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IEEE Global Communications Conference

作者： Ya-Tian Li Qi-Yue Yu Kai He Wei Xiang Communications Research Center Harbin Institute of Technology School of Electronic and Information Engineering Xi'an Jiaotong University School of Mechanical and Electrical Engineering University of Southern Queensland

ISBN: (纸本)9781479959532

The physical-layer network coding (PNC) becomes a popular research topic, and the multiuser PNC network is still an open issue. This paper investigates the uniquely-decodable codes (UDC) by using Iterative construction algorithm, and applies the generated UDC to the multiuser PNC network that based on amplify-and-forward (AF) criterion. Due to the attractive features of UDC, the sum data rate can increase with the number of users log-linearly. Moreover, only two time slots are needed for any user node to obtain the data sequences transmitted by an arbitrary user, no matter of the users' number. It is also illustrated that the theoretical bit error rate (BER) of the proposed scheme, which can compare with the traditional PNC scheme in both simulated and theoretical results.

关键词： physical-layer network coding Multiuser network Uniquely-decodable codes Amplify-and-forward PNC hierarchical network physical layer network coding data sequence Bit error rate Codes Consumers

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Analysis of physical-layer network coding over Asymmetric Two-way Relay Channel with Carrier Frequency Offset

Analysis of Physical-layer Network Coding over Asymmetric Tw...

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IEEE/CIC International Conference on Communications in China

作者： Shouxin Zong Shaoshuai Gao School of Electronic Electrical and Communication Engineering University of Chinese Academy of Sciences Beijing China

ISBN: (纸本)9781509002443

The physical-layer network coding (PNC) can greatly improve the throughput of wireless network communications. However, critical synchronization in both time domain and frequency domain is required. Orthogonal frequency division multiplexing (OFDM) solves the problem of the synchronization in time domain while more critical synchronization in frequency domain is required. In this paper, we investigate the inter-channel interference (ICI) issue for OFDM-based physical-layer network coding (FPNC) over the two-way relay channel (TWRC). An approximate formula that calculates the ICI is derived. The compensation frequency, used by intermediate node to obtain minimal ICI power, has also been calculated. We find that average compensation is the optimal compensation method in the symmetric TWRC system while a different compensation method should be adopted in the asymmetric TWRC system. In addition, it is observed that bit error rate (BER) performance is not only decided by the power of the ICI but also by the distribution of it. At last, numerical results indicate that our approximate formula is accurate enough to calculate the ICI and can be applied to other OFDM systems.

关键词： physical-layer network coding carrier frequency offset inter-channel interference two-way relay channel carrier frequency offset Interchannel interference relay channel compensation method hierarchical network ICI physical layer approximate formula network coding TIME-DOMAIN Frequency-domain analysis Orthogonal frequency division multiplexing two-way channel intermediate node

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On the Optimal Design and Performance of Linear physical-layer network coding for Fading Two-Way Relay Channels

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2014年第2期13卷 956-967页

作者： Yang, Tao Collings, Iain B. Univ New S Wales Sch Elect Engn & Telecommun Sydney NSW 2052 Australia CSIRO CCI Canberra ACT Australia

The design of a reliable physical-layer network coding (PNC) scheme for practical fading two-way relay channels is a challenging task. This is because the signals transmitted by two users arrive at the relay with varied amplitudes and a relative carrier-phase offset, which will impair the performance of PNC. This paper studies a linear PNC scheme for fading two-way relay channels where the transmitters lack the channel state information. In this scheme, the relay computes and broadcast some finite-set integer combinations of two users' messages. The coefficients for the integer combinations used at the relay are carefully designed to minimize the error probability. This scheme can be viewed as a practical embodiment of the compute-and-forward concept. We develop a new LPNC design criterion called minimum set-distance maximization. Using this criterion, we derive an explicit expression for the optimized integer coefficients that minimizes the error probability of LPNC. The optimized integer coefficients turn out to resemble the fading channel coefficients. We further derive a closed-form expression on the average error probability performance over a complex-valued Rayleigh fading two-way relay channel, which shows that our designed LPNC scheme approaches the optimal error performance at a high SNR. Numerical results show that our designed LPNC outperforms existing schemes by more than 5 dB at a medium-to-high SNR regime.

关键词： network coding physical-layer network coding compute-and-forward distance property

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Design and Analysis of Multi-Level physical-layer network coding for Gaussian Two-Way Relay Channels

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IEEE TRANSACTIONS ON COMMUNICATIONS 2014年第6期62卷 1803-1817页

作者： Chen, Zhiyong Xia, Bin Hu, Zixia Liu, Hui Shanghai Jiao Tong Univ Dept Elect Engn IWCT Shanghai 200240 Peoples R China Qualcomm San Jose CA 95110 USA

In this paper, we propose a multi-level physical-layer network coding (MPLNC) scheme that optimizes the relay performance for both symmetric and asymmetric traffic in a Gaussian two-way relay channel. The proposed MPLNC scheme enables each source to employ multiple linear binary codes for encoding, one per modulation level, and the relay node to decode superimposed network codewords at each modulation level. We first derive the achievable rate for the transmission of arbitrary constellations and then prove that MPLNC with multistage decoding (MPLNCMSD) can achieve the achievable rate if binary code rates are properly chosen for both sources. Furthermore, the design criteria for the proposed MPLNC scheme is investigated, which includes the rate design rule and the labeling strategy. Moreover, we derive the error exponent and an upper bound of the overall error probability for MPLNC. Our analysis and simulation results show that MPLNCMSD has a significant performance advantage in comparison to the existing bit-interleaved coded modulation (BICM)-based PLNC scheme.

关键词： Two-way relay channels multilevel coding physical-layer network coding symmetric and asymmetric relaying error exponent

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MSK Modulation for physical-layer network coding Systems

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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 2014年第10期E97A卷 2086-2089页

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

In this letter, we combine minimum-shift keying (MSK) with physical-layer network coding (PNC) to form a new scheme, i.e.. MSK-PNC, for two-way relay channels (TWRCs). The signal detection of the MSK-PNC scheme is investigated, and two detection methods are proposed. The first one is orthogonal demodulation and mapping (ODM), and the second one is two-state differential detection (TSDD). The error performance of the proposed MSK-PNC scheme is evaluated through simulations.

关键词： physical-layer network coding minimum-shift keying two-way relay channel multiple access

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Joint Channel Estimation and Channel Decoding in physical-layer network coding Systems: An EM-BP Factor Graph Framework

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2014年第4期13卷 2229-2245页

作者： Wang, Taotao Liew, Soung Chang Chinese Univ Hong Kong Dept Informat Engn Hong Kong Hong Kong Peoples R China

This paper addresses the problem of joint channel estimation and channel decoding in physical-layer network coding (PNC) systems. In PNC, multiple users transmit to a relay simultaneously. PNC channel decoding is different from conventional multi-user channel decoding: specifically, the PNC relay aims to decode a network-coded message rather than the individual messages of the users. Although prior work has shown that PNC can significantly improve the throughput of a relay network, the improvement is predicated on the availability of accurate channel estimates. Channel estimation in PNC, however, can be particularly challenging because of 1) the overlapped signals of multiple users;2) the correlations among data symbols induced by channel coding;and 3) time-varying channels. We combine the expectation-maximization (EM) algorithm and belief propagation (BP) algorithm on a unified factor-graph framework to tackle these challenges. In this framework, channel estimation is performed by an EM subgraph, and channel decoding is performed by a BP subgraph that models a virtual encoder matched to the target of PNC channel decoding. Iterative message passing between these two subgraphs allow the optimal solutions for both to be approached progressively. We present extensive simulation results demonstrating the superiority of our PNC receivers over other PNC receivers.

关键词： physical-layer network coding expectation-maximization belief propagation factor graph message passing

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Combined orthogonal physical-layer network coding over fading two-way relay channels

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INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS 2014年第12期27卷 4265-4279页

作者： Li, Bo Chong, Peter Han Joo Wang, Gang Yang, Hongjuan Guan, Yongliang Harbin Inst Technol Commun Res Ctr Harbin 150080 Peoples R China Nanyang Technol Univ Sch Elect & Elect Engn Singapore 639798 Singapore

This paper proposes a new physical-layer network coding (PNC) scheme, named combined orthogonal PNC (COPNC), for fading two-way relay channels. The scheme is based on orthogonal PNC (OPNC). In the scheme, the two source nodes employ orthogonal carriers, and the relay node makes an orthogonal combining of the two information bits rather than exclusive or (XOR), which is employed in most PNC schemes. The paper also analyzes the bit error rate (BER) performance of PNC, OPNC, and COPNC for Rayleigh fading model. Simulation results for Rayleigh and Nakagami-m fading channels show that COPNC can provide outstanding BER performance compared with PNC and OPNC, especially when the uplink channel conditions are asymmetric. The results in Nakagami-m channels also imply that COPNC will provide higher BER gain with more severe fading depth. Potential works about COPNC are also presented in this paper. Copyright (c) 2013 John Wiley & Sons, Ltd.

关键词： two-way relay channels physical-layer network coding combined physical-layer network coding orthogonal combining

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Linear physical-layer network coding Over Hybrid Finite Ring for Rayleigh Fading Two-Way Relay Channels

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IEEE TRANSACTIONS ON COMMUNICATIONS 2014年第9期62卷 3249-3261页

作者： Fang, Dong Burr, Alister Yuan, Jinhong Univ York Dept Elect York YO10 5DD N Yorkshire England Univ New S Wales Sch Elect Engn & Telecommun Sydney NSW 2052 Australia

In this paper, we propose a novel linear physical-layer network coding scheme over hybrid finite ring (HFR-LPNC) for Rayleigh fading two-way relay channels. The relay maps the superimposed signal of the two users to a linear network coded combination (LNCC) in hybrid finite ring, rather than using the simple bit-wise eXclusive-OR mapping. The optimal linear coefficients are selected to generate the LNCC, aiming to: 1) maximize the sum-rate in the MAC phase;and 2) ensure unambiguous decoding. To avoid the performance degradation caused by high-order irregular mappings, properly designed source coding is used for compressing the LNCC alphabet over the hybrid finite ring into the unifying 4-ary alphabet. We derive the constellation constrained sum-rates for HFR-LPNC in comparison with 5QAM denoise-and-forward (5QAM-DNF), which we use as a reference scheme. Furthermore, we explicitly characterize the rate difference between HFR-LPNC and 5QAM-DNF. Our analysis and simulation show that: 1) HFR-LPNC has a superior ability to mitigate the singular fading compared with 5QAM-DNF;and 2) HFR-LPNC is superior to 5QAM-DNF over a wide range of SNRs.

关键词： physical-layer network coding two-way relay channels constellation constrained capacity finite ring

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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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Hexagonal Constellations for Adaptive physical-layer network coding 2-Way Relaying

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IEEE COMMUNICATIONS LETTERS 2014年第2期18卷 217-220页

作者： Hekrdla, Miroslav Sykora, Jan Czech Tech Univ CR-16635 Prague Czech Republic

We focus on a constellation design for adaptive physical-layer network coding strategy in a wireless 2-way relay channel. It is well known that 4QAM constellations require extended-cardinality network coding adaptation to avoid all singular channel parameters at the Multiple-Access (MA) stage. The cardinality extension is undesirable since it introduces redundancy decreasing the data rates at the broadcast stage. In this paper, we target a design of constellations avoiding all the singularities without the cardinality extension. We show that such a constellation is 4-ary constellation taken from hexagonal lattice (4HEX) which keeps comparable error performance at the MA stage as 4QAM, however without the cardinality extension. The similar properties has been found also by unconventional 3HEX and 7HEX constellations.

关键词： physical-layer network coding constellation design wireless two-way relaying

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