Zeitschriftenartikel: „Wireless Radio Channel“

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Dai, Yuan-Kao, Li-Hsing Yen und Jia-Wei Su. „Toward an Access Infrastructure for Mobile Cloud“. International Journal of Grid and High Performance Computing 5, Nr. 3 (Juli 2013): 6–19. http://dx.doi.org/10.4018/jghpc.2013070102.

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The provision of mobile cloud service calls for a wireless access infrastructure that offers high bandwidth to mobile users. Among all enabling technologies, wireless mesh networks (WMNs) have the advantage of low deployment cost and widely available user equipments. To provide more bandwidth, access points in WMNs are commonly equipped with multiple wireless interfaces (radios) that can operate on multiple non-overlapping channels in parallel. The objective of channel assignments in a multi-channel, multi-radio MWN is to reduce co-channel interference experienced by links so as to increase network capacity while maintaining network connectivity. Prior studies addressing this issue majorly considered effects of co-channel interference at the link layer. In this study, the authors consider co-channel interference at the physical layer. Furthermore, most existing methods are based on heuristic or game theory. This study applies simulated annealing technique to the channel allocation problem. The objective function for this approach is defined as the total signal-to-interference radio (SIR) experienced by each link. To maintain network connectivity, the proposed approach limits the set of assigned channels for each radio. Experimental results show that, compared with traditional heuristic-based and game-theoretic approaches, the proposed simulated annealing algorithm results in more operative links.

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Heider, Inaam Abbas. „Improvement of Fading Channel Modeling Performance for Wireless Channel“. International Journal of Electrical and Computer Engineering (IJECE) 8, Nr. 3 (01.06.2018): 1451. http://dx.doi.org/10.11591/ijece.v8i3.pp1451-1459.

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Fading channel modeling is generally defined as the variation of the attenuation of a signal with various variables. Time, geographical position, and radio frequency which is included. Fading is often modeled as a random process. Thus, a fading channel is a communication channel that experiences fading. In this paper, the proposed system presents a new design and simulate a wireless channel using Rayleigh channels. Rayleigh channels using two approaches (flat and frequency-selective fading channels) in order to calculate some path space loss efforts and analysis the performance of different wireless fading channel modeling. The results show that the bite error rate (BER) performance is dramatically improved in the value of signal to noise ratio (SNR) is equal to 45dB. Finally, the experimental results show that the proposed method enhances the performance of fading channel modeling by reducing the error of BER when the SNR is reduced also. Moreover, the more accurate model is Rayleigh model which can be considered for developing fading channel model.

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Ning, Zhao Long, Yu Huai Peng und Lei Guo. „Performance Comparison for Routing Protocols in Multi-Radio Multi-Channel Multi-Hop Wireless Networks“. Advanced Materials Research 433-440 (Januar 2012): 5107–12. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.5107.

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In this paper, we consider a TDMA-based wireless network and address two major issues, fading and interference, existing in wireless networks since fading will lead to low quality links and interference may lead to unfair channel allocation. Because channel allocation selects the proper channel for each logical link and routing determines through which logical links the packets should be forwarded, there is strong interaction between MAC layer and network layer. In this paper, we seek for the performance trend with more channels allocated and further compare the performances of Bellman-Ford and AODV routing protocols based on the Packet Deliver Rate (PDR) to MAC layer in multi-radio multi-channel multi-hop wireless networks. Numerical results are given and discussions as well as insights into performance aspects for multi-radio multi-channel deployment are provided.

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Skvarnik, I. S., A. A. Shmakov, A. N. Shentyabin und I. V. Minin. „AUTOMATIC DEVICE FOR REAL–TIME SWITCHING TO RESERVE RADIO CHANNEL“. Issues of radio electronics, Nr. 5 (08.06.2019): 39–47. http://dx.doi.org/10.21778/2218-5453-2019-5-39-47.

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Guaranteed delivery of information via communication channels remains an urgent task for a number of industries. However, automatic transition to the reserve for analog communication channels requires non‑standard solutions. In the proposed device, the decision on switching to the reserve is made on the basis of spectral analysis of signals transmitted via the main and backup communication channels. A wired communication channel is considered as the main channel, and a wireless broadband access channel is used as a backup channel. The signal transmitted over the wireless broadband access is taken as a reference because it is of high quality and which we can influence when building a network. The spectrum of analog signals is calculated on the basis of the fast Fourier transform, the implementation of which is carried out in the analog signal block based on the STM‑32 microcontroller. The device provides a transition to the reserve in real time.

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Yang, Yong, Yu Liang Li und Jing Li. „Radio Channel Research in Coal Mine Laneways“. Advanced Materials Research 605-607 (Dezember 2012): 2222–26. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.2222.

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The transmission mode of wireless waves in coal mine tunnel is different from the mode in free space.The multipath propagation of wireless wave is severe in tunnel.As a result,the characteristics study of multipath propagation is very important to the design of wireless communication system in coal mine tunnel.After analyzing the multipath propagation attenuation in tunnel,the statistics of single frequency signal,narrowband signal and broadband signal are obtained.This is the foundation for the application of resisting multipath decline techniques.

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Kim, Tae-Sung, Sok-Hyong Kim, Bo-Kyum Kim und Young-Yong Kim. „Exploiting Multiple Channels for Low Latency and Semireliable Broadcasting in Cognitive Wireless Sensor Networks“. International Journal of Distributed Sensor Networks 2015 (2015): 1–16. http://dx.doi.org/10.1155/2015/241208.

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In Wireless Sensor Networks (WSNs), disaster management is a crucial issue that focuses on disaster relief and recovery. Mobile sensor nodes support disaster relief and recovery by means of real-time bidirectional communication. For its high data rate requirement, IEEE 802.11 specification can be used for the radio interface of sensor nodes, and the nodes can be equipped with multiple 802.11 radios to utilize multiple channels and link data rates. Channel assignment algorithms can be applied in cognitive radio enabled networks which performs dynamic channel configuration for utilizing multiple channels. For efficient and semireliable broadcast in cognitive radio WSNs, we focus on reducing broadcast latency and achieving 100% delivery percentage. To realize these goals, in this study, we present our design for a novelChannel Assignment Algorithm for a Collision-Reduced Broadcast Tree(CA-CBT). Fundamentally, CA-CBT builds a broadcast tree and then uses several heuristic procedures to allocate collision-free channels to links on the tree. If CA-CBT fails to allocate collision-free channels due to a limited number of available channels, it allocates non-collision-free channels with the smallest number of interfering nodes. Through extensive simulations, we demonstrated that CA-CBT supports lower broadcast latency and higher delivery percentages compared with existing broadcast algorithms.

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A. Rida, Jafaar Fahad. „Improvement for performance radio frequency in wireless communication based on impulse signal“. Indonesian Journal of Electrical Engineering and Computer Science 18, Nr. 2 (01.05.2020): 903. http://dx.doi.org/10.11591/ijeecs.v18.i2.pp903-916.

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This research presents the improved performance of mobile wireless communication channel is based on non-line of sight because the mobile propagation channel is very hard to work with direct path between the transmitter and mobile receiver because of city-based area has objects such as rise building, trees, surround structures, and other objects. The mobile wireless spread radio channels have radio propagation mechanisms as a reflection, diffraction, and scattering effect on radio signal as lessening, and distortion or spread time. The most important thing to make real is that the wireless channel is a multipath radio channel. Multipath copies of the same signal with distinct amplitudes, stages and delay times for all multipaths between the transmitter and the receiver. The multipath fading is defined by its impulse response, which includes the facts about the relative time of the recipient's arrival of various indices of multipath additives. The impulse response expresses great characteristics in the time domain such the large bandwidth frequencies and the amplitude output only the value impulse response δ(t) equal to one when the value of time t=0, otherwise, the value impulse response δ(t) equal to zero in all values of the time. Over a time period reaction, the cellular radio channel could be designed as a linear filter with various impulses.

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Khan, Mohammad Monirujjaman, Qammer H. Abbasi, Akram Alomainy und Yang Hao. „Performance of Ultrawideband Wireless Tags for On-Body Radio Channel Characterisation“. International Journal of Antennas and Propagation 2012 (2012): 1–10. http://dx.doi.org/10.1155/2012/232564.

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Experimental characterisation of on-body radio channel for ultrawideband (UWB) wireless active tags is reported in this paper. The aim of this study is to investigate the performance of the commercially available wireless tags on the UWB on-body radio channel characterisation. Measurement campaigns are performed in the chamber and in an indoor environment. Statistical path loss parameters of nine different on-body radio channels for static and dynamic cases are shown and analyzed. Results demonstrated that lognormal distribution provides the best fits for on-body propagation channels path loss model. The path loss was modeled as a function of distance for 34 different receiver locations for propagation along the front part of the body. A reduction of 11.46% path loss exponent is noticed in case of indoor environment as compared to anechoic chamber. In addition, path loss exponent is also extracted for different body parts (trunk, arms, and legs). Second-order channel parameters as fade probability (FP), level crossing rate (LCR), and average fade duration (AFD) are also investigated.

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Wu, Chien-Min, Yen-Chun Kao und Kai-Fu Chang. „A Multichannel MAC Protocol for IoT-enabled Cognitive Radio Ad Hoc Networks“. Advances in Technology Innovation 5, Nr. 1 (01.01.2020): 45–55. http://dx.doi.org/10.46604/aiti.2020.3946.

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Cognitive radios have the ability to dynamically sense and access the wireless spectrum, and this ability is a key factor in successfully building Internet-of-Things (IoT)-enabled mobile ad hoc networks. This paper proposes a contention-free token-based multichannel MAC protocol for IoT-enabled Cognitive Radio Ad Hoc Networks (CRAHNs). In this, secondary users of CRAHNs detect activity on the wireless spectrum and then access idle channels licensed by primary users. CRAHNs are divided into clusters, and the channel to use for transmission is determined dynamically from the probability of finding idle primary-user channels. The token-based MAC window size is adaptive, with adjustment according to actual traffic, which reduces both end-to-end MAC contention delay and energy consumption. High throughput and spatial reuse of channels can also be achieved using a dynamic control channel and dynamic schemes for contention windows. We performed extensive simulations to verify that the proposed method can achieve better performance in mobile CRAHNs than other MAC schemes can.

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Bo, Ai, Thomas Kürner, César Briso Rodríguez und Hsiao-Chun Wu. „Radio Wave Propagation and Wireless Channel Modeling“. International Journal of Antennas and Propagation 2013 (2013): 1–3. http://dx.doi.org/10.1155/2013/835160.

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Loganathan, Jayakumar, S. Janakiraman und Ankur Dumka. „Optimal Spectrum-Hole Detection Scheme for Cooperative CRN Using Dynamic Weighted VIKOR“. International Journal of Enterprise Information Systems 16, Nr. 1 (Januar 2020): 108–31. http://dx.doi.org/10.4018/ijeis.2020010106.

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In the future, the wireless network environment may suffer due to the unavailability of new spectrum bands. Cognitive radio research considers the current spectrum underutilization and provides a better model for the next-generation wireless environment. Since the implementation of the cognitive radio and its policies is a bigger challenge under static spectrum allocation, i.e., current wireless networks policy, many issues are in front of us to accomplish a better cognitive radio wireless environment. One of the major challenges is a secure transmission and efficient free channel selection. In this research, the authors considered an efficient free-channel selection scheme as objective and derived an integrated approach for free-channel selection with techniques, Dynamic weighted-VIKOR.

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Düngen, Monique, Thomas Hansen, Ramona Croonenbroeck, Rüdiger Kays, Bernd Holfeld, Dennis Wieruch, Pablo Wilke Berenguer et al. „Channel measurement campaigns for wireless industrial automation“. at - Automatisierungstechnik 67, Nr. 1 (28.01.2019): 7–28. http://dx.doi.org/10.1515/auto-2018-0052.

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Abstract The factories of the future will be highly digitalized in order to enable flexible and interconnected manufacturing processes. Especially wireless technologies will be beneficial for industrial automation. However, the high density of metallic objects is challenging for wireless systems due to multipath fading. In order to understand the signal propagation in industrial environments, this paper provides results from a number of channel measurement campaigns funded by the German research initiative “Reliable wireless communication in the industry”. We give an overview of different measurement scenarios covering visible light communication and radio communication below 6 GHz. We analyze large and small scale parameters as well as delay statistics of the wireless channels. Finally, we discuss the importance of the results for the definition of industrial channel models.

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Lala, Nisar A., G. M. Mir, Altaf A. Balkhi und N. A. Sofi. „Fuzzy Rule based Quality of Service Provisioning in Cognitive Radio Network“. Oriental journal of computer science and technology 11, Nr. 1 (20.03.2018): 55–63. http://dx.doi.org/10.13005/ojcst11.01.10.

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Cognitive radio (CR) is a novel technology to resolve the issue of under-utilization of wireless spectrum. Quality of service (QoS) provisioning in CR networks to large number of traffic as per their need is not an easy task since no wireless spectrum is available on permanent basis for its operation. In this paper, few critical QoS parameters namely dynamic-availability-of-idle-channels (avail-idle-channel), expected-holding-time-of-idle-channel (HT-idle-channel) and user-mobility are chosen to analyze their impact over quality of service of the communicating cognitive users using rule-based fuzzy decision-making system. The results indicate the relationship of chosen parameters over the QoS of the communicating cognitive users.

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Agarkhed, Jayashree, und Veeranna Gatate. „ICBCA – Improved Cluster Based Channel Allocation in Cognitive Radio Sensor Networks“. Journal of Telecommunications and Information Technology 3 (30.09.2020): 28–35. http://dx.doi.org/10.26636/jtit.2020.139820.

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Wireless sensor networks (WSNs) operate in an overcrowded electromagnetic environment, as the spectrum is shared by various wireless communication technologies. This gives rise to various challenges related to optimized and eﬃcient spectrum utilization. Cognitive radio (CR) has emerged as a solution satisfying this requirement, as it is capable of adapting to the dynamic radio spectrum. Thanks to the deployment of cognitive radio in WSNs, the spectrum may be utilized in a more eﬃcient manner. CR may identify the vacant channels dynamically, allowing the sensor nodes to eﬀectively communicate with each other. In this paper a clustering algorithm known as improved cluster-based channel assignment (ICBCA) is implemented, forming clusters of CR sensor nodes and then selecting vacant channels for data transmission purposes. Simulation results show that ICBCA outperforms existing clustering algorithms in CR sensor networks

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Ren, Jin. „Performance of HD Radio System“. Applied Mechanics and Materials 678 (Oktober 2014): 477–81. http://dx.doi.org/10.4028/www.scientific.net/amm.678.477.

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The advance of wireless communications brings in various schemes of wireless digital communication technology. Analog communication and broadcasting services convert into digital services in many countries. The IBOC (In-Band On-Channel) system has been developed to work in the same band with the conventional analog radio and broadcasting digital signal simultaneously. HDR (HD-Radio) standard of IBOC (In-Band-On-Channel) can use coherent demodulation using pilot sub-carriers. In this paper, the performance of HD radio system is evaluated. To contribute to decision of digital radio standard and design of digital radio transmission network, the simulation results will give a help.

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Rai, Prativa, Mrinal Kanti Ghose und Hiren Kumar Deva Sarma. „Design of utility functions for game-based channel allocation in cognitive radio wireless sensor network“. Indonesian Journal of Electrical Engineering and Computer Science 22, Nr. 2 (01.05.2021): 1013. http://dx.doi.org/10.11591/ijeecs.v22.i2.pp1013-1023.

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Cognitive radio enabled wireless sensor network is capable of reducing the spectrum scarcity problem of the wireless networks. Looking at the scarcity of available bandwidth, and the high growth in the number of communication devices in recent times, cognitive radio technology has proven to be a promising technology for the days to come. The application of Game Theory in cognitive radio networks has been visible in recent research works. However, only limited literature is available in which possibilities of applying the game-theory based approaches for the challenging task of channel assignment in cognitive radio wireless sensor are available in the literature. It is understood that the crux of the solution to the problem of scheming games for allocation of the channel is centered on the selection of the utility function in order to increase the efficiency of the channel allocation algorithm. Accordingly, the study regarding the influence of several utility functions on the performance of the corresponding channel allocation algorithm is important. Such a study enables designers to arrive at the optimal utility function to be used in game-theory based channel allocation algorithms, and the same is explored to the best extent, in this paper. The detailed procedure of allocating channels to all the contending nodes through game-based channel allocation has been discussed in this paper. Moreover, the performance of six different utility functions proposed which can be used for channel allocation using game theory has been evaluated for respective performances through MATLAB-based simulations.

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Mihnea, Amalya, und Mihaela Cardei. „Efficient Wireless Communication in Grid Networks“. International Journal of Interdisciplinary Telecommunications and Networking 7, Nr. 3 (Juli 2015): 57–79. http://dx.doi.org/10.4018/ijitn.2015070105.

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The authors give lower and upper bounds for capacity in grid networks when using one channel and one radio per node. We also analyze the capacity for multiple channels and make connections to channel assignment algorithms that we introduced previously, which are robust to the presence of primary users. The bounds obtained depend on the range of communication, the distance between nodes and the size of the grid network. Using our communication pattern, node communication can be scheduled to ensure end-to-end communication between any two nodes in a grid network while maximizing capacity.

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Li, Mingming, Jiaru Lin, Fazhong Liu, Dongxu Wang und Li Guo. „Cognitive MIMO Radio“. International Journal of Cognitive Informatics and Natural Intelligence 5, Nr. 2 (April 2011): 58–79. http://dx.doi.org/10.4018/jcini.2011040104.

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The authors consider a cognitive radio network in which a set of cognitive users make opportunistic spectrum access to one primary channel by time-division multiplexing technologies. Multiple Input Multiple Output techniques (MIMO) are similarly considered to enhance the stable throughput for cognitive links while they should guarantee co-channel interference constraints to the primary link. Here, two different cases are considered: one is that cognitive radio network is distributed; the other is centrally-controlled that cognitive radio network has a cognitive base station. In the first case, how to choose one fixed cognitive user and power control for each transmission antenna at the cognitive base station are considered to maximize the cognitive link’s stable throughput. In the second case, a scheme to choose a group of cognitive users and a Zero-Forcing method to pre-white co-channel interference to the primary user, are also proposed in order to maximize cognitive base station’s sum-rate. The algorithm can be employed to realize opportunistic spectrum transmission over the wireless fading channels.

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Kalistatov, Kalistratov Dmitry. „Wireless Video Monitoring of the Megacities Transport Infrastructure“. Civil Engineering Journal 5, Nr. 5 (22.05.2019): 1033–40. http://dx.doi.org/10.28991/cej-2019-03091309.

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The article discusses the development of megacities transport infrastructure. The problem of traffic congestion is touched upon, the task of optimal road design is justified. In the context of these issues gives a system of wireless video monitoring of traffic flows on base of digital panoramic video images. The main objective is to obtain a universal mathematical model for the description of a radio signal with any type of digital modulation. This will greatly facilitate the parametric calculation of the radio channel for image transmission and the design of the monitoring system. The objective is achieved by applying the Fourier method of separation of variables in combination with computer simulation methods. As result, a highly accurate universal mathematical model of radio signal with digital modulation is proposed. The scientific novelty of the model is that it allows to simulate the propagation of a radio signal with an arbitrary waveform. Thanks to this, the model covers almost all common types of digital modulation of the radio signal. In addition, the model takes into account the internal noise of the equipment and the external interference of the radio channel. The article describes in detail the process of solving the wave equation, underlying the model. Examples of modeling are given, the advantages and disadvantages of the model are indicated. Recommendations are made on its use for calculating radio channels and designing systems for analyzing and developing the transport infrastructure of a megacity.

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Pushpa Latha, S., und R. Sabitha. „New Analytical Channel Allocation Methodology for Multichannel Multi-Radio Wireless Networks“. Journal of Computational and Theoretical Nanoscience 17, Nr. 5 (01.05.2020): 2396–401. http://dx.doi.org/10.1166/jctn.2020.8902.

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In wireless technologies, jamming attack is a main Research problem in multichannel multi-radio as they block communication in wireless networks. Malicious nodes block legitimate communication through jamming attacks that causes intentional interference. This paper presents the problem of jamming attack in multichannel multi-radio wireless network. First, Allocated the channel in Randomized manner and measure the Entropy rate. Second, defined the channel capacity. Third determined noiseless channel. Furthermore, Find the responses from channel and compare Response channel (H(S/R)) with Noise less channel (T). If H(S/R) ∈ T, Then to select the channel otherwise to reject the channel and assign (H(S/R)) = Attack. Finally, Based on the jammer detection algorithm, the result is compared with cyclic spectral analysis. But the proposed algorithm computation process is very simple than cyclic spectral analysis algorithm and Cyclostationary.Based jammer Detection Algorithm.

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Thavaselan, Gopinathan, und Ranganathan Rani Hemamalini. „Performance Analysis of Coded Reception in Multipath Fading Channels with Wavelet Packet Based OFDM Transmission“. Applied Mechanics and Materials 573 (Juni 2014): 400–406. http://dx.doi.org/10.4028/www.scientific.net/amm.573.400.

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Abstract. Radio propagation on wireless channels depends on many static and dynamic factors like, buildings, trees, mountains, frequency of operation, velocity of mobile stations and interfering sources. Mathematical models for channel are considered for various communication functions like, predicting radio coverage, estimation of interferences from various sources, estimating the characteristics of an alternate transmitter and receiver, achievable data rates and for determining the location for wireless infrastructure. Signal propagation in fading channels cause degradation of signal QoS. OFDM is often used to mitigate fading effects in wireless channels; the paper describes the disadvantage of OFDM and provides a wavelet based solution to surmount it. The paper also investigates the BER vs. SNR performance of modified OFDM using wavelet packet in Rayleigh and Rician Channels and the results are compared with conventional OFDM.

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Ai, Bo, Thomas Kürner, César Briso Rodríguez und Hsiao-Chun Wu. „Radio Wave Propagation and Wireless Channel Modeling 2013“. International Journal of Antennas and Propagation 2014 (2014): 1–2. http://dx.doi.org/10.1155/2014/670564.

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Bykhovsky, Dima. „Teaching wireless channel modeling with software‐defined radio“. Computer Applications in Engineering Education 28, Nr. 2 (18.01.2020): 314–23. http://dx.doi.org/10.1002/cae.22195.

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GUAN, Jun-ming, Yang LU, Feng SHENG und Mei FANG. „Survey of channel assignment for multi-radio multi-channel wireless networks“. Journal of Computer Applications 29, Nr. 5 (23.07.2009): 1233–37. http://dx.doi.org/10.3724/sp.j.1087.2009.01233.

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Hassan, Walaa, und Tamer Farag. „Adaptive Allocation Algorithm for Multi-Radio Multi-Channel Wireless Mesh Networks“. Future Internet 12, Nr. 8 (29.07.2020): 127. http://dx.doi.org/10.3390/fi12080127.

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The wireless mesh network (WMN) has proven to be a great choice for network communication technology. WMNs are composed of access points (APs) that are installed and communicate with each other through multi-hop wireless networks. One or more of these APs acts as a gateway (GW) to the internet. Hosts of WMNs are stationary or mobile. According to the structure of WMNs, some network features may be affected, such as the overall performance, channel interference, and AP connectivity. In this paper, we propose a new adaptive channel allocation algorithm for a multi-radio multi-channel wireless mesh network. The algorithm is aimed to minimize the number of channel reassignments while maximizing the performance under practical constraints. The algorithm defines a decision function for the channel reassignments. The decision function aims to minimize the traffic around the GW. Whenever the traffic changes in the wireless mesh network, the decision function decides which channel radio reassignment should be done. We demonstrated the effectiveness of our algorithm through extensive simulations using Network Simulator 2 (NS-2).

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Ren, Jin, und Ting Zhang. „Performance Evaluation of HD Radio System in Radio Environments“. Open Electrical & Electronic Engineering Journal 9, Nr. 1 (31.07.2015): 247–52. http://dx.doi.org/10.2174/1874129001509010247.

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The advance of wireless communications brings in various schemes of wireless digital communication technology. Analog communication and broadcasting services convert into digital services in many countries. The IBOC (In- Band On-Channel) system has been developed to work in the same band with the conventional analog radio and broadcasting digital signal simultaneously. HDR (HD-Radio) standard of IBOC can use coherent demodulation using pilot subcarriers. In this paper, the performance of HD radio system is evaluated. To contribute to decision of digital radio standard and design of digital radio transmission network, the simulation results will give a help.

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Prasad Joshi, Gyanendra, Seung Yeob Nam, Sung Won Kim und Byung-Seo Kim. „Adaptive Window Size-Based Medium Access Control Protocol for Cognitive Radio Wireless Sensor Networks“. Journal of Sensors 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/2049859.

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Many existing medium access control protocols for cognitive radio wireless sensor networks waste bandwidth and suffer from delay because of the fixed channel negotiation period in the common control channel. In this paper, we propose a medium access control protocol for cognitive radio wireless sensor networks that adjusts the channel negotiation period based on network density. We simulate the proposed approach and compare it to the performance of the fixed channel negotiation period based approaches. The results show that the proposed approach efficiently utilizes white spaces and increases the aggregated goodput.

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Mohandass, S., G. Umamaheswari und H. Kowsika. „Wireless Image Transmission Based on Cognitive Radio for Robotic Communication“. Advanced Materials Research 984-985 (Juli 2014): 1370–74. http://dx.doi.org/10.4028/www.scientific.net/amr.984-985.1370.

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Wireless communication plays a vital role in robotic communication. The robots can communicate using any of the wireless standards like Bluetooth, Zigbee, Wi-fi, etc. based on the application. Many applications involve wireless transmission of images from the robots to the access point. The images can be transmitted at a particular frequency based on the wireless standard. However, interference is a major issue in wireless communication. In order to overcome interference and to make use of white space spectrum, cognitive radio is used. Hence in this paper, wireless image transmission based on cognitive radio is proposed for robotic communication. The paper proposes an efficient design of orthogonal frequency division multiplexing (OFDM) based cognitive radio to transmit and receive grayscale images over an AWGN channel. OFDM technologies are particularly well suited to cognitive radio applications because of the ease to which signals can be adapted to channel conditions and capacity requirements. The narrowband interference rejection is facilitated by suitable subcarrier allocation. The whole system has been designed and analyzed using SystemVue software.

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Cao, Zhanmao, Qisong Huang und Chase Wu. „Maximize concurrent data flows in multi-radio multi-channel wireless mesh networks“. Computer Science and Information Systems 17, Nr. 3 (2020): 759–77. http://dx.doi.org/10.2298/csis200216019c.

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Multi-radio multi-channel (MRMC) wireless mesh networks (WMNs) have emerged as the broadband networks to provide access to the Internet for ubiquitous computing with the support for a large number of data flows. Many applications in WMNs can be abstracted as a multi-flow coexistence problem to carry out multiple concurrent data transfers. More specifically, links in different channel layers must be concatenated to compose multiple data transfer paths based on nodes? free interfaces and available channels. This is typically formulated as a combinatorial optimization problem with various stages including channel assignment, path computing, and link scheduling. This paper analyzes traffic behaviors and designs a coexisting algorithm to maximize the number of concurrent data flows. Simulations are conducted in combinatorial cases of channel and radio with various traffic requests of multiple pairs. The experimental results show the efficacy of the coexisting algorithm over a randomly generated topology. This scheme can be used to develop routing and scheduling solutions for various multi-flow network applications through prior computing.

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Zheng, Kan, Suling Ou und Xuefeng Yin. „Massive MIMO Channel Models: A Survey“. International Journal of Antennas and Propagation 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/848071.

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The exponential traffic growth of wireless communication networks gives rise to both the insufficient network capacity and excessive carbon emissions. Massive multiple-input multiple-output (MIMO) can improve the spectrum efficiency (SE) together with the energy efficiency (EE) and has been regarded as a promising technique for the next generation wireless communication networks. Channel model reflects the propagation characteristics of signals in radio environments and is very essential for evaluating the performances of wireless communication systems. The purpose of this paper is to investigate the state of the art in channel models of massive MIMO. First, the antenna array configurations are presented and classified, which directly affect the channel models and system performance. Then, measurement results are given in order to reflect the main properties of massive MIMO channels. Based on these properties, the channel models of massive MIMO are studied with different antenna array configurations, which can be used for both theoretical analysis and practical evaluation.

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Zakaria, Omar M., Aisha-Hassan A. Hashim, Wan H. Hassan, Othman O. Khalifa, M. Azram, Lalitha B. Jivanadham, Mistura L. Sanni und Mahdi Zareei. „Joint Channel Assignment and Routing in Multiradio Multichannel Wireless Mesh Networks: Design Considerations and Approaches“. Journal of Computer Networks and Communications 2016 (2016): 1–24. http://dx.doi.org/10.1155/2016/2769685.

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Multiradio wireless mesh network is a promising architecture that improves the network capacity by exploiting multiple radio channels concurrently. Channel assignment and routing are underlying challenges in multiradio architectures since both determine the traffic distribution over links and channels. The interdependency between channel assignments and routing promotes toward the joint solutions for efficient configurations. This paper presents an in-depth review of the joint approaches of channel assignment and routing in multiradio wireless mesh networks. First, the key design issues, modeling, and approaches are identified and discussed. Second, existing algorithms for joint channel assignment and routing are presented and classified based on the channel assignment types. Furthermore, the set of reconfiguration algorithms to adapt the network traffic dynamics is also discussed. Finally, the paper presents some multiradio practical implementations and test-beds and points out the future research directions.

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Tlouyamma, Joseph, und Mthulisi Velempini. „Channel Selection Algorithm Optimized for Improved Performance in Cognitive Radio Networks“. Wireless Personal Communications 119, Nr. 4 (26.04.2021): 3161–78. http://dx.doi.org/10.1007/s11277-021-08392-5.

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AbstractA major concern in the recent past was the traditional static spectrum allocation which gave rise to spectrum underutilization and scarcity in wireless networks. In an attempt to solve this challenge, cognitive radios technology was proposed. It allows a spectrum to be accessed dynamically by Cognitive radio users or secondary users (SU). Dynamic access can efficiently be achieved by making necessary adjustment to some Medium access control (MAC) layer functionalities such as sensing and channel allocation. MAC protocols play a central role in scheduling sensing periods and channel allocation which ensure that the interference is reduced to a tolerable level. In order to improve the accuracy of sensing algorithm, necessary adjustments should be made at MAC layer. Sensing delays and errors are major challenges in the design of a more accurate spectrum sensing algorithm. This study focuses on designing a channel selection algorithm to efficiently utilize the spectrum. Channels are ordered and grouped to allow faster discovery of channel access opportunities. The ordering is based on descending order of channel’s idling probabilities. Grouping of channels ensured that channels are sensed simultaneously. These two techniques greatly reduce delays and maximized throughput of SU. Hence, Extended Generalized Predictive Channel Selection Algorithm, a proposed scheme has significantly performed better than its counterpart (Generalized Predictive Channel Selection Algorithm). Matlab simulation tool was used to simulate and plot the results of the proposed channel selection algorithm.

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Zhou, Yuan, Minseok Kim, Hideaki Momose und Satoru Yasukawa. „Device-Free Indoor Location Estimation System Using Commodity Wireless LANs“. Telecom 2, Nr. 2 (21.04.2021): 181–98. http://dx.doi.org/10.3390/telecom2020012.

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In recent years, propagation channel characteristics have been effectively used in several applications such as motion sensing and position detection. Considerable attention has been paid to channel-sounding methods that are easy to utilize using low-cost devices. This paper presents a device-free indoor location estimation method using the spatio-temporal features of radio propagation channels using a 2.4 GHz-band three-by-three multiple-input-multiple-output (MIMO) channel sounder developed using commodity wireless local area network (WLAN). The measurement results demonstrated a reasonable performance of the proposed method with a small number of antennas.

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Juraschek, Felix, Mesut Günes und Bastian Blywis. „A Framework for External Interference-Aware Distributed Channel Assignment“. International Journal of Wireless Networks and Broadband Technologies 1, Nr. 4 (Oktober 2011): 40–54. http://dx.doi.org/10.4018/ijwnbt.2011100103.

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DES-Chan is a framework for experimentally driven research on distributed channel assignment algorithms in wireless mesh networks. DES-Chan eases the development process by providing a set of common services required by distributed channel assignment algorithms. A new challenge for channel assignment algorithms are sources of external interferences. With the increasing number of wireless devices in the unlicensed radio spectrum, co-located devices that share the same radio channel may have a severe impact on the network performance. DES-Chan provides a sensing component to detect such external devices and predict their future activity. As a proof of concept, the authors present a reference implementation of a distributed greedy channel assignment algorithm. The authors evaluate its performance in the DES-Testbed, a multi-transceiver wireless mesh network with 128 nodes at the Freie Universität Berlin.

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Baziana, Peristera A., und Ioannis E. Pountourakis. „A Reservation Protocol Analysis for Multi-Channel Wireless Networks“. Journal of Communications Software and Systems 2, Nr. 4 (04.04.2017): 340. http://dx.doi.org/10.24138/jcomss.v2i4.279.

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A synchronous multi-channel multi-access Medium Access Control (MAC) protocol for Wireless Local Area Networks (WLANs) is studied in this paper. The proposed protocol introduces an access control reservation scheme and requires a single radio per station. The receiver collisionsphenomenon characterizes the performance of the proposedmulti-channel system. A priority scheme is considered in order to primary serve the time-sensitive traffic such as voice, as compared to the delay tolerant data traffic. The innovation of this paper is the extensive and accurate study of the receiver collisions effect on the network performance in multi-traffic environment. An analytic discrete time Markovian model is developed for finite number of stations and channels. The performance measures of throughput, delay, and average rejection probability at destination are analytically estimated. Numerical results are presented for comparison for various numbers of channels and stations. The proposed MAC protocol provides a substantial contribution to the understanding of wireless multi-channel multi-traffic environments.

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Imoize, Agbotiname Lucky, Augustus Ehiremen Ibhaze, Aderemi A. Atayero und K. V. N. Kavitha. „Standard Propagation Channel Models for MIMO Communication Systems“. Wireless Communications and Mobile Computing 2021 (15.02.2021): 1–36. http://dx.doi.org/10.1155/2021/8838792.

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The field of wireless communication networks has witnessed a dramatic change over the last decade due to sophisticated technologies deployed to satisfy various demands peculiar to different data-intensive wireless applications. Consequently, this has led to the aggressive use of the available propagation channels to fulfill the minimum quality of service (QoS) requirement. A major barometer used to gauge the performance of a wireless communication system is the spectral efficiency (SE) of its communication channels. A key technology used to improve SE substantially is the multiple input multiple output (MIMO) technique. This article presents a detailed survey of MIMO channel models in wireless communication systems. First, we present the general MIMO channel model and identified three major MIMO channel models, viz., the physical, analytical, and standardized models. The physical models describe the MIMO channel using physical parameters. The analytical models show the statistical features of the MIMO channel with respect to the measured data. The standardized models provide a unified framework for modern radio propagation architecture, advanced signal processing, and cutting-edge multiple access techniques. Additionally, we examined the strengths and limitations of the existing channel models and discussed model design, development, parameterization, implementation, and validation. Finally, we present the recent 3GPP-based 3D channel model, the transitioning from 2D to 3D channel modeling, discuss open issues, and highlight vital lessons learned for future research exploration in MIMO communication systems.

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Jun, Luo, Lu Wen Jun, Ye Fei, Sun Shuang Xi und Pe Dong Hui. „Design and Implementation of Wireless Channel Test System of UAV“. Applied Mechanics and Materials 380-384 (August 2013): 757–60. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.757.

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UAV wireless channel is the core of their communications systems, this paper designed a stepper adjustable independently programmable power attenuation device and contains three functional subsystems to achieve a radio channel test equipment for testing wireless channel launch power attenuation, receiver sensitivity and receiver bit error rate and other key technical indicators.

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Zhu, Shi Bing, Wen Jun Zhang, Chang Qing Li und Xue Wang. „A New Channel Conflict Model for Multi-Radio Multi-Channel Wireless Networks“. Applied Mechanics and Materials 385-386 (August 2013): 1638–42. http://dx.doi.org/10.4028/www.scientific.net/amm.385-386.1638.

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Before the channel allocation of wireless networks, usually need to select the appropriate channel conflict model to model the channel collision. For the current channel conflict model cant model the channel collision comprehensively, the graph N-tuple coloring model based on graph N-tuple coloring theory is proposed in this article. The theoretical analysis and simulation results show that this model can model the channel collision comprehensively, and transform the channel allocation problem into N-tuple coloring problem on a graph for the further analysis and solve.

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Habib, Arafat, und Sangman Moh. „Wireless Channel Models for Over-the-Sea Communication: A Comparative Study“. Applied Sciences 9, Nr. 3 (28.01.2019): 443. http://dx.doi.org/10.3390/app9030443.

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Over the past few years, the modeling of wireless channels for radio wave propagation over the sea surface has drawn the attention of many researchers. Channel models are designed and implemented for different frequencies and communication scenarios. There are models that emphasize the influence of the height of the evaporation duct in the marine environment, as well as models that deal with different frequencies (2.5, 5, and 10 GHz, etc.) or the impact of various parameters, such as antenna height. Despite the increasing literature on channel modeling for the over-the-sea marine environment, there is no comprehensive study that focuses on key concepts that need to be considered when developing a new channel model, characteristics of channel models, and comparative analysis of existing works along with their possible improvements and future applications. In this paper, channel models are discussed in relation to their operational principles and key features, and they are compared with each other in terms of major characteristics and pros and cons. Some important insights on the design and implementation of a channel model, possible applications and improvements, and challenging issues and research directions are also discussed. The main goal of this paper is to present a comparative study of over-the-sea channel models for radio wave propagation, so that it can help engineers and researchers in this field to choose or design the appropriate channel models based on their applications, classification, features, advantages, and limitations.

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Hoang Lan, Nguyen, und Nguyen Uyen Trang. „Channel assignment for multicast in multi-channel multi-radio wireless mesh networks“. Wireless Communications and Mobile Computing 9, Nr. 4 (April 2009): 557–71. http://dx.doi.org/10.1002/wcm.701.

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He, Shi-Ming, Da-Fang Zhang, Kun Xie, Hong Qiao und Ji Zhang. „Channel Aware Opportunistic Routing in Multi-Radio Multi-Channel Wireless Mesh Networks“. Journal of Computer Science and Technology 29, Nr. 3 (Mai 2014): 487–501. http://dx.doi.org/10.1007/s11390-014-1444-7.

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42

Bertoni, H. L., S. A. Torrico und G. Liang. „Predicting the radio channel beyond second-generation wireless systems“. IEEE Antennas and Propagation Magazine 47, Nr. 4 (August 2005): 28–40. http://dx.doi.org/10.1109/map.2005.1589872.

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43

Кузьмин, Л. В., А. В. Гриневич und М. Д. Ушаков. „Экспериментальное исследование многолучевого распространения хаотических радиоимпульсов в беспроводном канале“. Письма в журнал технической физики 44, Nr. 16 (2018): 48. http://dx.doi.org/10.21883/pjtf.2018.16.46476.17392.

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AbstractAn experimental investigation of the multipath propagation of ultrawideband (UWB) microwave chaotic radio pulses in a wireless channel has been carried out. Based on the results of measurements, conditions of receiving chaotic radio pulses upon passage via a multipath channel are established for various signal delay times.

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Кузьмин, Л. В., und А. В. Гриневич. „Способ слепого обнаружения сверхширокополосных хаотических радиоимпульсов на фоне межимпульсной интерференции“. Письма в журнал технической физики 45, Nr. 16 (2019): 33. http://dx.doi.org/10.21883/pjtf.2019.16.48154.17840.

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The blind detection of ultra-wideband (UWB) chaotic radio pulses of microwave band in multipath channel is considered. Based on the measurement results of propagation of UWB chaotic radio pulses in a real wireless channel, a method for their detection is proposed that is not affected by interpulse interference.

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Kuzmin, Lev, und Alexander Grinevich. „Ultra-wideband chaotic radio pulse reception in the case of inter-pulse interference“. ITM Web of Conferences 30 (2019): 03009. http://dx.doi.org/10.1051/itmconf/20193003009.

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The problem of receiving ultra-wideband (UWB) chaotic radio pulses of microwave band that passed through a multipath channel is considered. Based on measurements of UWB chaotic radio pulse propagation through a real wireless channel, a method for reception is proposed that is not affected by interpulse interference.

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Lim, Sangsoon. „IACR: an interference-aware channel reservation for wireless sensor networks“. International Journal of Electrical and Computer Engineering (IJECE) 9, Nr. 2 (01.04.2019): 1220. http://dx.doi.org/10.11591/ijece.v9i2.pp1220-1225.

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In battery-based wireless sensor networks, energy-efficient operation is one of the most important factors. Especially, in order to improve energy efficiency in wireless sensor networks, various studies on low power operation have been actively conducted in the MAC layer. In recent years, mutual interference among various radio technologies using the same radio frequency band has become a serious problem. Wi-Fi, ZigBee, and Bluetooth use the same frequency band of 2.4GHz at the same time, which causes various signal interference problems. In this paper, we propose a novel channel reservation scheme, called IACR, to improve the energy efficiency of wireless sensor networks in an environment where interference occurs between various wireless technologies. The proposed scheme inserts a PN code into a long preamble for exchanging transmission status information between a transmitting node and a receiving node, thereby improving the transmission success probability while receiving less influence on transmission of other radio technologies. We performed an event-driven simulation and an experiment to measure the signal detection rate. As a result, it can be seen that the proposed technique reduces the packet drop rate by 15% and increases the discoverable distance of the control packet for channel reservation.

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Patil, Hemlata, Sai Vennela Nekkanti, Disha Negi, Nikita Masanagi und Sakshi More. „Spectrum Sensing Using Energy Detector in Rayleigh Fading Channel“. ITM Web of Conferences 32 (2020): 02005. http://dx.doi.org/10.1051/itmconf/20203202005.

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Cognitive Radio, which is an adaptive and intelligent radio has an important feature called spectrum sensing. It monitors the presence or absence of the authorized users in a fixed or licensed spectrum. There is a rise in the use of wireless communications in recent times, which has led to the underutilization of the available bandwidth. This problem can be solved to some extent by using cognitive radio technology. Cognitive radio gives an opportunity for unauthorized users to use the licensed spectrum, resourcefully, when not in use. Using spectrum sensing energy detection methods, the existence of authorized users, in various fading channels can be done. The operating characteristics of the receiver can be analyzed using parameters of performance like signal to noise ratio, probability of false-alarm, probability of detection. In this paper we assess Rayleigh fading channel and compare with AWGN (non- fading) channel. Theoretical and simulated results are compared, and observations are being made.

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Abdelatty, Omar, Xing Chen, Abdullah Alghaihab und David Wentzloff. „Bluetooth Communication Leveraging Ultra-Low Power Radio Design“. Journal of Sensor and Actuator Networks 10, Nr. 2 (26.04.2021): 31. http://dx.doi.org/10.3390/jsan10020031.

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Energy-efficient wireless connectivity plays an important role in scaling both battery-less and battery-powered Internet-of-Things (IoT) devices. The power consumption in these devices is dominated by the wireless transceivers which limit the battery’s lifetime. Different strategies have been proposed to tackle these issues both in physical and network layers. The ultimate goal is to lower the power consumption without sacrificing other important metrics like latency, transmission range and robust operation under the presence of interference. Joint efforts in designing energy-efficient wireless protocols and low-power radio architectures result in achieving sub-100 μW operation. One technique to lower power is back-channel (BC) communication which allows ultra-low power (ULP) receivers to communicate efficiently with commonly used wireless standards like Bluetooth Low-Energy (BLE) while utilizing the already-deployed infrastructure. In this paper, we present a review of BLE back-channel communication and its forms. Additionally, a comprehensive survey of ULP radio design trends and techniques in both Bluetooth transmitters and receivers is presented.

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Mahajan, Rita, und Deepak Bagai. „Improved Learning Scheme for Cognitive Radio using Artificial Neural Networks“. International Journal of Electrical and Computer Engineering (IJECE) 6, Nr. 1 (01.02.2016): 257. http://dx.doi.org/10.11591/ijece.v6i1.9107.

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The future of wireless system is facing the problem of spectrum scarcity. Number of users is increasing rapidly but available spectrum is limited. The Cognitive Radio (CR) network technology can enable the unlicensed users to share the frequency spectrum with the licensed users on a dynamic basis without creating any interference to primary user. Whenever secondary user finds that primary user is not transmitting and channel is free then it uses channel opportunistically. In this paper cognitive radio with predictive capability using artificial neural network has been proposed. The advantage of such cognitive user is saving of time and energy for spectrum sensing. Proposed radio will sense only that channel which is predicted to be free and channel is selected on the basis of maximum vacant time. Performance has been evaluated in the term of mean square error. The results show that this learning capability can be embedded in secondary users for better performance of future wireless technologies.

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Mahajan, Rita, und Deepak Bagai. „Improved Learning Scheme for Cognitive Radio using Artificial Neural Networks“. International Journal of Electrical and Computer Engineering (IJECE) 6, Nr. 1 (01.02.2016): 257. http://dx.doi.org/10.11591/ijece.v6i1.pp257-267.

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The future of wireless system is facing the problem of spectrum scarcity. Number of users is increasing rapidly but available spectrum is limited. The Cognitive Radio (CR) network technology can enable the unlicensed users to share the frequency spectrum with the licensed users on a dynamic basis without creating any interference to primary user. Whenever secondary user finds that primary user is not transmitting and channel is free then it uses channel opportunistically. In this paper cognitive radio with predictive capability using artificial neural network has been proposed. The advantage of such cognitive user is saving of time and energy for spectrum sensing. Proposed radio will sense only that channel which is predicted to be free and channel is selected on the basis of maximum vacant time. Performance has been evaluated in the term of mean square error. The results show that this learning capability can be embedded in secondary users for better performance of future wireless technologies.

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