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MAC for physical-layer network coding in VANETs

INTERNATIONAL JOURNAL OF BUSINESS DATA COMMUNICATIONS AND networkING 2012年第4期8卷 84-106页

作者： Ndih, Eugene David Ngangue Cherkaoui, Soumaya Univ Sherbrooke Dept Elect & Comp Engn Sherbrooke PQ Canada

In this paper, the authors present VPNC-MAC, a PNC-based MAC protocol for efficient and reliable periodic beacon broadcasts in VANETs. In addition to PNC-based scheduled transmissions, VPNC-MAC makes use of CSMA/CA to ensure fairness and flexibility with transmissions from CSMA-based nodes. VPNC-MAC consists of two phases: In the setup phase, a quasi-optimal mechanism of selecting a relay node is proposed to take into account both the position, and the remaining time the relay needs for delivering its current beacon. In the packet exchange phase, they define two priority modes to deal with the cohabitation of both the CSMA-based and the VPNC-based nodes, and also with unpredictable events such as emergency broadcasts. Contrary to the high-priority mode, the VPNC-based nodes AIFS in the low-priority mode is set such that the medium access is granted prior to CSMA-based nodes. Simulations results show that the global PRR in high-priority mode outperforms existing MAC.

关键词： Dedicated Short-Range Communication (DSRC/802.11p) MAC Periodic Broadcast physical-layer network coding Reliability Vehicular Ad-Hoc networks (VANETs)

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Asymptotically Optimal Error-Rate Performance of Linear physical-layer network coding in Rayleigh Fading Two-Way Relay Channels

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IEEE COMMUNICATIONS LETTERS 2012年第7期16卷 1068-1071页

作者： Yang, Tao Collings, Iain B. CSIRO WNTL Sydney NSW Australia

We study a new linear physical-layer network coding (LPNC) scheme for fading two-way relay channels. In the uplink phase, two users transmit simultaneously. The relay selects some integer coefficients and computes a linear combination (in a size-q finite set) of the two users' messages, which is broadcast in the downlink phase. We develop a design criterion for choosing the integer coefficients that minimizes the error probability. Based on that, we derive an asymptotically tight bound, in a closed-form, for the error probability of the LPNC scheme over Rayleigh fading channels. Our analysis shows that the error-rate performance of the LPNC scheme becomes asymptotically optimal at a high SNR, and our designed LPNC scheme significantly outperforms existing schemes in the literature.

关键词： physical-layer network coding compute-and-forward code design relay channel

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Serially Concatenated CPM in Two-Way Relay Channels with physical-layer network coding

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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 2019年第7期E102A卷 934-937页

作者： Sha, Nan Chen, Lihua Gao, Yuanyuan Guo, Mingxi Xu, Kui Army Engn Univ PLA Commun Engn Coll Nanjing 210007 Jiangsu Peoples R China

A physical-layer network coding (PNC) scheme is developed using serially concatenated continuous phase modulation (SCCPM) with symbol interleavers in a two-way relay channel (TWRC), i.e., SCCPM-PNC. The decoding structure of the relay is designed and the corresponding soft input soft output (SISO) iterative decoding algorithm is discussed. Simulation results show that the proposed SCCPM-PNC scheme performs good performance in bit error rate (BER) and considerable improvements can be achieved by increasing the interleaver size and number of iterations.

关键词： physical-layer network coding serially concatenated continuous phase modulation soft input soft output

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High-Order Modulation Based on Deep Neural network for physical-layer network coding

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IEEE WIRELESS COMMUNICATIONS LETTERS 2021年第6期10卷 1173-1177页

作者： Park, Jinsol Ji, Dong Jin Cho, Dong-Ho Korea Adv Inst Sci & Technol Sch Elect Engn Daejeon 34141 South Korea

physical-layer network coding (PNC) is an effective technique for enhancing wireless network throughput. Recently, it has been demonstrated that convolutional autoencoders effectively works in point-to-point communication systems, but their application to wireless relay networks is scarcely explored. In this letter, we propose a convolutional autoencoder for PNC in a two-way relay channel. The constellation mapping and demapping of symbols at each node are determined adaptively through a deep learning technique, such that the bit error rate performance is improved for high-order modulation. Simulation results verify the advantages of the proposed scheme over the conventional PNC scheme for various modulation types.

关键词： Relays Modulation Convolutional codes Convolution Training Simulation Entropy Autoencoder deep learning physical-layer network coding quadrature amplitude modulation

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A Novel Reconfigurable Mapping of physical-layer network coding With M-QAM

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IEEE COMMUNICATIONS LETTERS 2024年第1期28卷 4-8页

作者： Yuan, Menglian Tang, Meng Li, Jiaqi Wang, Hao Yu, Yongtao Yunnan Univ Sch Informat Sci & Engn Kunming 650504 Peoples R China Yuxi Normal Univ Sch Math & Informat Technol Yuxi 653100 Peoples R China

In this letter, a novel reconfigurable mapping (RM) scheme for a physical-layer network coding (PNC) system based on M-ary quadrature amplitude modulation (M-QAM) is proposed. To solve the ambiguity problem, key expressions were given in our system, efficient algorithms were designed, and corresponding mapping rule tables were developed. This technique offers significant advantages over other technologies. Simulation results demonstrate that the RM-16QAM scheme provides a gain of 2.4 dB compared to alternative schemes, while the RM-64QAM strategy confers a notable gain of 6.3 dB over the conventional scheme.

关键词： physical-layer network coding high-order modulation M-QAM reconfigurable mapping

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Achieving Diversity for physical-layer network coding Based Two-Way Multiple-Antenna Relay: A Two-Phase Diversity Scheme

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IEICE TRANSACTIONS ON COMMUNICATIONS 2011年第12期E94B卷 3382-3386页

作者： Gao, Hui Su, Xin Lv, Tiejun Cao, Ruohan Wang, Taotao BUPT Beijing 100876 Peoples R China TNList Beijing 100084 Peoples R China

We propose a two-phase diversity scheme to achieve the end-to-end spatial diversity gain for physical-layer network coding (PNC) based two-way relay with a multiple-antenna relay node. A novel binary PNC-specific maximal-ratio-combining like (MRC-L) scheme is proposed to obtain receive diversity in the multiple-access (MA) phase with linear complexity;the Max-Min criterion based transmit antenna selection (TAS) is adopted to obtain transmit diversity in the broadcast (BC) phase. Both the brief diversity analysis and the Monte Carlo (MC) simulation results demonstrate that the proposed scheme achieves full diversity and outperforms other comparable schemes in terms of end-to-end diversity or power advantage.

关键词： physical-layer network coding two-way relay multiple-antenna relay diversity

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Joint CPFSK Modulation and physical-layer network coding in Two-Way Relay Channels

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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 2014年第4期E97A卷 1021-1023页

作者： Sha, Nan Gao, Yuanyuan Yi, Xiaoxin Li, Wenlong Yang, Weiwei PLA Univ Sci & Technol Coll Commun Engn Nanjing 210007 Jiangsu Peoples R China

A joint continuous phase frequency shift keying (CPFSK) modulation and physical-layer network coding (PNC), i.e., CPFSK-PNC, is proposed for two-way relay channels (TWRCs). This letter discusses the signal detection of the CPFSK-PNC scheme with emphasis on the maximum-likelihood sequence detection (MLSD) algorithm for the relay receiver. The end-to-end error performance of the proposed CPFSK-PNC scheme is evaluated through simulations.

关键词： physical-layer network coding continuous phase frequency shift keying modulation index maximum-likelihood sequence detection

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On the relay selection for cooperative wireless networks with physical-layer network coding

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WIRELESS networkS 2012年第6期18卷 653-665页

作者： Zheng, Zeyu Fu, Shengli Lu, Kejie Wang, Jianping Chen, Biao Univ N Texas Dept Elect Engn Denton TX 76207 USA City Univ Hong Kong Dept Comp Sci Hong Kong Hong Kong Peoples R China Univ Puerto Rico Dept Elect & Comp Engn Mayaguez PR 00681 USA Univ Macau Fac Sci & Technol Dept Comp & Informat Sci Macau Peoples R China

In this paper, we investigate a large cooperative wireless network with relay nodes, in which cooperation is enabled through physical-layer network coding (PLNC). Specifically, we study the impact of the relay selection on the network capacity with power constraints in two scenarios. First, we consider the basic PLNC model (a.k.a., the ARB model), in which one pair of source nodes (A, B) exchange messages via a selected relay node (R). Given the power constraint, we derive the optimal relay selection and power allocation that maximize the sum capacity, defined as the summation of the capacity for two source-destination channels. Based on results obtained above, we then consider a more general scenario with multiple pairs of source nodes. Assuming the constant power constraint, we derive the upper bound of the minimal sum capacity of any source pair. The optimal power allocation among multiple source pairs is also derived. To validate these theoretical results, we also provide two relay selection strategies: a modified optimal relay assignment strategy and a novel middle point strategy for maximizing the minimal sum capacity of any source pair.

关键词： physical-layer network coding The ARB model Relay selection Power constraints Sum capacity

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Synchronization Analysis for Wireless TWRC Operated with physical-layer network coding

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WIRELESS PERSONAL COMMUNICATIONS 2013年第3期68卷 637-653页

作者： Zhang, Shengli Liew, Soung-Chang Wang, Hui Shenzhen Univ Dept Commun Engn Shenzhen Peoples R China Chinese Univ Hong Kong Dept Informat Engn Hong Kong Hong Kong Peoples R China

physical-layer network coding (PNC) makes use of the additive nature of the electromagnetic waves to apply network coding arithmetic at the physical layer. With PNC, the destructive effect of interference in wireless networks is eliminated and the capacity of networks can be boosted significantly. This paper addresses a key outstanding issue in PNC: synchronization among transmitting nodes. We first investigate the impact of imperfect synchronization in a 3-node network with a straightforward detection scheme. It is shown that with QPSK modulation, PNC on average still yields significantly higher capacity than straightforward network coding when there are synchronization errors. Significantly, this remains to be so even in the extreme case when synchronization is not performed at all. Moving beyond a 3-node network, we propose and investigate a synchronization scheme for PNC in a general chain network. And we argue that if the synchronization errors can be bounded in the 3-node case, they can also be bounded in the general N-node case. Lastly, we present simulation results showing that PNC is robust to synchronization errors. In particular, for the mutual information performance, there is about 2 dB loss without phase or symbol synchronization.

关键词： physical-layer network coding Wireless networks Synchronization

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On Symbol Mapping for Binary physical-layer network coding with PSK Modulation

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2012年第1期11卷 21-26页

作者： Noori, Moslem Ardakani, Masoud Univ Alberta Dept Elect & Comp Engn Edmonton AB T6G 2M7 Canada

In a system employing physical-layer network coding, the superimposed constellation at the relay may have ambiguity where one received signal is associated with more than one possible combination of users' data. We find the necessary and sufficient condition on a user bit mapping which removes this ambiguity for phase shift keying modulation. Further, we introduce the concept of semi-Gray mapping which improves the system BER performance and achievable rate. The necessary and sufficient condition of having a semi-Gray mapping is also found. Interestingly, the widely used binary reflected Gray mapping does not satisfy the semi-Gray mapping condition resulting in a poorer performance compared to our proposed semi-Gray scheme.

关键词： physical-layer network coding PSK modulation symbol mapping minimum Euclidean distance

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