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IEEE International Conference on Communications (ICC)

作者： Zhang, De-You Yu, Qi-Yue Meng, Wei-Xiao Li, Cheng Harbin Inst Technol Harbin Peoples R China Mem Univ St John NF AIB 3X Canada

ISBN: (纸本)9781479920037

The physical-layer network coding (PNC) has become a hot research topic, since it can potentially reduce the transmission time slots and increase the channel capacity. However, current studies are mainly concentrated on three nodes (two users and one relay) network. This paper considers a specific multiuser network that includes M (M>2) users with one relay, and illustrates the transmission scheme and evaluates its bit error rate (BER), information theoretical capacity and anti-noise performance under AWGN channel. Moreover, 2FSK is considered in the proposed network, since it does not need accurate phase tracking. Simulation results show that its information theoretical capacity would decrease significantly with the number of users in this network increase, however the capacity of the proposed scheme is still better than that of the IEEE802.11 networks.

关键词： physical-layer network coding multiuser network channel capacity asynchronous FSK

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Peak Age of Collection in Coordinated Direct and Relay Transmission with physical-layer network coding 99

Peak Age of Collection in Coordinated Direct and Relay Trans...

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IEEE 99th Vehicular Technology Conference (VTC-Spring)

作者： Meng, Guiyu Liu, Hai Chan, Tse-Tin Educ Univ Hong Kong Dept Math & Informat Technol Hong Kong Peoples R China Hang Seng Univ Hong Kong Dept Comp Sci Hong Kong Peoples R China

ISBN: (纸本)9798350387414

This paper investigates the information freshness of joint status updates, quantified by the age of collection (AoC), in uplink coordinated direct and relay transmission (CDRT). In an uplink CDRT setup, a direct sensor communicates directly with the destination, while a relay-aided sensor relies on a decode-and-forward relay. The update packet of each sensor contains partial information about a common observation target. The AoC measures the time elapsed since the generation of the latest set of update packets received at the destination. Hence, unlike the age of information (AoI) metric, the AoC decreases only when all update packets from multiple sources for a common observation are collected (i.e., a successful joint update). When simultaneous transmissions from the direct and relay-aided sensors cause packet collisions at the relay, conventional multiuser decoding (MUD) is usually used to decode native packets explicitly from the superimposed signals. Nevertheless, MUD does not work well when the signal-to-noise ratios (SNRs) of different sensors are (nearly) equal. To this end, this paper puts forth a physical-layer network coding (PNC)-aided CDRT scheme for joint information updating, utilizing both MUD and PNC decoders. The PNC decoder decodes superimposed signals into network-coded packets, particularly effective when the SNRs of different sensors are close. We design an automatic repeat request (ARQ) protocol tailored to low AoC and study how network-coded packets can be utilized to reduce the AoC of uplink CDRT, where the closed-form peak AoC formula is derived. We evaluate the PNC-aided CDRT scheme using software-defined radios. Experimental results show that our PNC-aided CDRT scheme significantly reduces the average peak AoC under various SNR conditions.

关键词： Age of collection age of correlated information age of information information freshness physical-layer network coding

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The Impact of CFO on OFDM based physical-layer network coding with QPSK Modulation

The Impact of CFO on OFDM based Physical-layer Network Codin...

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IEEE Wireless Communications and networking Conference (IEEE WCNC)

作者： Xie, Ling Fu Ho, Ivan Wang-Hei Situ, Zhenhui Li, Peiya Ningbo Univ Fac EECS Ningbo Peoples R China Hong Kong Polytech Univ Dept Elect & Informat Engn Hong Kong Peoples R China Jinan Univ Coll Cyber Secur Guangzhou Peoples R China

ISBN: (纸本)9781728131061

This paper studies physical-layer network coding (PNC) in a two-way relay channel (TWRC) operated based on OFDM and QPSK modulation but with the presence of carrier frequency offset (CFO). CFO, induced by node motion and/or oscillator mismatch, causes inter-carrier interference (ICI) that impairs received signals in PNC. Our ultimate goal is to empower the relay in TWRC to decode network-coded information of the end users at a low bit error rate (BER) under CFO, as it is impossible to eliminate the CFO of both end users. For that, we first put forth two signal detection and channel decoding schemes at the relay in PNC. For signal detection, both schemes exploit the signal structure introduced by ICI, but they aim for different output, thus differing in the subsequent channel decoding. We then consider CFO compensation that adjusts the CFO values of the end nodes simultaneously and find that an optimal choice is to yield opposite CFO values in PNC. Particularly, we reveal that pilot insertion could play an important role against the CFO effect, indicating that we may trade more pilots for not just a better channel estimation but also a lower BER at the relay in PNC. With our proposed measures, we conduct simulation using repeat-accumulate (RA) codes and QPSK modulation to show that PNC can achieve a BER at the relay comparable to that of point-to-point transmissions for low to medium CFO levels.

关键词： OFDM physical-layer network coding carrier frequency offset pilot insertion

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Adaptive Transmission Combining physical-layer network coding and Successive Interference Cancellation for Two-Way Relay System 6th

Adaptive Transmission Combining Physical-Layer Network Codin...

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6th International Conference on Communications, Signal Processing, and Systems (ICCSPS)

作者： Wang, Hailong Wang, Gang Li, Bo Harbin Inst Technol Commun Res Ctr Harbin Heilongjiang Peoples R China Harbin Inst Technol Weihai Sch Informat & Elect Engn Weihai Peoples R China

ISBN: (纸本)9789811065712;9789811065705

When two wireless terminals exchange information through an intermediate relay, physical-layer network coding (PNC) improves the spectrum efficiency by allowing concurrent message transmission. In two-way relay systems, the performance gain of PNC under practical limits has been investigated. The results show that generally the performance would be significantly degraded by channel impairments like asymmetric channel gain at the multiple-access phase. As an alternative interference exploitation scheme, successive interference cancellation (SIC) works well when multiple sources' signals have different power levels at the destination to successfully decoding. In this paper, an adaptive transmission scheme combing PNC and SIC is proposed for the two-way relay systems. Separate sum-rate simulation results for PNC and SIC show the opposite tendency with the channel impairment in two-way relaying, which means combining them would get a smooth sum-rate gain and let the system be more robust to dynamic scenarios.

关键词： Two-way relay system physical-layer network coding Successive interference cancellation Sum-rate

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On Linear physical-layer network coding with Non-Identical Modulation

On Linear Physical-Layer Network Coding with Non-Identical M...

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IEEE Wireless Communications and networking Conference (WCNC)

作者： Chen, Qiuzhuo Yang, Tao Beihang Univ Sch Elect Informat Engn Beijing 100191 Peoples R China

ISBN: (纸本)9781728195056

physical-layer network coding (PNC) is able to boost the error probability performance or throughput of a set of multi-source and multi-hop wireless networks. In this paper, we put forth a new asymmetric linear PNC (A-LPNC) scheme for the setup where the users are subject to non-identical power and modulation schemes. For deterministic channel, we show that given any unequal average symbol energy, the effective minimum distance of A-LPNC constellation can be made to be identical to the single-user minimum distance lower bound, translated into optimal error probability performance at a medium to high SNR. For fading channels, we show that the optimized network coding coefficients can be found and employed such that the effective minimum distance of A-LPNC is equal to the single-user minimum distance lower bound for integer channel gains. For real-valued channel gains, we present the optimal NC coefficients selection that minimizes the error probability of A-LPNC. These results are verified via simulations.

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

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Performance of physical-layer network coding in Asymmetric Two-Way Relay Channels

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China Communications 2013年第10期10卷 65-73页

作者：李博王钢 Peter H.J.Chong 杨洪娟 Yongliang GUAN 沙学军 Communication Research Center Harbin Institute of Technology Communication Research Center Harbin Institute of Technology School of Electrical and Electronic Engineering Nanyang Technological University

In this paper, we study the performance of physical-layer network coding in asymmetric two-way relay channels using four different cases having different poor channels:phase asymmetry, downlink asymmetry, uplink asymmetry and node asymmetry. The decision and mapping rule for symmetric and asymmetric cases are studied. The performance in terms of bit error rate for each case will be studied and analysed by computer simulation. Analytical and simulation results show that uplink asymmetry is the worst case;intra-phase asymmetry and unreliable uplink channels will more severely affect the performance degradation, which is caused by channel asymmetry.

关键词： physical-layer network coding two-way relay channels asymmetric channels bit error rate

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Distributed physical-layer network coding MAC protocol

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AD HOC networkS 2024年 153卷

作者： Aissaoui, Mohammed Houaidia, Chiraz Van Den Bossche, Adrien Val, Thierry Saidane, Leila Azouz Univ Manouba ENSI Manouba Tunisia Univ Toulouse Jean Jaures IRIT Toulouse France

physical-layer network coding (PNC) was first proposed for a Two-Way Relay Channel (TWRC) to improve the spectrum efficiency since it allows nodes to transmit simultaneously via a relay node. This technique requires multiple nodes to transmit their packets with accurate synchronization. Therefore, in many works of literature, centralized scheduling with perfect synchronization has been assumed to be employed on top of *** assumptions are not applicable in general random access multi-hop wireless networks. Therefore, this paper proposes a distributed MAC protocol that supports PNC in static multi-hop wireless networks. The proposed MAC protocol is based on the Carrier Sense Multiple Access (CSMA) strategy, where RTS/CTS frames are used to detect PNC opportunities and to offer the appropriate scheduling of the involved transmissions that should occur simultaneously. This packet exchange process is coordinated by the relay node and was designed to guarantee compatibility with other conventional relaying schemes with specific concerns for the hidden node issues. Our solution was practically tested on a real testbed with different static wireless topologies and several physical *** numerical results, we investigate the effectiveness of PNC in distributed wireless multi-hop networks. Compared to the conventional CSMA/CA and the PNC opportunistic (PNCOPP) MAC protocols, the proposed protocol's performances are advantageous in various scenarios, especially in large networks.

关键词： Multi-hop Wireless networks MAC protocol Carrier-Sensing Multiple Access physical-layer network coding Two-Way Relay Channel Software Defined Radio

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Inter-ONU-communication for future PON based on PAM4 physical-layer network coding

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OPTICS COMMUNICATIONS 2021年 497卷 127162-127162页

作者： Lu, Yang Deng, Hongsheng Hu, Linghuan Cao, Lufang Luo, Yuanhao Wang, Jinmeng Zhai, Yanrong Hangzhou Dianzi Univ Sch Commun Engn Hangzhou 310018 Peoples R China Taizhou Vocat Coll Sci & Technol Taizhou 318020 Peoples R China

A physical-layer network coding (PNC) based inter-ONU-communication (IOC) scheme is proposed for next generation high-speed PONs which apply four-level pulse amplitude modulation (PAM4). A 25 Gb/s full-duplex and priv... 详细信息

关键词： Inter-ONU-communication PAM4 physical-layer network coding

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Application of block Markov superposition transmission to physical-layer network coding for maritime communications

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physical COMMUNICATION 2019年 36卷 100833-000页

作者： Shi, Yao Cai, Suihua Ma, Xiao Sun Yat Sen Univ Sch Data & Comp Sci Guangzhou Guangdong Peoples R China Sun Yat Sen Univ Guangdong Key Lab Informat Secur Technol Guangzhou Guangdong Peoples R China

physical-layer network coding (PNC) is a promising technology that can improve the throughput of two-way relay networks. This paper focus on designing physical-layer network coding schemes for maritime communication systems. Unlike terrestrial environment, radio propagation at sea is seriously affected by wave movement, ship shaking and other complicated environmental factors. In order to improve the transmission reliability, we apply block Markov superposition transmission (BMST) to PNC schemes. Simulation results show that the proposed schemes outperform the existing convolutional coded PNC schemes over Rician channels, suggesting that the proposed schemes are more appropriate for marine applications. (C) 2019 Elsevier B.V. All rights reserved.

关键词： Block Markov superposition transmission Maritime communications physical-layer network coding Rician channels Two-way relay network

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When analog meets digital: Source-Encoded physical-layer network coding

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PERVASIVE AND MOBILE COMPUTING 2019年 58卷 101021-000页

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

We revisit physical-layer network coding (PLNC) in order to integrate this interference management technique in multi-hop wireless networks. We identify its strong coupling to the Two-Way Relay Channel (TWRC) as a main reason preventing it from becoming a staple in large networks. We introduce SE-PLNC (Source-Encoded PLNC), a new PLNC scheme that is traffic pattern independent and involves coordination only among one-hop neighbors, making PLNC significantly more practical to adopt in multi-hop wireless networks. To accomplish this, SE-PLNC introduces three innovations: it combines bit-level with physical-level network coding, it shifts most of the coding burden from the relay to the source of the PLNC scheme, and it leverages multi-path relaying opportunities available to a particular traffic flow. We evaluate SE-PLNC using proofof-concept implementation on a Universal Software Radio Peripherals (USRP) testbed, theoretical analysis, and simulations. Testbed experiments show its real-life feasibility over a wide range of different channel conditions. The theoretical analysis highlight the scalability of SE-PLNC and its efficiency in large ad-hoc networks while large-scale simulations show that SE-PLNC improves network throughput by over 30% compared to state-of-the-art PLNC schemes. (C) 2019 Elsevier B.V. All rights reserved.

关键词： Multi-hop wireless networks physical-layer network coding

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