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29th Wireless and Optical Communications Conference (WOCC)

作者： Wang, Xuesong He, Yuna Sun, Yang Zhan, Yueying Chinese Acad Sci Technol & Engn Ctr Space Utilizat Key Lab Space Utilizat Beijing Peoples R China

ISBN: (纸本)9781728161242

In this paper, we first propose the Automatic Modulation Classification (AMC) problem based on the physical layer network coding (PNC) system and elaborate in detail. We use Convolutional Neural networks (CNN) to identify nine cases including three modulation formats with three phase shifts respectively, and estimate the Signal-to-Noise Ratio (SNR) simultaneously. As the result, we correctly identify several modulation formats and typical phase offsets with a 100% recognition rate, and estimate the received signal-to-noise ratio effectively with recognition rate above 98%.

关键词： automatic modulation classification physical layer network coding convolutional neural network constellation map

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System-level Simulation of Multihop Wireless networks using physical-layer network coding

System-level Simulation of Multihop Wireless Networks using ...

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European Conference On networks And Communications (EuCNC)

作者： Burr, Alister Chen, Cheng Molu, Mehdi Ramantas, Kostas Vardakas, John S. Univ York Dept Elect York N Yorkshire England IQUADRAT Barcelona Spain

ISBN: (纸本)9781467373593

We discuss the system-level simulation of an ultradense, multi-hop wireless network employing physical layer network coding to increase its throughput and eliminate the effect of interference between links in the network. We describe the network paradigm being developed by the DIWINE project, and the principles of physical layer network coding. The system-level simulator (SLS) operates on a packet level, and determines packet error probability for the network coded data at each relay in terms of the noise power and the signal level from each incoming link. We describe this simulation methodology and the software package used to implement it, and give numerical results for throughput versus load for a simple example network, showing that the approach developed by DIWINE outperforms a simple TDMA baseline scheme under most conditions.

关键词： system-level simulation physical layer network coding hierarchical decode and forward

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Mapping and coding Design for Channel Coded physical-layer network coding

Mapping and Coding Design for Channel Coded Physical-layer N...

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International Workshop on High Mobility Wireless Communications

作者： Li, Xu Zhang, Shengli Qian, Gongbin Shenzhen Univ Coll Informat Engn Dept Commun Engn Shenzhen Peoples R China

ISBN: (纸本)9781467363808;9781467363792

Although BTCM can significantly improves the BER performance by iteration processing between the demapping and the decoding in a traditional receiver, its design and performance in PNC system has fewer studied. This paper investigates a bit interleaved coded modulation (BICM) scheme in a Gaussian two-way relay channel operated with physical layer network coding (PNC). In particular, we first present an iterative demapping and decoding framework specially designed for PNC. After that, we compare different constellation mapping schemes in this framework, with the convergence analysis by using the EXIT chart. It is found that the anti-Gray mapping outperforms the Gray mapping, which is the best mapping in the traditional decoding schemes. Finally, the numerical simulation shows the better performance of our framework and verifies the mapping design.

关键词： physical layer network coding iterative demapping and decoding BICM repeat accumulate code

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physical-layer network coding IN OPTICAL networkS

PHYSICAL-LAYER NETWORK CODING IN OPTICAL NETWORKS

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12th International Conference on Optical Communications and networks (ICOCN)

作者： Chan, Calvin C. K. Liu, Zhixin Chinese Univ Hong Kong Dept Informat Engn Shatin Hong Kong Peoples R China

ISBN: (纸本)9781479913862

physical-layer network coding (PNC) is a promising technique to improve the network throughput of full-duplex transmission in a wireless two-way relay channel. Here, we explore the application of PNC in optical systems and networks. Two transmitted optical signal frames are simply added together to form an optical PNC-coded composite frame, which shares the same network channel/resource. At their destined node, the composite signal is directly-detected, before being decoded by subtracting one of the two transmitted signal frames, which is either already known or stored locally, from the received PNC-coded composite frame.

关键词： physical layer network coding optical networks

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Synchronization Analysis of physical-layer network coding in LTE System 25

Synchronization Analysis of Physical-layer Network Coding in...

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25th IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communication (PIMRC)

作者： Wang, Xiaoli Zhao, Qun DOCOMO Beijing Commun Labs Beijing Peoples R China

ISBN: (纸本)9781479949120

physical layer network coding (PNC) has recently attracted attention in wireless relay system. With PNC, the destructive effect of interference in wireless networks can be eliminated and the capacity of networks can be boosted significantly. However, synchronization is always considered as an outstanding issue which causes performance penalty on PNC. In [7], the impact of imperfect synchronization is investigated, however the analysis only considers the time domain signal processing, and it does not target at any specific practical system. In this paper, we investigate the synchronization issues on PNC in the most flourishing wireless network, long term evolution (LTE) system, considering the orthogonal frequency division modulation (OFDM) characteristics, the channel model, the transmission scheme and the adopted synchronization mechanism in LTE.

关键词： physical layer network coding Relay Synchronization

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Differential Modulation for Two-Way Wireless Communications: A Perspective of Differential network coding at the physical layer

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IEEE TRANSACTIONS ON COMMUNICATIONS 2009年第10期57卷 2977-2987页

作者： Cui, Tao Gao, Feifei Tellambura, Chintha CALTECH Dept Elect Engn Pasadena CA 91125 USA Univ Alberta Dept Elect & Comp Engn Edmonton AB T6G 2C5 Canada Jacobs Univ Sch Sci & Engn Bremen Germany

This work considers two-way relay channels (TWRC), where two terminals transmit simultaneously to each other with the help of a relay node. For single antenna systems, we propose several new transmission schemes for both amplify-and-forward (AF) protocol and decode-and-forward (DF) protocol where the channel state information. is not required. These new schemes are the counterpart of the traditional non-coherent detection or differential detection in point-to-point communications. Differential modulation design for TWRC is challenging because the received signal is a mixture of the signals from both source terminals. We derive maximum likelihood (ML) detectors for both AF and DF protocols, where the latter can be considered as performing differential network coding at the physical layer. As the exact ML detector is prohibitively complex, we propose several suboptimal alternatives including decision feedback detectors and prediction-based detectors. All these strategies work well as evidenced by the simulation results. The proposed protocols are especially useful when the required average data rate is high. In addition, we extend the protocols to the multiple-antenna case and provide the design criterion of the differential unitary space time modulation (DUSTM) for TWRC.

关键词： Differential modulation physical layer network coding two-way relay networks

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Achievable degrees of freedom of MIMO two-way X relay channel with delayed CSIT

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Science China(Information Sciences) 2016年第8期59卷 193-203页

作者： Qingyun LI Gang WU Hongxiang LI Shaoqian LI National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of China Department of Electrical and Computer Engineering University of Louisville

The previous work on interference alignment for multiple-input-multiple-output(MIMO) two-way X relay channel assumes perfect channel state information at the transmitter(CSIT), which is reasonable in slow fading channel. However, in fast fading scenario, this assumption is impractical. In this paper, assuming that each node has delayed CSIT, we study the achievable degrees of freedom(DOF) for MIMO two-way X relay channel in frequency division duplex(FDD) systems. Specifically, in the broadcast(BC) phase, we propose a new multiple-stage transmission(MST) scheme, which utilizes retrospective interference alignment for physical layer network coding(PLNC). We show that MST can achieve significant DOF gain and tremendous power gain over other schemes. When the number of antennas for each user, N, is smaller than the number of the relays, M, the time division multiple access(TDMA) scheme can only achieve an ergodic sum-rate increase by N bps/Hz for every increasing of 3 d B of signal-to-noise power ratio(SNR), while the proposed MST scheme can achieve an ergodic sum-rate increase by M bps/Hz.

关键词： degrees of freedom physical layer network coding interference alignment delayed CSIT multiplestage transmission

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Multiple-source multiple-destinations relay channels with network coding

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IET COMMUNICATIONS 2013年第17期7卷 1958-1968页

作者： Luo, Chunbo McClean, Sally Parr, Gerard Ren, Peng Gong, Yu Univ West Scotland Sch Comp Paisley Renfrew Scotland Univ Ulster Sch Comp & Informat Engn Coleraine BT52 1SA Londonderry North Ireland China Univ Petr Huadong Coll Control & Informat Engn Qingdao Peoples R China Univ Loughborough Sch Elect Elect & Syst Engn Loughborough Leics England

The essential broadcasting feature of radio propagation channels provides an opportunity for multiple nodes to exchange information and work cooperatively, where each node, for example, mobile sensor or robot, plays both the role of transmitter and receiver. Especially in such machine-to-machine communication scenarios, the network performance and redundancy of information from different providers highly affect the work efficiency of each individual node and the whole system. To address these problems, a relay assisted centralised network model with physical layer network coding implemented in the relay is proposed in this study. This structure has the advantage of flexible data exchange and the capability to reduce redundancy in information. Its theoretical performance is analysed by the diversity multiplexing tradeoff, which proves the proposed model is versatile in reliable and high spectral-efficiency information exchange. Experiments of multiple nodes in a machine-to-machine scenario - unmanned aerial vehicles, further reveal its potential in improving efficiency of communication and cooperation.

关键词： broadcasting multiplexing redundancy telecommunication channels network coding autonomous aerial vehicles relay networks (telecommunication) multiple-source multiple-destinations relay channels radio propagation channels information exchange machine-to-machine communication scenarios network performance information redundancy relay assisted centralised network model physical layer network coding flexible data exchange diversity multiplexing tradeoff spectral-efflciency information exchange machine-to-machine scenario unmanned aerial vehicles

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Error Performance Analysis of a Clustered Multiway Relay network

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2016年第11期65卷 8952-8963页

作者： Islam, Shama Naz Australian Natl Univ Res Sch Engn Coll Engn & Comp Sci Canberra ACT 2601 Australia Higher Educ Acad York YO10 5BR N Yorkshire England

In this paper, we propose a new clustered structure for a multiway relay network (MWRN) with G clusters, N users per cluster, one intracluster relay per cluster, and a single intercluster relay. The proposed structure allows private information exchange among users within a certain cluster through the corresponding intracluster relay and only public information exchange among users in different clusters through the intercluster relay. In this paper, we quantify the dominating error events in the proposed clustered MWRN and derive the expressions for the probability of these error events. Then, we use these expressions to derive the average bit error rate ( BER) of a clustered MWRN. It is shown that clustering in an MWRN improves the error performance by reducing the number of dominating error events and, in effect, reducing error propagation, compared with the nonclustered counterpart. The analysis proves that the average BER of a clustered MWRN is minimized when the number of clusters and the number of users per cluster are chosen to be the closest possible factors of the total number of users, i.e., L = GN. Finally, numerical simulation results are provided to verify the validity of the analysis.

关键词： Clustered multiway relay network (MWRN) cooperative communications error performance functional decode and forward (FDF) physical layer network coding

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network-coded diversity protocol for collision recovery in slotted ALOHA networks

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INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS AND networkING 2014年第3期32卷 225-241页

作者： Cocco, G. Alagha, N. Ibars, C. Cioni, S. CTTC Castelldefels 08860 Spain European Space Agcy Estec NL-2200 AG Noordwijk Netherlands

We propose a collision recovery scheme for symbol-synchronous slotted ALOHA based on physical layer network coding over extended Galois fields. Information is extracted from colliding bursts allowing to achieve higher maximum throughput with respect to previously proposed collision recovery schemes. An energy efficiency analysis is also performed, and it is shown that by adjusting the transmission probability, high energy efficiency can be achieved. A performance evaluation is carried out using the proposed algorithms, revealing remarkable performance in terms of normalized throughput. Copyright (C) 2013 John Wiley & Sons, Ltd.

关键词： multiple access MAC physical layer network coding PNC slotted ALOHA collision resolution

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