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Joint decoder for network and channel coded multi-way relay systems with MPSK modulation

IET COMMUNICATIONS 2019年第15期13卷 2273-2279页

作者： Balasuriya, Nuwan Wavegedara, Chandika B. Univ Moratuwa Dept Elect & Telecommun Engn Moratuwa Sri Lanka HCT Abu Dhabi U Arab Emirates

In wireless sensor networks, multi-way relaying is a very common network configuration, where multiple nodes exchange information via a single relay over uncorrelated fading channels. In such configuration, node pair-wise communication together with physical-layer network coding (PNC) at the relay node provides a good trade-off between spectral efficiency and error performance. A joint channel decoding-PNC algorithm employed at the relay can further improve the bit error rate performance. This study proposes an improved joint channel decoding-PNC algorithm for M-ary phase shift keying modulated multi-way wireless relay systems. The proposed algorithm can achieve an additional diversity gain by exchanging bit-level or symbol-level soft information between the constitute decoders decoding different information pairs. Moreover, several schemes are proposed for exchange of the soft information between the parallely operating channel decoders. Simulation results demonstrate improved error and convergence performance of the proposed algorithm over the existing algorithms at the expense of non-significant increase in computational complexity.

关键词： fading channels network coding channel coding computational complexity phase shift keying wireless sensor networks diversity reception error statistics decoding relay networks (telecommunication) joint decoder MPSK modulation wireless sensor networks multiway relaying common network configuration uncorrelated fading channels node pair-wise communication physical-layer network coding relay node bit error rate performance improved joint channel decoding-PNC algorithm symbol-level soft information constitute decoders parallely operating channel decoders convergence performance information pairs bit-level soft-information M-ary phase shift keying modulated multiway wireless relay systems

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Outage Probability Analysis of Asymmetrical Bi-directional Multi-Relay System Based on network coding

Outage Probability Analysis of Asymmetrical Bi-directional M...

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2012 IEEE 14th International Conference on Communication Technology

作者： Wenwen Liang Wenfeng Ma Hua Tian Youyun Xu Kui Xu Institute of Communications Engineering PLA University of Science and Technology

ISBN: (纸本)9781467321006

In this paper,we construct a practical asymmetrical bi-directional multi-relay system model with considering the effect of distance between source nodes and destination *** two outage probability expressions of the system based on network coding and physical-layer network coding with decode- and-forward are *** analysis is proved correct by Monte Carlo *** we analyze the system average outage probability with different situations of power allocation coefficient,locations of the relay nodes,SNR and the number of relay nodes,indicating the inherent relationship between power allocation coefficient and total system power as well as the number of relay *** results indicate that the optimal power allocation coefficient of the system based on network coding and physical-layer network coding varies with respect to the distance between source nodes and destination nodes,and the outage probability of physical-layer network coding outperforms network coding ***,simulation results show that the system outage probability performance improves with the number of relay nodes increasing.

关键词： Asymmetrical Bi-directional Multi-relay System Outage Probability network coding physical-layer network coding Power Allocation Coefficient

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Compressed Relaying for Two-Way Relay networks With Correlated Sources

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IEEE WIRELESS COMMUNICATIONS LETTERS 2015年第1期4卷 30-33页

作者： Huo, Qiang Yang, Kun Song, Lingyang Li, Yonghui Jiao, Bingli Huawei Technol Co Ltd Phys Layer & RRM IC Algorithm Dept Shanghai Res Ctr Shanghai 201206 Peoples R China Peking Univ Sch Elect Engn & Comp Sci Beijing 100871 Peoples R China Univ Sydney Sch Elect & Informat Engn Sydney NSW 2006 Australia

In this letter, a compressed relaying scheme via Huffman and physical-layer network coding (HPNC) is proposed for two-way relay networks with correlated sources (TWRN-CS). In the HPNC scheme, both sources first transmit the correlated raw source messages to the relay simultaneously. The relay performs physical-layer network coding (PNC) on the received symbols, compresses the PNC-coded symbols using Huffman coding, and broadcasts the compressed symbols to both source nodes. Then, each source decodes the other source's messages by using its own messages as side information. Compression rate and block error rate (BLER) of the proposed scheme are analyzed. Simulation results demonstrate that the HPNC scheme can effectively improve the network throughput, and meanwhile, achieve the superior BLER performance compared with the conventional non-compressed relaying scheme in TWRN-CS.

关键词： Compression correlated bidirectional relay networks Huffman coding physical-layer network coding

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D-IRA Codes Over Integer Rings for Lattice-Based Multiple Access

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IEEE COMMUNICATIONS LETTERS 2024年第12期28卷 2719-2723页

作者： Zhang, Tianbo Yu, Fangtao Yang, Tao Liu, Rongke Beihang Univ Shenzhen Inst Shenzhen 518000 Peoples R China Beihang Univ Sch Elect & Informat Engn Beijing 100191 Peoples R China

We study capacity-approaching irregular repeat accumulate (IRA) codes over integer rings Z(2m) for 2(m)-PAM signaling, m=1,2,center dot center dot center dot. Such codes belong to the ensemble of lattice codes. First, the effect of zero-divisors on the iterative belief-propagation (BP) decoding is analyzed. We show that the symmetric Gaussian approximation is invalid for existing IRA codes over integer rings. Then we propose a new doubly IRA (D-IRA) ring code structure, which consists of irregular multiplier distribution and irregular node-degree distribution. Such structure can restore the symmetry and optimize the BP decoding threshold. Numerical result demonstrates the improved performance of D-IRA codes for AWGN channel. Also, it is demonstrated that the lattice based multiple-access scheme with D-IRA code performs within 3 dB the capacity limit.

关键词： Codes Vectors Lattices Modulation Structural rings Decoding Iterative decoding Symbols Receivers Optimization Coded modulation lattice codes physical-layer network coding compute-forward network information theory

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Practical NOMA-Based Coordinated Direct and Relay Transmission

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IEEE WIRELESS COMMUNICATIONS LETTERS 2021年第1期10卷 170-174页

作者： Pan, Haoyuan Liang, Jiaxin Liew, Soung Chang Shenzhen Univ Coll Comp Sci & Software Engn Shenzhen 518060 Peoples R China Chinese Univ Hong Kong Dept Informat Engn Hong Kong Peoples R China

This letter puts forth a practical non-orthogonal multiple access (NOMA)-based coordinated direct and relay transmission (CDRT) scheme, referred to as network-coded multiple access CDRT (NCMA-CDRT). We consider a two-user uplink scenario, where a near user communicates directly to a base station (BS), whereas a far user needs the assistance of a decode-and-forward relay. While prior NOMA-CDRT studies focused extensively on theoretical analysis, its superiority has not been well investigated through practical communication schemes. In particular, successive interference cancellation (SIC), a predominant NOMA decoding technique, does not work well if transmitters with comparable received powers transmit together. We investigate NCMA-CDRT to tackle this practical issue. A distinguishing feature of NCMA-CDRT is the joint use of physical-layer network coding (PNC) and multiuser decoding at both the relay and the BS. We design packet relaying strategies that can forward the PNC packets decoded at the relay to boost system throughput. Experiments on software-defined radio indicate that the total throughput of NCMA-CDRT significantly outperforms the SIC-based NOMA-CDRT. Overall, NCMA-CDRT is a viable solution for cooperative NOMA systems.

关键词： Non-orthogonal multiple access physical-layer network coding cooperative NOMA implementation

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Degrees of Freedom of a MIMO Multipair Two-Way Relay Channel With Delayed Channel State Information

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IEEE SIGNAL PROCESSING LETTERS 2018年第2期25卷 243-247页

作者： Wang, Rui Yuan, Xiaojun Wu, Jun Tongji Univ Sch Elect & Informat Engn Shanghai 201804 Peoples R China Univ Elect Sci & Technol China Natl Key Lab Sci & Technol Commun Chengdu 610051 Sichuan Peoples R China

We study the degrees of freedom (DoFs) of a multiple-input multiple-output K-pair two-way relay channel with delayed channel state information (CSI) with J distributed relays. In the considered model, we assume that the users are equipped with M antennas and the relay with N antennas. We propose two schemes, where the signaling design can be carried out either in each individual time slot or across multiple time slots with and without knowledge of CSI. The scheme involves a joint design of user beamforming matrices, relay beamforming matrices, and user postprocessing matrices, so as to meet interference neutralization and rank conditions. We show that the optimal DoF of N/2K per user can be reached for M/N >= 1 for an arbitrary number of user pairs when J = 1. This implies that delayed CSI does not compromise the DoF performance of the considered model when M/N >= 1.

关键词： Degrees of freedom physical-layer network coding two-way relay channel

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Noncoherent Two-Way Relaying With Decode and Forward: Two Versus Three Phases

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2022年第3期71卷 3350-3354页

作者： Wei, Ruey-Yi Chin, Wan-Ying Feng, Tian-Yu Natl Cent Univ Dept Commun Engn Taoyuan Taiwan Good Will Instrument Co Ltd New Taipei Taiwan Chroma ATE Inc Taoyuan Taiwan

Noncoherent two- and three-phase two-way relaying (TWR) techniques are bandwidth efficient and entail no pilot symbol-related rate loss. However, noncoherent two-phase TWR (2P-TWR) has not been compared with three-phase TWR (3P-TWR), and several unanswered questions remain. In this paper, we focus on the noncoherent detection of the relay with the decode-and-forward technique. For the noncoherent maximum-likelihood detector at the relay, we propose a distance measure for the transmitted signals of the two terminal nodes. For 2P-TWR, we propose that the signal constellation of one terminal node is the signal constellation of the other terminal node rotated by an angle. Using the proposed distance measure, we obtain the optimal angles and thus resolve those unanswered questions pertaining to 2P-TWR. Finally, noncoherent 3P-TWR was found to significantly outperform noncoherent 2P-TWR in simulations and distance analyses.

关键词： Relays Binary phase shift keying Constellation diagram MIMO communication Encoding network coding Error probability Differential encoding noncoherent detection MPSK physical-layer network coding two-way relaying

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On the Design of Repetition-Based Slotted ALOHA Operated With q-Ary Compute-Forward

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2024年第10期73卷 15675-15680页

作者： Yang, Tao Xi, Zhiyu Ren, Wencheng Yu, Fangtao Beihang Univ Beijing 100191 Peoples R China

This correspondence studies slotted ALOHA (SA) operated with q-ary compute-forward (CF) for grant-free random access. At the transmitters, a practical q-ary channel code and repetition SA (RSA) protocol are utilized, where users send replicas of their coded-modulated packets in randomly selected slots. At the receiver, practical q-ary linear physical-layer network coding is employed to compute and stores a number of network-coding (NC) message streams per slot. Upon collecting a sufficient amount of NC message streams from a number of consecutive slots, the receiver carries out generalized matrix inversion (GMI) to recover the users' messages. We demonstrate that the developed scheme exhibits dramatically increased throughput by as much as 80%. Furthermore, thanks to GMI, there is no need to wait till the end of the frame for decoding, leading to slashed processing delay in RSA.

关键词： Receivers Wireless communication Throughput Streams Codes Protocols Multiuser detection mMTC Slotted ALOHA NOMA grant-free random access compute-forward physical-layer network coding

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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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