乘积转发型双向中继网络性能分析及功率控制研究
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摘要
在高斯信道下,乘积转发(Product-and-forward,PF)双向中继网络可以提供比放大转发(Amplify-and-forward,AF)双向中继网络更低的误符号率(Symbol-error rate,SER)。为了研究PF中继网络在瑞利衰落信道下的性能,推导出了PF中继网络的SER性能渐进表达式,且理论分析显示PF中继网络比AF中继网络拥有更好的SER性能。仿真结果和理论分析吻合,充分验证了该表达式的合理性与PF中继网络的优越性。为了进一步提高PF中继网络的SER性能,以发射总功率为约束条件,提出了最小化SER的功率控制算法。仿真结果表明所提算法可以显著提高系统SER性能。
Two-way product-and-forward(PF) relay networks can provide lower asymptotic symbol-error rate(SER) than amplify-and-forward(AF) relay networks. In order to study the performance of PF relay networks over Rayleigh fading channels,the asymptotic SER expression of the PF relay networks is derived and analytical results show that PF relay networks have better SER performance than AF relay networks. Experimental results agree well with the analytical results. In order to enhance the SER performance of PF relay networks,a power allocation algorithm to minimize SER under total transmit power constraint is proposed. Simulations show that proposed algorithm can significantly enhance the SER performance.
Two-way product-and-forward(PF) relay networks can provide lower asymptotic symbol-error rate(SER) than amplify-and-forward(AF) relay networks. In order to study the performance of PF relay networks over Rayleigh fading channels,the asymptotic SER expression of the PF relay networks is derived and analytical results show that PF relay networks have better SER performance than AF relay networks. Experimental results agree well with the analytical results. In order to enhance the SER performance of PF relay networks,a power allocation algorithm to minimize SER under total transmit power constraint is proposed. Simulations show that proposed algorithm can significantly enhance the SER performance.
引文
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[2]Rankov B,Wittneben A.Spectral efficient signaling for half-duplex relay channels[C]//Asilomar Conference on Circuits,Systems and Computers.Illinois,Monticello:IEEE Computer Society Press,2005:1066-1071.
[3]陈文,韦莎.无线协作网络的物理层网络编码研究进展[J].数据采集与处理,2016,31(3):415-428.Chen Wen,Wei Sha.Research progress on physical layer network coding for wireless cooperative networks[J].Journal of Data Acquisition and Processing,2016,31(3):415-428.
[4]Li Q,Ting S H,Pandharipande A.Adaptive two-way relaying and outage analysis[J].IEEE Transactions on Wireless Communications,2009,8(6):3288-3299.
[5]梁文文,田华,徐友云,等.非对称双向多中继系统机会式网络编码中断概率分析[J].数据采集与处理,2013,28(1):28-33.Liang Wenwen,Tian Hua,Xu Youyun,et al.Outage probability analysis of opportunistic network coding for asymmetric bidirectional multi relay system[J].Journal of Data Acquisition and Processing,2013,28(1):28-33.
[6]唐伦,刘通,陈前斌,等.Two-way中继系统协作节点选择及功率分配策略[J].电子与信息学报,2010,32(9):2077-2082.Tang Lun,Liu Tong,Chen Qianbin,et al.Cooperative node selection and power allocation strategy for two-way relay system[J].Journal of Electronics and Information Technology,2010,32(9):2077-2082.
[7]Yuan Q,Zhou Y,Zhao M,et al.Optimal transmission power allocation for two-way relay channel using analog network coding[C]//International Conference on Consumer Electronics,Communications and Networks.Xianning,Hubei,China:IEEE Computer Society Press,2011:4243-4246.
[8]Yang Y.Power allocation for two-way opportunistic amplify-and-forward relaying over Nakagami-m channels[J].IEEE Transactions on Wireless Communications,2011,10(7):2063-2068.
[9]Wang C L,Cho T N,Yang K J.On power allocation and relay selection for a two-way amplify-and-forward relaying system[J].IEEE Transactions on Communications,2013,61(8):3146-3155.
[10]Xu S,Xu D,Zhang X,et al.Two-way relay networks based on product relay[J].Electronics Letters,2015,51(5):429-430.
[11]Su W,Sadek A K,Liu K J R.Cooperative communication protocols in wireless networks:Performance analysis and optimum power allocation[J].Wireless Personal Communication,2008,44:181-217.
[12]Yang J,Cao X H,Chen R.Minimum transmit power under/considering relay selection for asymmetric two-way relaying networks[J].IET Communications,2014,8(18):3254-3258.