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Differential Modulation for Bidirectional Relaying With analog network coding

IEEE TRANSACTIONS ON SIGNAL PROCESSING 2010年第7期58卷 3933-3938页

作者： Song, Lingyang Li, Yonghui Huang, Anpeng Jiao, Bingli Vasilakos, Athanasios V. Peking Univ Sch Elect & Comp Sci Beijing 100871 Peoples R China Univ Sydney Sydney NSW 2006 Australia Univ Western Macedonia Dept Comp & Telecommun Engn GR-50100 Kozani Greece

In this correspondence, we propose an analog network coding scheme with differential modulation (ANC-DM) using amplify-and-forward protocol for bidirectional relay networks when neither the source nodes nor the relay knows the channel state information (CSI). The performance of the proposed ANC-DM scheme is analyzed and a simple asymptotic bit error rate (BER) expression is derived. The analytical results are verified through simulations. It is shown that the BER performance of the proposed differential scheme is about 3 dB away from that of the coherent detection scheme. To improve the system performance, the optimum power allocation between the sources and the relay is determined based on the simplified BER. Simulation results indicate that the proposed differential scheme with optimum power allocation yields 1-2 dB performance improvement over an equal power allocation scheme.

关键词： Amplify-and-forward protocol analog network coding bidirectional relaying differential modulation

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CDMA-Based analog network coding for Underwater Acoustic Sensor networks

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2015年第11期14卷 6495-6507页

作者： Kulhandjian, Hovannes Melodia, Tommaso Koutsonikolas, Dimitrios Calif State Univ Fresno Dept Elect & Comp Engn Fresno CA 93740 USA Northeastern Univ Dept Elect & Comp Engn Boston MA 02115 USA SUNY Buffalo Dept Comp Sci & Engn Buffalo NY 14260 USA

We propose ANC-CDMA, a CDMA-based analog network coding scheme for underwater acoustic sensor networks (UW-ASNs) that can significantly improve the underwater acoustic channel utilization. First, we analyze a unidirectional multihop network, in which two acoustic nodes separated by two hops are assigned the same code-division channel (i.e., spreading code) to transmit concurrently. The packets transmitted by the two nodes will collide at the intermediate (relay) node. However, we show that, by exploiting a priori information, i.e., the interfered packet previously received from one of the nodes, and applying joint channel estimation through pilot supervision along with a newly designed adaptive RAKE receiver, the relay node can cancel the interference before decoding the packet of interest. We then extend our analysis to a bidirectional network, in which two nodes first concurrently transmit their packets to the relay using the same spreading code. The relay amplifies and forwards the received interfered packet to the two nodes. We show that either node can still decode the packet of interest after equalizing the channel effects introduced during the propagation from the relay to itself and jointly estimating multipath affected channels and suppressing the self-interference signal before applying the adaptive RAKE receiver. The proposed ANC-CDMA scheme is implemented in a testbed based on Teledyne Benthos Telesonar SM-975 underwater modems and tested extensively in Lake LaSalle. Experiments and simulations demonstrate that for a 1-2 dB tradeoff in signal-to-noise ratio (SNR), the proposed scheme can significantly improve the channel utilization of a unidirectional and bidirectional networks by up to 50% and 100%, respectively, compared with conventional multiuser DS-CDMA scheme.

关键词： Underwater acoustic communications UW-ASNs analog network coding ANC PNC DS-CDMA interference cancelation joint channel estimation RAKE-matched-filter

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On the Performance of Cellular Two-Way Relay Systems with analog network coding and Multiuser Diversity

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WIRELESS PERSONAL COMMUNICATIONS 2013年第4期72卷 2705-2720页

作者： Upadhyay, Prabhat K. Yadav, Suneel Indian Inst Technol Discipline Elect Engn Indore 452017 Madhya Pradesh India

We consider a cellular two-way relaying system in which a multi-antenna base station (BS) communicates bidirectionally with one of several single-antenna mobile stations (MSs) via a single-antenna relay using analog network coding. We employ MS selection coupled with beamforming at the BS so as to maximize the end-to-end signal-to-noise ratios. In the considered system, the target rates at the sources can generally be different owing to the asymmetric traffic flow in opposite directions. With such a general setup, we perform an overall system outage probability analysis over Rayleigh fading channels. For more insights, we derive a closed-form asymptotic expression for overall outage probability and an upper bound expression for ergodic sum-rate of the system. Based on these expressions, we show that the system achieves a performance gain, and a diversity order of minimum of the number of BS antennas and the number of MSs. Moreover, we address the problem of optimization of relay location in order to minimize the overall system outage under asymmetric traffic conditions. Finally, we provide numerical and simulation results to corroborate the theoretical analysis and the advantages offered by the proposed scheme.

关键词： analog network coding Beamforming Multiuser diversity Outage probability Rayleigh fading Two-way relaying

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Broadband analog network coding

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2010年第5期9卷 1577-1583页

作者： Gacanin, Haris Adachi, Fumiyuki Tohoku Univ Grad Sch Engn Sendai Miyagi 980 Japan

In this letter, we present the performance of broadband bi-directional transmission with analog network coding (ANC) in a frequency-selective fading channel. To cope with the channel frequency-selectivity we introduce the use of frequency domain equalization (FDE) with broadband ANC based on orthogonal frequency division multiplexing (OFDM) and single carrier (SC) radio access. We evaluate, by theory and computer simulation, the achievable bit error rate (BER) and ergodic capacity of bi-directional ANC scheme based on OFDM and SC-FDE radio access in a frequency-selective fading channel. Our results show that SC-FDE achieves a better BER performance, but on the other hand, a lower ergodic capacity in comparison with OFDM in a frequency-selective fading channel. Through both analysis and computer simulation, our findings show that a drawback of ANC scheme is its lack of diversity combining at the destination, which causes a slightly lower ergodic capacity in comparison with cooperative relaying irrespective of radio access scheme.

关键词： analog network coding frequency-selective fading OFDM SC FDE

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Energy-Efficient Relay Selection and Power Allocation for Two-Way Relay Channel with analog network coding

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IEEE COMMUNICATIONS LETTERS 2012年第6期16卷 816-819页

作者： Zhou, Min Cui, Qimei Jantti, Riku Tao, Xiaofeng Beijing Univ Posts & Telecommun Wireless Technol Innovat Inst Beijing 100876 Peoples R China Aalto Univ Sch Sci & Technol Dept Commun & Networking Helsinki Finland

In this letter, we consider a two-way relay channel (TWRC) with two end nodes and k relay nodes, where end nodes have the full channel-state information (CSI) and relay nodes only have the channel-amplitude information (CAI). With the objective of minimizing transmit power consumption at required end-to-end rates, energy-efficient relay selection (RS) and power allocation (PA) scheme is studied for TWRC based on analog network coding (ANC). Firstly, we propose an energy-efficient single RS and PA (E-SRS-PA) scheme, where the best relay node is selected to minimize total transmit power. Then, we prove that E-SRS-PA scheme is the optimal energy-efficient RS and PA (OE-RS-PA) scheme in ANC-based TWRC, and thus the optimal number of relay nodes to be selected in energy efficiency sense is equal to one. In addition, the closed-form expressions of optimal power allocation of E-SRS-PA scheme are derived. Numerical simulations confirm the optimality of proposed E-SRS-PA and demonstrate the energy efficiency of ANC-based TWRC compared with the other relaying schemes.

关键词： analog network coding two-way relay channel energy-efficient relay selection power allocation

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Outage-Optimal Allocation of Relay Power for analog network coding with Three Transmission Phases

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IEEE COMMUNICATIONS LETTERS 2012年第6期16卷 838-841页

作者： Park, Jae Cheol Song, Iickho Kim, Yun Hee Elect & Telecommun Res Inst Taejon 305606 South Korea Korea Adv Inst Sci & Technol Dept Elect Engn Taejon 305701 South Korea Kyung Hee Univ Dept Elect & Radio Engn Yongin South Korea

We consider a two-way relaying (TWR) system, where two user nodes communicate each other via a relay node adopting a three transmission phase (3P) analog network coding (ANC). In the 3P ANC, the relay node broadcasts a linear combination of the signals received from the two users in different phases. For the proposed scheme, we derive the outage optimal relay power allocation (RPA). When a direct link (DL) is available, we also propose a suboptimal RPA to avoid the requirement of feedback of the DL quality. Simulation results show that the 3P ANC with the suboptimal PRA, at a negligible loss compared to that with the optimal RPA, outperforms the other conventional schemes when a DL is available.

关键词： Two-way relaying analog network coding three phase protocol power allocation outage probability

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Performance of Three-Phase analog network coding with Relay Selection in Nakagami-m Fading

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IEEE COMMUNICATIONS LETTERS 2013年第8期17卷 1620-1623页

作者： Yadav, Suneel Upadhyay, Prabhat K. Indian Inst Technol Discipline Elect Engn Indore 452012 Madhya Pradesh India

In this letter, we investigate the performance of a two-way multi-relay system employing three-phase analog network coding (ANC) with best relay selection over independent and non-identically distributed Nakagami-m fading channels. Specifically, we derive a tight closed-form expression for the overall system outage probability. We also derive an asymptotic outage expression in high signal-to-noise ratio (SNR) regime, from which the diversity order and diversity-multiplexing trade-off are examined. In addition, we present an optimal relay power allocation to minimize the overall system outage. Numerical and simulation results validate the theoretical analysis and demonstrate the advantages offered by the considered scheme.

关键词： analog network coding outage probability Nakagami-m fading two-way relaying

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Power Provisioning and Relay Positioning for Two-Way Relay Channel With analog network coding

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IEEE SIGNAL PROCESSING LETTERS 2011年第9期18卷 517-520页

作者： Li, Yong Zhang, Xiang Peng, Mugen Wang, Wenbo Beijing Univ Posts & Telecommun Minist Educ Univ Wireless Commun Wireless Signal Proc & Network LabKey Lab Beijing 100876 Peoples R China

We consider two end users which have asymmetric traffic requirements in terms of both data rate and outage probability. They exchange information in Rayleigh flat-fading channels, and a half-duplex relay node is employed to assist the bidirectional communication between them, using the analog network coding (ANC) protocol. The provision of power levels for each node is investigated so as to minimize the total energy consumed to satisfy the asymmetric traffic requirements. By comparing energy consumptions between ANC strategy and direct transmission strategy, the relay operating region is also identified in which relay-assisted transmission can yield higher energy efficiency than direct transmission. It also indicates that the relay node is best positioned at the middle point of the two end nodes for any asymmetric traffic requirements from the perspective of energy consumption minimization.

关键词： analog network coding energy efficiency outage probability two-way relay

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Non-Regenerative Multi-Way Relaying: Space-Time analog network coding and Repetition

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IEEE COMMUNICATIONS LETTERS 2011年第12期15卷 1362-1364页

作者： Amah, Aditya Umbu Tana Klein, Anja Tech Univ Darmstadt Grad Sch Computat Engn Darmstadt Germany Tech Univ Darmstadt Commun Engn Lab D-64283 Darmstadt Germany

In this letter, we investigate non-regenerative multi-way relaying when channel state information is not available at the multi-antenna relay station (RS). For stationary channels, space-time analog network coding (STANC) transmission is applied at the RS. For non-stationary channels, the RS applies repetition transmission. For both transmission schemes, in order to obtain the data streams of the other nodes, each node has to perform three receive processing operations successively: Zero Forcing (ZF) detection, back-propagated self-interference cancellation and joint detection. We assess the achievable sum rate performance of non-regenerative multi-way relaying for the proposed transmission schemes. It is shown that STANC with joint detection outperforms both benchmark transmissions, namely, ZF and Maximisation of Signal to Noise Ratio (MSNR) transceive beamforming with single stream decoding performed at each node. When the channels are non-stationary, the repetition transmission enables the multi-way communication and in medium to high SNR region, it outperforms MSNR.

关键词： Multi-way relaying analog network coding space-time block code

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Joint MMSE designs for analog network coding and different MIMO relaying schemes: A unified approach and performance benchmarks

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PHYSICAL COMMUNICATION 2013年 6卷 62-73页

作者： Li, Jialing Lu, Enoch Lu, I-Tai NYU Polytech Inst Dept ECE New York NY 10003 USA Melville Grad Ctr Melville NY 11747 USA

To gain understanding of the analog network coding and different MIMO relaying schemes and to facilitate the scheme selection, there is a need for a unified approach and performance benchmarks. In this paper, analog network coding, direct transmission, Two-Hop relaying, and cooperative relaying schemes are analyzed and compared. A unified approach, the novel generalized iterative approach, is proposed for jointly designing the MMSE MIMO processors (including precoders, relay processors and decoders) for these schemes. Numerical results show that for each scheme, there exist system and channel parameter regime(s) where it is the most desirable among the four schemes. Performance benchmarks, physical insights and some guidelines for MIMO relaying scheme selection are presented. (C) 2012 Elsevier B.V. All rights reserved.

关键词： MIMO Direct transmission Two-Hop relaying Cooperative relaying analog network coding Joint MMSE design

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