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Performance of Physical-layer Network Coding in Asymmetric Rayleigh Fading Two-way Relay Communication Systems

机译：非对称瑞利衰落双向中继通信系统中物理层网络编码的性能

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摘要

Physical-layer Network Coding (PNC) has drawn so much attention of wireless communication researchers. However, most of the studies focused on symmetric Two-Way Relay Communication (TWRC) systems. In order to analyze the performance of PNC in asymmetric scenario, in this study, we classify TWRC systems with Rayleigh fading channels into five asymmetric cases according to different poor channel allocation. In each symmetric and asymmetric case, we provide the detailed signal transmission and processing progress. Then we simulate the Bit Error Rate (BER) performance of PNC either in symmetric or asymmetric cases. From the results, we know that the Phase Asymmetry-Uplink (PA-U) case is the worst and Downlink Channel Asymmetry (DCA) case is the best among the five asymmetric cases. We also conclude that poor uplink channels will provide more severe effect to the performance degradation caused by system asymmetry than poor downlink ones.
机译：物理层网络编码（PNC）引起了无线通信研究人员的极大关注。但是，大多数研究集中在对称双向中继通信（TWRC）系统上。为了分析PNC在非对称情况下的性能，在本研究中，我们根据不同的不良信道分配将具有瑞利衰落信道的TWRC系统分为五个非对称情况。在每种对称和非对称情况下，我们都会提供详细的信号传输和处理进度。然后，我们在对称或不对称情况下模拟PNC的误码率（BER）性能。从结果可以看出，在这五个不对称情况中，相位不对称-上行链路（PA-U）情况最差，而下行链路信道不对称（DCA）情况最好。我们还得出结论，较差的上行链路信道比较差的下行链路信道对系统不对称引起的性能下降的影响更大。

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