the mobile channel. Assuming an uncorrelated channel matrix the correlation between the multiplexed data streams is caused by the coupling of the antennas, so that the radiation element becomes an even more important part of the system. Previous work in this research area (Klemp and Eul, 2006) has shown that planar log.-per four arm antennas are promising candidates for MIMO applications providing two nearly decorrelated radiators, which cover a wide frequency range including both WLAN bands at 2.4 GHz and 5.4 GHz. Up to now the MIMO performance of this antenna is mainly analyzed by simulations. In this contribution measured channel matrices in a real office environment are studied in terms of the antenna's MIMO performance such as outage probability. The obtained results recorded by using a commercial platform are compared to the simulated ones.
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Bustamante, Andrés, Lidia M. Belmonte, Rafael Morales, António Pereira, and Antonio Fernández-Caballero. "Video Processing from a Virtual Unmanned Aerial Vehicle: Comparing Two Approaches to Using OpenCV in Unity." Applied Sciences 12, no. 12 (June 11, 2022): 5958. http://dx.doi.org/10.3390/app12125958.
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Virtual reality (VR) simulators enable the evaluation of engineering systems and robotic solutions in safe and realistic environments. To do so, VR simulators must run algorithms in real time to accurately recreate the expected behaviour of real-life processes. This work was aimed at determining a suitable configuration for processing images taken from a virtual unmanned aerial vehicle developed in Unity using OpenCV. To this end, it was focused on comparing two approaches to integrate video processing in order to avoid potential pitfalls such as delays and bottlenecks. The first approach used a dynamic link library (DLL) programmed in C++, and the second an external module programmed in Python. The native DLL ran internally on the same Unity thread, as opposed to the Python module that ran in parallel to the main process and communicated with Unity through the Message Queue Telemetry Transport (MQTT) protocol. Pre-transmission processing, data transmission and video processing were evaluated for a pair of typical image-processing tasks like colour and face detection. The analysis confirmed that running the Python module in parallel does not overload the main Unity thread and achieves better performance than the C++ plugin in real-time simulation.
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Denisov, V. A. ,., and L. V. Chuprina. "Technological conditions synchronous operation of united power system of Ukraine and neighboring ENTSO-E-member power systems." Problems of General Energy 2021, no. 3 (September 23, 2021): 53–62. http://dx.doi.org/10.15407/pge2021.03.053.
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A large-scale reform of relations in the electricity sector, which has been taking place in recent years in Ukraine, is explained by the desire of integration into European Union, and these prescripts, in particular, by the Law of Ukraine “On ratification of the Association Agreement between Ukraine and the European Union”. One of the important steps towards Ukraine's integration into the EU is the accession of the United Power System (UPS) to the Association of Transmission System Operators of Continental Europe (ENTSO-E) for which, in particular, in July 2019, a new electricity market model was introduced in Ukraine, built on principles compatible with the EU, currently functioning in accordance with the provisions of the Law of Ukraine "On the Electricity Market of Ukraine" and by-laws, in particular, "Market Rules", "Market rules" for the day ahead and intraday market ". The conditions of parallel operation of the UPS of Ukraine with the energy systems of neighboring countries that are part of ENTSO-E are considered, in particular, the structure of generating capacities, characteristic graphs of electrical loads, the presence and capacity of interstate power transmission lines and the value of the maximum allowable import and export capacity. The data presented can be used as input information for modeling the operating modes of the generating capacities of individual power systems, ensuring the readiness to integrate the power system of Ukraine with the power system of Continental Europe ENTSO-E and serve as the basis for modeling the synchronous functioning of the UPS of Ukraine in parallel operation with the power systems of neighboring countries. Keywords: energy system, ENTSO-E, technological conditions
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He, Yigen, Xuesen Shi, and Yongqing Wang. "A Modified LZW Algorithm Based on a Character String Parallel Search in Cluster-Based Telemetry Data Compression." Electronics 11, no. 17 (August 25, 2022): 2656. http://dx.doi.org/10.3390/electronics11172656.
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The volume of telemetry data is gradually increasing, both because of the increasingly larger number of parameters involved, and the use of higher sampling frequencies. Efficient data compression schemes are therefore needed in space telemetry systems to improve transmission efficiency and reduce the burden of required spacecraft resources, in particular regarding their transmitter power. In our primary study, a D-CLU algorithm was proposed to perform lossless compression for telemetry data, and achieve better performance. However, a limitation of this algorithm is that the compression time may become longer when the clustering head (CH) and outlier (which are compressed by LZW algorithm) numbers increase. To reduce compression delay, this paper proposed a modified character string (MCS) parallel search strategy for LZW algorithm (denoted by MCS-based LZW). The proposed MCS-based LZW algorithm designs coding principle, dictionary update rule and search strategy according to the character string matching results. Example verification and simulation results show that the proposed algorithm can effectively decrease the dictionary search times, and thus reduce the compression time.