Zeitschriftenartikel: „Full-duplex FDX“

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Vyas, Rushi, und Bailey Tye. „A Sequential RFID System for Robust Communication with Underground Carbon Steel Pipes in Oil and Gas Applications“. Electronics 8, Nr. 12 (20.11.2019): 1374. http://dx.doi.org/10.3390/electronics8121374.

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The world’s oil and gas is transported using a network of steel pipelines most of which lie underground. The length of this network in the US/Canada alone is 3.5 million kilometers. Keeping track of pipes in such a network for pipeline-health monitoring, maintenance, and logistics is an acute problem faced by pipeline-operators. Recently, radio-frequency-identification tags (RFIDs) have been proposed for tracking pipelines and even for monitoring pipeline health with additional built-in sensors. Low-cost RFID tags are wirelessly powered and battery-less. However, RFIDs do not function optimally in the presence of magnetic carbon steel pipes that are prevalent in the industry. High-frequency wireless signals also attenuate rapidly through wet soils. In this research, the use of passive RFID sensor platforms for interrogating buried pipes up to 1.25 m deep in the LF bands is proposed. Using magnetic-induction-based communication, a test-comparison between conventional full/half duplex (FDX/HDX) and sequential (SEQ) RFID schemes is detailed. Wireless measurements in the presence of an industry-standard ASTM A-53 carbon-steel pipe show a SEQ RFID offering better immunity against magnetic proximity effects of the pipe’s wall with an 8.3 dB (x6.8) improvement over a FDX/HDX RFID operating under similar conditions over a distance of 80–125 cm at which pipes are typically buried.

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Febrianto, Teddy, Jiancao Hou und Mohammad Shikh-Bahaei. „Cooperative Full-Duplex Physical and MAC Layer Design in Asynchronous Cognitive Networks“. Wireless Communications and Mobile Computing 2017 (2017): 1–14. http://dx.doi.org/10.1155/2017/8491920.

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In asynchronous cognitive networks (CNs), where there is no synchronization between primary users (PUs) and secondary users (SUs), spectrum sensing becomes a challenging task. By combining cooperative spectrum sensing and full-duplex (FD) communications in asynchronous CNs, this paper demonstrates improvements in terms of the average throughput of both PUs and SUs for particular transmission schemes. The average throughputs are derived for SUs and PUs under different FD schemes, levels of residual self-interference, and number of cooperative SUs. In particular, we consider two types of FD schemes, namely, FD transmit-sense-reception (FDr) and FD transmit-sense (FDs). FDr allows SUs to transmit and receive data simultaneously, whereas, in FDs, the SUs continuously sense the channel during the transmission time. This paper shows the respective trade-offs and obtains the optimal scheme based on cooperative FD spectrum sensing. In addition, SUs’ average throughput is analyzed under different primary channel utilization and multichannel sensing schemes. Finally, new FD MAC protocol design is proposed and analyzed for FD cooperative spectrum sensing. We found optimum parameters for our proposed MAC protocol to achieve higher average throughput in certain applications.

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Sulaeman, Enceng, Yaya Sulaeman und Asep Yudi Hercuadi. „Desain dan Implementasi Duplekser dengan Metoda Pseudo-Interdigital untuk Uplink dan Downlink LTE“. Jurnal Elektronika dan Telekomunikasi 13, Nr. 2 (29.06.2016): 73. http://dx.doi.org/10.14203/jet.v13.73-80.

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Duplekser merupakan perangkat yang dapat mengisolasi receiver dari transmitter saat keduanya saling berbagi antena yang sama, digunakan agar komunikasi bisa berjalan secara full duplex. Ada dua metode transmisi duplex yaitu frequency division duplex (FDD) dan time division duplex (TDD). FDD merupakan teknik duplex yang menggunakan dua frekuensi yang berbeda untuk melakukan komunikasi dalam dua arah, sedangkan TDD menggunakan frekuensi tunggal dan frekuensi tersebut digunakan oleh semua kanal untuk melakukan pengiriman dan penerimaan data. Gabungan dua bandpass filter dengan metoda pseudo-interdigital untuk aplikasi LTE (long term evolution). Metode ini lebih unggul dibandingkan duplekser dengan metoda hybrid. Duplekser bekerja pada FDD LTE band ke-7 yaitu frekuensi uplink 2500-2570 MHz dan downlink 2620-2690 MHz. Dari hasil pengukuran diperoleh sebagai berikut: nilai frekuensi center pada uplink 2639 MHz dan pada downlink 2659 MHz, insertion loss pada uplink 1,561 dB dan downlink 1,74 dB, bandwidth ±70 MHz, isolasi 23,03 dB, serta nilai return loss 23,5 dB pada uplink dan downlink 23,45 dB.

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Nguyen, Hieu V., Van-Dinh Nguyen und Oh-Soon Shin. „In-Band Full-Duplex Relaying for SWIPT-Enabled Cognitive Radio Networks“. Electronics 9, Nr. 5 (20.05.2020): 835. http://dx.doi.org/10.3390/electronics9050835.

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This paper studies sum rate maximization of a cognitive radio network, where a full-duplex relay (FDR) is considered to assist data transmission. An FDR equipped with multiple transmit/receive antennas is introduced to harvest energy from the radio frequency signal of the primary system to reuse the energy for its own data transmission. By exploiting the time-switching relaying protocol, we first formulate an optimization problem for the sum rate of primary and secondary receivers and then propose a low-complexity algorithm to find the optimal solution. Numerical results verify the effectiveness of the proposed technique for wireless information and power transfer in cognitive radio systems.

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Manga, N. Alivelu. „Self-Interference Cancellation in Full Duplex Communication using Steepest Descent Method“. International Journal for Research in Applied Science and Engineering Technology 9, Nr. VI (20.06.2021): 1433–42. http://dx.doi.org/10.22214/ijraset.2021.35281.

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The present-day communication system uses Frequency Division Duplex (FDD) to emulate the benefits of Full Duplex Communication. But it requires more bandwidth as the cost of the spectrum is very high it becomes a major limitation. To overcome this problem implementation of Full Duplex Communication is the best solution. Implementation of full duplex communication is difficult because of a significant problem called self-interference. while transmitting and receiving signals on the same frequency band, receiving signal is interfered with the transmitted signal this phenomenon is called self-interference. The objective of this project is to minimize that self-interference signal from the received signal by using signal processing technique, LMS echo cancellation. Least Mean Square (LMS) echo canceller whose coefficients are updated iteratively is used to cancel the self-interference. An algorithm based on steepest descent method is used to obtain coefficients that change iteratively with varying step size to solve Weiner-Hopfs equation.

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Liu, Yi, Yue Dai, Xiang-Gen Xia, Ce Kang und Hailin Zhang. „SC-FDE Based Full-Duplex Relay Communication Robust to Residual Loop Interference“. IEEE Wireless Communications Letters 6, Nr. 4 (August 2017): 538–41. http://dx.doi.org/10.1109/lwc.2017.2713381.

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K.Venkatesh, G., und P. V.Rao. „Performance analysis of a novel method for fast handovers in TDD and FDD for long term evolution“. International Journal of Engineering & Technology 7, Nr. 1.9 (01.03.2018): 115. http://dx.doi.org/10.14419/ijet.v7i1.9.9745.

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The LTE Long Term Evolution highly developed Technology, Handover is the essential function of the mobility of user in cellular networks in Time Division Duplex as well as Frequency Division Duplex. Handover is one of the essential that can affect the [QoS] Quality of Service with Capacity of Mobile Broadband Networks. Within mobile cellular network communication systems, a (spectrum) limited shared resource needs to be shared with all the users, so full duplex communication is achieved. This paper involves studying diverse Hand over delay parameters and also focus on reducing “Hard Handover delay” by minimizing interruption time, activation time, wireless channel accesses time as well as the wireless link transmission delay. Technique is developed in order to reduce the handover delay time in Time Division Duplex network which too reduces the wireless channel access time and the wireless link transmission delay. A novel handover algorithm is developed which would decreases the handover delay time and access time inside mobile network environment.Additional work may be conceded on to obtain enhanced performance and Quality of service in Time Division Duplex mobile network.

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Eshteiwi, Khaled, Georges Kaddoum und M. S. Alam. „Ergodic Capacity Analysis of Full Duplex Relaying in the Presence of Co-Channel Interference in V2V Communications“. Sensors 20, Nr. 1 (02.01.2020): 261. http://dx.doi.org/10.3390/s20010261.

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We analyze the ergodic capacity of a dual-hop full duplex amplify-and-forward (AF) vehicle-to-vehicle (V2V) cooperative relaying system over Nakagami-m fading channels. In this context, the impacts of self-interference (SI) at the relay and co-channel interference (CCI) at the destination are taken into account in this analysis. Precisely, based on the analysis of the moment generating function (MGF) of the signal-to-interference-plus-noise ratio (SINR), new exact and lower bound expressions for the ergodic capacity are derived. The ergodic capacity upper bound is also derived based on the asymptotic outage probability of the approximated SINR. Monte-Carlo simulation results are presented to corroborate the derived analytical results. Our results show the significant impact of the considered interferences on the system performance. It is shown that the ergodic capacity is degraded when the average SI at the relay and/or the average CCI at the destination is increased. This highlights the importance of taking these phenomena into account in the performance evaluation in order to assess the practical limit of full duplex relaying (FDR) cooperative wireless communications. Interestingly, it is also observed that FDR with SI and CCI still shows a higher ergodic capacity than the interference-free half duplex relaying, especially at medium to high signal-to-noise ratios (SNRs).

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Ebrahimi Jarihani, Arash, Sahar Sarafi, Michael Koeberle, Johannes Sturm und Andrea M. Tonello. „A 16 Gbps, Full-Duplex Transceiver over Lossy On-Chip Interconnects in 28 nm CMOS Technology“. Electronics 9, Nr. 5 (26.04.2020): 717. http://dx.doi.org/10.3390/electronics9050717.

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A high-speed full-duplex transceiver (FDT) over lossy on-chip interconnects is presented. The FDT employs a hybrid circuit to separate the inbound and outbound signals from each other and also performs echo-cancellation with the help of the main and the auxiliary drivers. A hybrid MOS device is utilized for impedance matching and conversion of the received voltage signal into a current signal for amplification. Moreover, a compensation capacitance ( C c ) is used at the output of the main driver to minimize the residual echo signal and achieve a higher data rate. The entire FDT architecture has been designed in TSMC 28 nm CMOS standard process with 0.9 V supply voltage. The performance results validate a 16 Gbps FD operation with a root-mean-square (RMS) jitter of 16.4 ps, and a power efficiency of 0.16 pJ/b/mm over a 5 mm on-chip interconnect without significant effect due to process-voltage-temperature (PVT) variations. To the best knowledge of the authors, this work shows the highest achievable full-duplex data rate, among the solutions reported in the literature to date, yet with low complexity, low layout area of 1581 μ m 2 and competitive power efficiency.

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Al-Kadri, M. Omar, Adnan Aijaz und Arumugam Nallanathan. „X-FDR: A Cross-Layer Routing Protocol for Multihop Full-Duplex Wireless Networks“. IEEE Wireless Communications 26, Nr. 2 (April 2019): 70–77. http://dx.doi.org/10.1109/mwc.2017.1700243.

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Guimarães, Lucas de Melo, und Jacir Luiz Bordim. „FDT-MAC: Reduzindo a latência das comunicações full-duplex em redes móveis sem fio“. Brazilian Journal of Development 5, Nr. 11 (2019): 23288–306. http://dx.doi.org/10.34117/bjdv5n11-049.

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Mondal, Susnata, und Jeyanandh Paramesh. „Power-Efficient Design Techniques for mm-Wave Hybrid/Digital FDD/Full-Duplex MIMO Transceivers“. IEEE Journal of Solid-State Circuits 55, Nr. 8 (August 2020): 2011–26. http://dx.doi.org/10.1109/jssc.2020.2987691.

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13

Wu, Peiran, Robert Schober und Vijay K. Bhargava. „Robust Transceiver Design for SC-FDE Multi-hop Full-Duplex Decode-and-Forward Relaying Systems“. IEEE Transactions on Wireless Communications 15, Nr. 2 (Februar 2016): 1129–45. http://dx.doi.org/10.1109/twc.2015.2485987.

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Zhou, Jin, Tsung-Hao Chuang, Tolga Dinc und Harish Krishnaswamy. „Integrated Wideband Self-Interference Cancellation in the RF Domain for FDD and Full-Duplex Wireless“. IEEE Journal of Solid-State Circuits 50, Nr. 12 (Dezember 2015): 3015–31. http://dx.doi.org/10.1109/jssc.2015.2477043.

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15

Nguyen, Ba Cao, Nguyen Nhu Thang, Tran Manh Hoang und Le The Dung. „Analysis of Outage Probability and Throughput for Energy Harvesting Full-Duplex Decode-and-Forward Vehicle-to-Vehicle Relay System“. Wireless Communications and Mobile Computing 2020 (29.05.2020): 1–10. http://dx.doi.org/10.1155/2020/3539450.

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In this paper, we evaluate the performance of a vehicle-to-vehicle (V2V) system where full-duplex relay (FDR) harvests the energy from source and uses decode-and-forward (DF) protocol to forward data from source to destination. Unlike existing works about FDR systems, we consider the scenario that both relay and destination are moving vehicles, leading to the channel between relay and destination characterized by double (cascade) Rayleigh fading. We successfully obtain the closed-form mathematical expressions of the outage probability (OP) and throughput of the considered energy harvesting- (EH-) FDR-V2V system. Based on these expressions, the system performance is investigated through various scenarios. Numerical results indicate that the performance of the considered system is reduced compared with that of the system over Rayleigh fading channels. We also observe that there is an optimal EH time duration that minimizes the OP and maximizes the throughput. This value depends on the transmission power of source. Furthermore, the OP goes to outage floor faster due to the impact of the residual self-interference (RSI), especially when RSI is high. All analysis results are verified by Monte-Carlo simulations.

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Yao, Yousu, Haisong Cheng, Yijie Wang, Jianwei Mai, Kaixing Lu und Dianguo Xu. „An FDM-Based Simultaneous Wireless Power and Data Transfer System Functioning With High-Rate Full-Duplex Communication“. IEEE Transactions on Industrial Informatics 16, Nr. 10 (Oktober 2020): 6370–81. http://dx.doi.org/10.1109/tii.2020.2967023.

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Yu, Helen, Hoa Truong, Scott A. Mitchell, Albert Liclican, John J. Gosink, Wanying Li, Julie Lin et al. „Homogeneous BTK Occupancy Assay for Pharmacodynamic Assessment of Tirabrutinib (GS-4059/ONO-4059) Target Engagement“. SLAS DISCOVERY: Advancing the Science of Drug Discovery 23, Nr. 9 (16.07.2018): 919–29. http://dx.doi.org/10.1177/2472555218786165.

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Bruton’s tyrosine kinase (BTK) is a clinically validated target for B-cell leukemias and lymphomas with FDA-approved small-molecule inhibitors ibrutinib and acalabrutinib. Tirabrutinib (GS-4059/ONO-4059, Gilead Sciences, Inc., Foster City, CA) is a second-generation, potent, selective, irreversible BTK inhibitor in clinical development for lymphoid malignancies, including chronic lymphocytic leukemia (CLL) and diffuse large B-cell lymphoma (DLBCL). An accurate pharmacodynamic assay to assess tirabrutinib target coverage in phase 1/2 clinical studies will inform dose and schedule selection for advanced clinical evaluation. We developed a novel duplex homogeneous BTK occupancy assay based on time-resolved fluorescence resonance energy transfer (TR-FRET) to measure free and total BTK levels in a multiplexed format. The dual-wavelength emission property of terbium-conjugated anti-BTK antibody served as the energy donor for two fluorescent energy acceptors with distinct excitation and emission spectra. The assay was characterized and qualified using full-length purified recombinant human BTK protein and peripheral blood mononuclear cells derived from healthy volunteers and patients with CLL. We demonstrated assay utility using cells derived from lymph node and bone marrow samples from patients with CLL and DLBCL. Our TR-FRET-based BTK occupancy assay provides accurate, quantitative assessment of BTK occupancy in the clinical trial program for tirabrutinib and is in use in ongoing clinical studies.

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Ab Ghafar, Aimi Syamimi, Norsheila Fisal, Anthony Lo, Siti Marwangi Mohamad Maharum, Faiz Asraf Saparudin und Norshidah Katiran. „Spectral-efficiency and Demand-based Joint Relay and Bandwidth Assignment for Cooperative Relay Network“. Jurnal Teknologi 64, Nr. 3 (15.09.2013). http://dx.doi.org/10.11113/jt.v64.2082.

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Cooperative communication system by exploiting multiple relay nodes (RN) offers significant performance improvement in terms of coverage and capacity. However, using all available RNs in the network is not optimal. Some RNs are located far from user equipment (UE), or having bad link quality due to fading and shadowing. Therefore, only several RNs with good link quality to the UE need to be chosen. Furthermore, in a high user density network, bandwidth is limited which requires proper resource allocation. In addition, each UE has different traffic demand to be satisfied. There are scenarios where eNodeB (eNB) and RN are wasting their resources to UE with low demand, whereas the resources can be used for different UE to compensate for its high demand. In this project, joint problem of relay and bandwidth assignment in a network with heterogeneous user traffic are studied. Accordingly, a Spectral-efficiency and Demand-based Joint Relay and Bandwidth Assignment (SE-D-JRBA) scheme is proposed which is flexible for network with diverse user traffic demands. Numerical evaluation is analyzed for SE-D-JRBA with full-duplex (FDX) and half-duplex (HDX) RN and decode-and-forward (DCF) operation, hence compared to system without relay cooperation. The results demonstrated that the proposed method obtained good system efficiency and fairness.

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„A Low-Power Active Self-Interference Cancellation Technique for SAW-Less FDD and Full-Duplex Receivers“. Journal of Low Power Electronics and Applications 7, Nr. 4 (13.11.2017): 27. http://dx.doi.org/10.3390/jlpea7040027.

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БЫХОВСКИЙ, М. А. „FULL DUPLEX IN COMMUNICATIONS SYSTEMS - METHOD OF ENHANCEMENT THE EFFICIENCY OF USING THE RADIO FREQUENCY SPECTRUM. ANALYTICAL REVIEW“. Труды НИИР, Nr. 4(3) (21.12.2020). http://dx.doi.org/10.34832/niir.2020.3.4.003.

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Представлен аналитический обзор научных публикаций, в которых рассматриваются вопросы построения систем связи с полным дуплексом (FD). В таких системах передача и прием сообщений осуществляются в одном и том же частотном канале, что позволяет существенно повысить эффективность использования радиочастотного спектра по сравнению с современными системами связи с частотным или временным дуплексом. В статье рассмотрены разные функциональные схемы построения систем связи с FD: системы, в которых применяются несколько отдельных приемных и передающих антенн; системы с одной приемо-передающей антенной. Рассмотрены системы,в которых для подавления внутренних помех используются компенсаторы помех,разные виды циркуляторов и балансные системы с несколькими циркуляторами. Представлены формулы,которые позволяют определить величину подавления внутренних помех в разных системах. В обзоре приведены полученные в ряде опубликованных работ экспериментальные данные о величине подавления внутренних помех для разных систем с FD. Обсуждаются актуальность разработки систем связи с FD/а также их важные области применения в подвижной, спутниковой и радиорелейной связи. The paper presents an analytical review of scientific publications, which consider the issues of building communication systems with full duplex (FD). In such systems, the transmission and reception of messages are carried out on the same frequency channel, which makes it possible to significantly increase the efficiency of radio frequency spectrum usage compared to modern communication systems with frequency (FDD) or time (TDD) division duplex. The article discusses different functional schemes for constructing communication systems with FD: systems that use several separate receiving and transmitting antennas and systems with one transceiver antenna. The paper provides an overview of systems that use noise compensators, different types of circulators, and balanced systems with several circulators for internal noise suppression. The author also presents formulas that allow calculating the value of the suppression of the internal noise in different systems. The review presents experimental data obtained in several published works about the value of suppression of internal noise for various systems with FD. The paper discusses the relevance of the development of FD communication systems, as well as important areas of their application in mobile, satellite, and radio relay communications.

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