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5th International Conference on Information and Communication Technology Convergence (ICTC)

作者： Park, Woo Jin Yang, Hyun Jong UNIST Sch Elect & Comp Engn Ulsan South Korea

ISBN: (纸本)9781479967865

Two-way relaying has been known to double the spectral efficiency of the one-way relaying scheme in a single cell system. In this paper, we observe a unique intercell interference issue which is caused when employing the two-way relaying in a multicell system. To circumvent this uplink interference problem, we consider a fractional frequency reuse. We evaluate the performance of the decode-and-forward two-way relaying in the orthogonal frequency division multiplexing multicell two-way relay network. In particular, the direct communication without relaying is also taken into account for the cell-center sector. Under this scenario, relay parameters such as the transmit power and position are optimized through numerical simulations to maximize the cell-throughput. In the simulations, a practical environment is considered, such as non-zero transition beam width for the cell-sectorization.

关键词： two-way relay physical-layer network coding multicell interference resource allocation radio resource management

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Time-efficient Relaying Strategies for Military Communication 33

Time-efficient Relaying Strategies for Military Communicatio...

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33rd Annual IEEE Military Communications Conference on Affordable Mission Success - Meeting the Challenge (MILCOM)

作者： Bajaj, Ian Gong, Yi Yee, Hui Lee Nanyang Technol Univ Sch Elect & Elect Engn Singapore 639798 Singapore South Univ Sci & Technol China Dept Elect & Elect Engn Shenzhen Peoples R China

ISBN: (纸本)9781479967704

Military communication relies on robust and secure physical links that adhere to regulatory protocols and standards for communication. In unfamiliar terrain or hostile conditions these physical links can undergo deep-fading or intentional signal jamming, deteriorating the ongoing communication. Traditional retransmission technology or power adaptation would not be applicable to correct the outages seen in such scenarios, and often relays have been sought out as the solution. However given the exigency related to in-battle military communications, the latency with relaying cannot be tolerated and designing a scheme that is time-efficient is crucial. To this end, we discuss a practical approach to establishing bi-directional communication via a support node that acts a partial relay to the stranded military units, while maintaining its ongoing communication. This is possible through the use of a broadcast spatial multiplexing protocol implemented through space-time block coding at the relay. Our simulation results show us improved BER (bit-error rate) performance than the perfect direct link for high-SNR (signal-to-noise ratio) regimes, and comparable performance across the spectrum. We also demonstrate that our scheme is impervious to power asynchronicities between the stranded military nodes.

关键词： physical-layer network coding space-time block coding relaying deep fading military communication

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Buffer-Aided Two-Way Relaying with Lattice Codes 5

Buffer-Aided Two-Way Relaying with Lattice Codes

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5th International Conference on Information and Communication Technology Convergence (ICTC)

作者： Yang, Hyun Jong Lee, Byeong Su Jung, Bang Chul UNIST Sch Elect & Comp Engn Ulsan South Korea Gyeongsang Natl Univ Dept Informat & Commun Engn Jinju South Korea

ISBN: (纸本)9781479967865

The achievable sum-rate of the two-way relaying becomes far below the cut-set outer bound if the signal-to-noise-ratio (SNR) from one node to the relay is significantly different from the SNR from the other node to the relay, and particularly so for decode-and-forward or compute-and-forward type relaying. In this paper, we propose a buffer-aided compute-and-forward two-way relaying with lattice codes to improve the sum-rate in asymmetric SNR two-way relay channels (TWRCs). Specifically, the relay can store some amount of data received in the multiple access phase before forwarding it, thereby controlling the amount of data to be transmitted to each direction in the broadcast phase. Simulation results show that the sum-rate can be improved with the use of buffers compared to the conventional two-way relaying without buffers.

关键词： buffer-aided two-way relaying physical-layer network coding lattice codes

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Bidirectional Cellular Relay network with Distributed Relaying

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IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 2013年第10期31卷 2082-2098页

作者： Wang, Fanggang Yuan, Xiaojun Liew, Soung Chang Li, Yonghui Beijing Jiaotong Univ State Key Lab Rail Traff Control & Safety Sch Elect & Informat Engn Beijing Peoples R China Chinese Univ Hong Kong Inst Network Coding Hong Kong Hong Kong Peoples R China Chinese Univ Hong Kong Dept Informat Engn Hong Kong Hong Kong Peoples R China Univ Sydney Sch Elect & Informat Engn Sydney NSW 2006 Australia

In this paper, we consider a bidirectional cellular relay network with distributed relays where a single base station exchanges information with multiple independent users through multiple single-antenna relays. We design the transceivers at the base station, the relays, and the users. The related optimization problems are generally non-convex and difficult to solve. In this paper, we propose a unified framework to design the transceiver algorithms based on two criteria, i.e. weighted sum MSE minimization and sum rate maximization. Specifically, we show that the sum rate maximization problem can be converted into an iterative weighted sum MSE minimization problem. Low-complexity iterative algorithms are developed for both weighted sum MSE minimization and sum rate maximization optimization problems. However, the convergence points of the proposed iterative algorithms are sensitive to the initial conditions, especially in the high signal-to-noise ratio (SNR) regime. For this reason, we further derive the high-SNR asymptotically optimal solutions and use them as the initials for the proposed iterative algorithms. Simulation results show that the proposed scheme can approximately double the system throughput, compared to the conventional four-stage transmission schemes.

关键词： Distributed relay linear precoding minimum mean square error (MMSE) physical-layer network coding

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Two-User Turbo Decoding with Simplified Sum Trellis in Two-Way Relay Channel

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IEICE TRANSACTIONS ON COMMUNICATIONS 2013年第1期E96B卷 73-80页

作者： Lu, Shan Cheng, Jun Li, Ying Watanabe, Yoichiro Doshisha Univ Dept Intelligent Informat Engn & Sci Kyotanabe 6120321 Japan Xidian Univ State Key Lab ISN Xian Peoples R China

physical-layer network coding with binary turbo coding in a two-way relay channel is considered. A two-user turbo decoding scheme is proposed with a simplified sum trellis. For two-user iterative decoding at a relay, the component decoder with its simplified sum trellis decodes the superimposed signal to the arithmetic sum of two users' messages. The simplified sum trellis is obtained by removing one of the states in a pair of mutual symmetrical states from a sum trellis. This removal reduces the decoding complexity to half of that with the sum trellis, and does not degrade decoding performance over AWGN channel since two output sequences from the pair of mutual symmetrical states are the same.

关键词： two-way relay channel physical-layer network coding turbo decoding sum trellis

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High-Throughput Cooperative Communication with Interference Cancellation for Two-Path Relay in Multi-Source System

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2013年第10期12卷 4840-4851页

作者： Lu, Hao Hong, Peilin Xue, Kaiping Univ Sci & Technol China Informat Network Lab EEIS Dept Hefei 230027 Peoples R China

Relay-based cooperative communication has become a research focus in recent years because it can achieve diversity gain in wireless networks. In existing works, network coding and the two-path relay scheme is exploited to deal with the increase in network size and the half-duplex nature of relay, respectively. To further improve bandwidth efficiency, we propose a novel cooperative transmission scheme which combines network coding and the two-path relay scheme together in the multi-source system. Due to the utilization of two-path relay, our proposed scheme achieves full-rate transmission. Adopting complex field network coding (CFNC) at both the sources and the relays ensures that symbols from different sources are allowed to be broadcasted in the same time slot. We also adopt physical-layer network coding (PNC) at the relay nodes to deal with the inter-relay interference caused by the two-path relay. With careful process design, our scheme can achieve the ideal throughput up to 1 symbol per source per time slot (sym/S/TS). Furthermore, the theoretical analysis provides a method to estimate the symbol error probability (SEP) and throughput in complex additive white Gaussian noise (AWGN) and Rayleigh fading channels. The simulation results verify the improvements achieved by the proposed scheme.

关键词： Complex field network coding two-path relay inter-relay interference physical-layer network coding throughput

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Multiple-Input Multiple-Output Two-Way Relaying: A Space-Division Approach

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IEEE TRANSACTIONS ON INFORMATION THEORY 2013年第10期59卷 6421-6440页

作者： Yuan, Xiaojun Yang, Tao Collings, Iain B. Chinese Univ Hong Kong Inst Network Coding Hong Kong Hong Kong Peoples R China CSIRO ICT Ctr Marsfield NSW 2122 Australia

We propose a novel space-division-based network-coding scheme for multiple-input multiple-output (MIMO) two-way relay channels (TWRCs), in which two multiantenna users exchange information via a multiantenna relay. In the proposed scheme, the overall signal space at the relay is divided into two subspaces. In one subspace, the spatial streams of the two users have nearly orthogonal directions and are completely decoded at the relay. In the other subspace, the signal directions of the two users are nearly parallel, and linear functions of the spatial streams are computed at the relay, following the principle of physical-layer network coding. Based on the recovered messages and message-functions, the relay generates and forwards network-coded messages to the two users. We show that, at high signal-to-noise ratio, the proposed scheme achieves the asymptotic sum-rate capacity of the MIMO TWRC within 1/2 log (5/4) approximate to 0.161 bits per user-antenna, for any antenna configuration and any channel realization. We perform large-system analysis to derive the average sum-rate of the proposed scheme over Rayleigh-fading MIMO TWRCs. We show that the average asymptotic sum-rate gap to the capacity is at most 0.053 bits per relay-antenna. It is demonstrated that the proposed scheme significantly outperforms the existing schemes.

关键词： Multiple-input multiple-output (MIMO) physical-layer network coding space-division precoding two-way relay channel (TWRC)

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Wireless MIMO Switching: Sum Rate Optimization

Wireless MIMO Switching: Sum Rate Optimization

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IEEE Wireless Communications and networking Conference (WCNC)

作者： Wang, Fanggang Yuan, Xiaojun Liew, Soung Chang Guo, Dongning Beijing Jiaotong Univ EIE State Key Lab Rail Traff Control & Safety Beijing Peoples R China Chinese Univ Hong Kong Inst Network Coding Hong Kong Hong Kong Peoples R China Northwestern Univ Dept Elect Engn & Comp Sci Evanston IL USA

ISBN: (纸本)9781467359399;9781467359382

This paper addresses relay design for a wireless multiple-input-multiple-output (MIMO) switching scheme that enables data exchange among multiple users. Here, a multi-antenna relay linearly precodes the received (uplink) signals from multiple users before forwarding the signal in the downlink, where the purpose of precoding is to let each user receive its desired signal with interference from other users suppressed. The problem of optimizing the precoder based on sum-rate maximization criteria is typically non-convex and difficult to solve. The main contribution of this paper is that we show the sumrate maximization problem can be converted to an equivalent weighted sum-MSE minimization problem and can therefore be solved using an iterative algorithm proposed in our previous work. Asymptotic analysis reveals that, with properly chosen initial values, the proposed iterative algorithms are asymptotically optimal in both high and low signal-to-noise-ratio (SNR) regimes for MIMO switching, either with or without self-interference cancellation (a.k.a., physical-layer network coding). Numerical results show that the optimized MIMO switching scheme based on the proposed algorithms significantly outperforms existing approaches in the literature.

关键词： Beamforming linear precoding MIMO switching minimum mean square error (MMSE) physical-layer network coding relay

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Joint-Denoise-and-Forward Protocol for Multi-Way Relay networks

Joint-Denoise-and-Forward Protocol for Multi-Way Relay Netwo...

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Annual Summit and Conference of the Asia-Pacific-Signal-and-Information-Processing-Association (APSIPA)

作者： Chang, Ronald Y. Lin, Sian-Jheng Chung, Wei-Ho Acad Sinica Res Ctr Informat Technol Innovat Taipei Taiwan

ISBN: (纸本)9789869000604

This paper considers a multi-way relay network in which multiple users intend to achieve full information exchange with one another with the aid of a single relay. The denoise-and-forward (DNF) protocol with binary physical-layer network coding (PNC) is considered. A novel denoising scheme is proposed which does not require any modification on the communication mechanism of the original DNF protocol but only exploits the correlation among multiple received signals at the relay. The decision regions and denoise mapping for the proposed scheme and the original scheme are illustrated and compared for an exemplary three-way relay network. Simulation results verify the efficacy of the proposed scheme in achieving improved user decoding performance.

关键词： physical-layer network coding denoise-and-forward multi-way relay networks

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Throughput Improvement by network coding and Spatial Reuse in Wireless Mesh networks

Throughput Improvement by Network Coding and Spatial Reuse i...

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IEEE Global Communications Conference

作者： Zhaolong Ning Qingyang Song Lei Guo Abbas Jamalipour School of Information Science and Engineering Northeastern University Shenyang 110819 P. R. China School of Electrical and Information Engineering University of Sydney NSW 2006 Australia

ISBN: (纸本)9781479913510

It is understood that the performance of network coding (NC) is largely dependent on link scheduling schemes, and greedy NC may in fact reduce network throughput due to the reduction of spectrum spatial reuse. In this paper, we study the interplay between NC and spatial reuse, and present a NC-aware link scheduling scheme to increase network throughput. Then, we propose an adaptive power control scheme to decrease interference so that NC and spatial reuse can be complementary in throughput improvement. Simulation results demonstrate that NC and spatial reuse are suitable for different network environments, and our proposed schemes can optimize network throughput by taking full advantage of the superiorities of both NC and spatial reuse in different network topologies.

关键词： physical-layer network coding link scheduling spatial reuse power control

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