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Noncoherent Detection for physical-layer network coding

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2018年第10期17卷 6901-6916页

作者： Wang, Zhaorui Liew, Soung Chang Lu, Lu Chinese Univ Hong Kong Dept Informat Engn Hong Kong Hong Kong Peoples R China Chinese Acad Sci Technol & Engn Ctr Space Utilizat Key Lab Space Utilizat Beijing 100094 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

This paper investigates the noncoherent detection in a two-way relay channel operated with physical-layer network coding (PNC), assuming FSK modulation and short-packet transmissions. For noncoherent detection, the detector has access to the magnitude but not the phase of the received signal. For conventional communication in which a receiver receives the signal from a transmitter only, the phase does not affect the magnitude, and hence the performance of the noncoherent detector is independent of the phase. PNC, on the other hand, is a multiuser system in which a receiver receives signals from multiple transmitters simultaneously. The relative phase of the signals from different transmitters affects the received signal magnitude through constructive-destructive interference. In particular, for good performance, the noncoherent detector of a multiuser system such as PNC must take into account the influence of the relative phase on the signal magnitude. Building on this observation, this paper delves into the fundamentals of PNC noncoherent detector design. To avoid excessive overhead, we assume a set-up in which the short packets in the PNC system do not have preambles. We show how the relative phase can be deduced directly from the magnitudes of the received data symbols, and that the knowledge of the relative phase thus deduced can in turn be used to enhance performance of noncoherent detection. Our overall detector design consists of two components: 1) a channel gains estimator that estimates channel gains without preambles;and 2) a detector that builds on top of the estimated channel gains to jointly estimate relative phase and detect data using a belief propagation algorithm. Numerical results show that our detector performs nearly as well as a "fictitious" optimal detector that has perfect knowledge of the channel gains and relative phase. Although this paper focuses on PNC with FSK modulation, we believe that the insight of this paper applies generally to non

关键词： physical-layer network coding noncoherent detection frequency shift keying short packet

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A Low Complexity physical-layer network coding Scheme for Cellular Two-Way Relaying Systems

A Low Complexity Physical-Layer Network Coding Scheme for Ce...

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23rd Wireless and Optical Communication Conference (WOCC)

作者： Fang, Zhaoxi Wang, Zunyi Zhang, Shaozhong Shi, Jiong Zhejiang Wanli Univ Fac Elect & Informat Engn Ningbo Zhejiang Peoples R China

ISBN: (纸本)9781479952496

In this paper, we consider transceiver design for multiuser cellular two-way relay network (cTWRC), where a multi-antenna base station (BS) exchanges information with multiple single-antenna mobile stations (MSs) with the help of a multi-antenna relay station (RS). We propose a low complexity two-way relaying scheme for cTWRC via signal space alignment. In our scheme, the precoders at the BS and MSs are jointly designed that the two data streams delivered to and from the same MS fall in the same spatial direction at the RS. With such signal space alignment, interference-free physical-layer network coding can be performed at the relay. We analyze the end-to-end sum bit error rate (BER) performance of the proposed scheme and investigate the optimal power allocation at the BS and RS to improve the BER performance. Numerical results demonstrate that our scheme is superior to the existing amplify-and-forward based signal alignment schemes.

关键词： Cellular two-way relaying signal space alignment physical-layer network coding power allocation

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Design of Coded Slotted ALOHA Operated with q-ary physical-layer network coding

Design of Coded Slotted ALOHA Operated with q-ary Physical-l...

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IEEE International Conference on Communications (IEEE ICC)

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

ISBN: (纸本)9781538674628

We study a physical-layer network coding (PNC) enhanced slotted ALOHA (SA) scheme. At the transmitters, practical q-ary modulation codes (a practical lattice code) and contention resolution diversity SA (CRDSA) protocol are utilized, where active users send replicas of their coded-modulated messages in randomly selected slots. At the receiver, q-ary linear PNC is employed to compute L network-coded messages (or linear message combinations), which can be regarded as a practical embodiment of compute-forward and lattice decoding. Upon collecting a sufficient number of network-coded messages, the receiver carries out generalized matrix inversion to recover a subset of all active users' messages. Numerical results demonstrate dramatically increased throughput performance by as much as 80%, as well as advances in the trade-offs among system load, latency and energy efficiency.

关键词： mMTC Slotted ALOHA lattice codes grant-free random access compute-forward physical-layer network coding

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Cooperative Communication with physical-layer network coding in Cognitive Radio network

Cooperative Communication with Physical-layer Network Coding...

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2nd International Conference on Instrumentation and Measurement, Computer, Communication and Control (IMCCC)

作者： Xu, Zhongwei Hou, Xiaoyun Wei, Hao Nanjing Univ Posts & Telecommun Inst Signal Proc & Transmiss Nanjing 210003 Jiangsu Peoples R China

ISBN: (纸本)9780769549354

Cognitive radio technology is a promising technology to solve the inefficiency problem of the usage of spectrum, and with the help of the cooperative communication technology, the system can obtain more performance. This paper proposes a cooperative communication strategy based on physical-layer network coding (PNC) to work out the difficulty that the primary cannot communicate, which the secondary user can also access the spectrum. Meanwhile, we also discuss the power allocation scheme and relay selection strategy to maximum the system capacity. With amplify forward (AF), the secondary forwards the signal after orthogonal zing the single of the primary user and the secondary user. Simulation results showed that, with the cooperation of the secondary user, the primary user can communicates efficiently;the secondary user transmits availably as well. The system achieves the best performance by the power allocation scheme and relay selection strategy.

关键词： cognitive radio physical-layer network coding cooperative communication

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An Optimal Transmit Power Allocation for the Two-Way Relay Channel Using physical-layer network coding

An Optimal Transmit Power Allocation for the Two-Way Relay C...

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IEEE International Conference on Communications (ICC 2009)

作者： Shin, Wonjae Lee, Namyoon Lim, Jong Bu Shin, Changyong Samsung Elect Co Ltd Samsung Adv Inst Technol Commun Lab Yongin 446712 Gyeonggi Do South Korea

ISBN: (纸本)9781424434367

A two-way relaying system using the physical-layer network coding (PNC) does not cause the spectral loss induced by the half-duplex signaling. Furthermore, when the total power, which is limited, is properly distributed to transmission nodes in such a system, the system capacity will be enhanced significantly. In this paper, we propose an optimal power allocation in the two-way relay channel employing the PNC protocol. The optimal power allocation is obtained by maximizing the achievable sum-rate of the PNC protocol under a sum-power constraint in a Rayleigh fading channel environment. Numerical experimental results confirm that the proposed power allocation scheme achieves much higher achievable sum-rate performance than the existing schemes.

关键词： Optimal Power Allocation physical-layer network coding Two-Way Relay Channel

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Joint Channel Estimation in physical-layer network coding with High-order Modulations 25

Joint Channel Estimation in Physical-layer Network Coding wi...

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25th Opto-Electronics and Communications Conference (OECC)

作者： Wang, Xuesong Qi, Wenchao Zhan, Yueying Chinese Acad Sci Technol & Engn Ctr Space Utilizat Key Lab Space Utilizat Beijing Peoples R China

we established the method to joint estimate the channel gains and the relative phase shift in PNC system under high-order modulations, and we get the result of less than 0.2% estimation error using training sequence.

ISBN: (纸本)9781728154459

关键词： physical-layer network coding channel gain estimation phase offset estimation training sequence

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Optimal Constellation Mapping for Pulse Amplitude Modulation Based Vertical physical-layer network coding

Optimal Constellation Mapping for Pulse Amplitude Modulation...

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International Conference on Information Science and Cloud Computing Companion (ISCC-C)

作者： Xu, Youyun Gao, Fengyue Xu, Kui Zhang, Jianfeng PLA Univ Sci & Technol Coll Commun Engn Nanjing 210007 Jiangsu Peoples R China

ISBN: (纸本)9781479952458

This paper discusses the denoise-and-forward (DNF) problem in two-way relay channel (TWRC). A pulse amplitude modulation (PAM) based vertical physical-layer network coding (VPNC) scheme is proposed and the optimal constellation mapping is studied to minimize the bit error rate (BER) and symbol error rate (SER) performance. Compared with the existing PNC scheme in which the relay superimposes two users' signals of the same constellation, two users in the proposed VPNC scheme transmit PAM signals with vertical constellation and the relay superimposes two signals of vertical constellation. The closed-form BER and SER expressions of the proposed VPNC scheme are also derived in this paper. Simulation results agree well with the theoretical analyses. Meanwhile, simulation results show that the proposed VPNC scheme outperforms the conventional PNC scheme on the SER and BER performance and optimal constellation mapping can obtain a about 1dB performance gain.

关键词： physical-layer network coding denoise-and-forward two-way relay channel vertical constellation mapping

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A physical-layer network coding Aware Distributed Scheduling Policy 13

A Physical-Layer Network Coding Aware Distributed Scheduling...

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13th International Wireless Communications and Mobile Computing Conference (IWCMC)

作者： Naves, Raphael Jakllari, Gentian Khalife, Hicham Conan, Vania Beylot, Andre-Luc Thales Commun & Secur Gennevilliers France IRIT INPT ENSEEIHT Toulouse France

ISBN: (纸本)9781509043729

physical-layer network coding (PLNC) was first introduced as a solution to increase the throughput in simple bidirectional communication schemes. Unlike most wireless communication techniques which try to avoid collisions, PLNC allows two simultaneous transmissions to a common receiver. In this work, we propose a MAC layer distributed and realistic scheduling policy targeting PLNC based networks. In order to easily operate in large ad-hoc networks, our solution is completely decentralized and runs in constant time. By basing the transmission priority of every node on the queue sizes of its local neighbors and PLNC opportunities, our solution ensures high throughput when compared to classical interference-free scheduling. Both our theoretical analysis corroborated by our simulation results highlight that the proposed algorithm outperforms existing scheduling policies with throughput gains of around 35%.

关键词： physical-layer network coding scheduling multi-hop networks

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Deep Neural networks Enhanced Phase Asynchronous physical-layer network coding 12

Deep Neural Networks Enhanced Phase Asynchronous Physical-La...

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12th International Conference on Cyber-Enabled Distributed Computing and Knowledge Discovery (CyberC)

作者： Wang, Xuesong Lu, Lu Univ Chinese Acad Sci Beijing Peoples R China Chinese Acad Sci Technol & Engn Ctr Space Utilizat Key Lab Space Utilizat Beijing Peoples R China

ISBN: (纸本)9798350331547

physical-layer network coding (PNC) is a promising technique in 6th-generation (6G) that can enhance the throughput of wireless communication systems, but it suffers from the performance loss because of relative phase offset that is brought by the asynchrony between different uplinks. Traditional way such as belief propagation (BP) that is used to solve the asynchrony needs estimated phases in uplinks as prior knowledge, and the computation complexity is high. In this paper, we propose a deep neural network (DNN) based PNC model that can deal with the phase asynchrony automatically and effectively without prior knowledge, and the system has small architecture that is easy to implement. Simulation results verify that our system has advantage of dealing with relative phase offset in PNC system under various modulation types.

关键词： physical-layer network coding deep neural network relative phase offset wireless communications

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Outage Performance Study of Cognitive Multi-Antenna Relay network with physical-layer network coding over Nakagami-m Fading Channels

Outage Performance Study of Cognitive Multi-Antenna Relay Ne...

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IEEE Military Communications Conference

作者： Zhu, Ying Liu, Jia Tao, XiaoYu Feng, Zhiyong Beijing Univ Posts & Telecommun Minist Educ Key Lab Univ Wireless Commun Beijing 100876 Peoples R China Guilin Univ Elect Technol Dept Teaching & Practicing Guilin 541004 Peoples R China Chongqing Jinmei Commun Co Ltd Chongqing 400030 Peoples R China

ISBN: (纸本)9780769551241

In this paper, we investigate the outage performance of physical-layer network coding (PNC) based cognitive multi-antenna relay network (CMRN) over the Nakagami-m channel. In the spectrum sharing systems, secondary users (SUs) are located on two different primary user (PU) coverage areas. Secondary transceiver nodes exchange their information with the assistance of a multi-antenna relay using PNC protocol. By applying the interference temperature (IT) constraints at the transceiver nodes and relay nodes in secondary systems, we analyze the outage performance in underlay spectrum sharing with the best relay selection criterion. The cumulative distribution function (CDF) of the signal to noise ratio (SNR) for each link are derived to obtain the tight upper bound on the outage probability of the secondary relay system. Simulations results demonstrate the validity and accuracy of the theoretical analysis.

关键词： Cognitive multi-antenna relay network outage probability physical-layer network coding Nakagami-m fading channel

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