快衰落瑞利信道下分布式线性卷积空时码的分集增益
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摘要
在无线中继网络中,中继节点间的随机传输延迟将导致显著的性能下降。因此,针对慢衰落瑞利信道提出可容忍随机时延的分布式线性卷积空时码(DLC-STC),但该类空时码在快衰落信道下的分集性能尚未明确。该文从理论上证明了DLC-STC在快衰落瑞利信道下的分集增益。分析表明,DLC-STC虽然最初是在慢衰落信道下被提出的,但它在快衰落瑞利信道下通过利用最大似然(ML)接收机,仍可获得满异步协作分集增益,仿真结果验证了该理论分析,仿真结果同时表明:在快衰落瑞利信道下,DLC-STC采用MMSE-DFE接收机能够获得与ML接收机相同的分集增益。
In wireless relay networks, random transmission delays among relay nodes will lead to substantial performance degradation, for which delay-tolerant Distributed Linear Convolutive Space-Time Code(DLC-STC) is proposed. However, its diversity gain on fast fading Rayleigh channels is not clear. This paper analyzesthe diversity gain of the DLC-STC on fast fading Rayleigh channels. It is shown that the DLC-STC can achievefull asynchronous cooperative diversity order with Maximum Likelihood(ML) receivers on fast fading Rayleighchannels, although it is originally proposed for slow fading channels. The numerical results verify the theoreticalanalysis and show that MMSE-DFE receivers, can collect the same diversity order as ML receivers on fast fading Rayleigh channels.
In wireless relay networks, random transmission delays among relay nodes will lead to substantial performance degradation, for which delay-tolerant Distributed Linear Convolutive Space-Time Code(DLC-STC) is proposed. However, its diversity gain on fast fading Rayleigh channels is not clear. This paper analyzesthe diversity gain of the DLC-STC on fast fading Rayleigh channels. It is shown that the DLC-STC can achievefull asynchronous cooperative diversity order with Maximum Likelihood(ML) receivers on fast fading Rayleighchannels, although it is originally proposed for slow fading channels. The numerical results verify the theoreticalanalysis and show that MMSE-DFE receivers, can collect the same diversity order as ML receivers on fast fading Rayleigh channels.
引文
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[2]LI Qunwei and VARSHNEY P K.Resource allocation and outage analysis for an adaptive cognitive two-way relay ne tw or k[J].IEEE Tran sact ions on Wir eless Communications,2017,16(7):4727-4737.doi:10.1109/TWC.2017.2702170.
[3]ZHONG Fuli,XIA Xianggen,LI Hui,et al.Distributed linear convolutional space-time coding for two-hop fullduplex relay 2×2×2 cooperative communication networks[J].IEEE Transactions on Wireless Communications,2018,17(5):257-286.doi:10.1109/TWC.2018.2797914.
[4]LIU Yi,XIA Xianggen,ZHANG Zhiqiang,et al.Distributed space-time coding based on the self-coding of RLI for fullduplex two-way relay cooperative networks[J].IEEETransactions on Signal Processing,2017,65(12):3036-3047.doi:10.1109/TSP.2017.2675861.
[5]PENG Tong,and DE LAMARE R C.Adaptive buffer-aided distributed space-time coding for cooperative wireless networks[J].IEEE Transactions on Communications,2016,64(5):1888-1900.doi:10.1109/TCOMM.2016.2544934.
[6]NWANEKEZIE N,OWOJAIYE G,and SUN Yichuang.Implementing differential distributed orthogonal space time block coding using coefficient vectors[C].2016 IEEEWireless Communications and Networking Conference,Chennai,India,2016:1-6.doi:10.1109/WCNC.2016.7565133.
[7]GONG Fengkui,LI Guo,GE Jianhua,et al.Distributed concatenated recursive alamouti-circulant STBC for twoway multi-relay networks[J].IEEE Transactions on Communications,2016,64(8):3262-3274.doi:10.1109/TCOMM.2016.2589269.
[8]LI Yabo and XIA Xianggen.A family of distributed spacetime Trellis codes with asynchronous cooperative diversity[J].IEEE Transactions on Communications,2007,55(4):790-800.doi:10.1109/TCOMM.2007.894117.
[9]SHANG Yue and XIA Xianggen.Shift-full-rank matrices and applications in space-time trellis codes for relay networks with asynchronous cooperative diversity[J].IEEETransactions on Information Theory,2006,52(7):3153-3167.doi:10.1109/TIT.2006.876222.
[10]SHANG Yue and XIA Xianggen.Limited-shift-full-rank matrices with applications in asynchronous cooperative communications[J].IEEE Transactions on Information Theory,2007,53(11):4119-4126.doi:10.1109/TIT.2007.907510.
[11]WANG Huiming,XIA Xianggen,YIN Qinye,et al.A family of space-time block codes achieving full diversity with linear receivers[J].IEEE Transactions on Communications,2009,57(12):3607-3617.doi:10.1109/TCOMM.2009.12.080477.
[12]SHANG Yue and XIA Xianggen.Space-time block codes achieving full diversity with linear receivers[J].IEEETransactions on Information Theory,2008,54(10):4528-4547.doi:10.1109/TIT.2008.928986.
[13]GUO Xiaoyong and XIA Xianggen.A distributed spacetime coding in asynchronous wireless relay networks[J].IEEE Transactions on Wireless Communications,2008,7(5):1812-1816.doi:10.1109/TWC.2008.070042.
[14]GUO Xiaoyong and XIA Xianggen.Distributed linear convolutive space-time codes for asynchronous cooperative communication networks[J].IEEE Transactions on Wireless Communications,2008,7(5):1857-1861.doi:10.1109/TWC.2008.070753.
[15]LIU Yi,XIA Xianggen,and ZHANG Hailin.Distributed space-time coding for full-duplex asynchronous cooperative communications[J].IEEE Transactions on Wireless Communications,2012,11(7):2680-2688.doi:10.1109/TWC.2012.060212.112214.
[16]LIU Yi,XIA Xianggen,and ZHANG Hailin.Distributed linear convolutional space-time coding for two-relay fullduplex asynchronous cooperative networks[J].IEEETransactions on Wireless Communications,2013,12(12):6406-6417.doi:10.1109/TWC.2013.102313.130541.
[17]HAMMONS A R and EI GAMAL H.On the theory of space-time codes for PSK modulation[J].IEEE Transactions on Information Theory,2000,46(2):524-542.doi:10.1109/18.825816.
[18]TAROKH V,SESHADRI N,and CALDERBANK A R.Space-time codes for high data rate wireless communication:Performance criterion and code construction[J].IEEE Transactions on Information Theory,1998,44(2):744-765.doi:10.1109/18.661517.
[19]WANG Huiming,XIA Xianggen,and YIN Qinye.Computationally efficient equalization for asynchronous cooperative communications with multiple frequency offsets[J].IEEE Transactions on Wireless Communications,2009,8(2):648-655.doi:10.1109/TWC.2009.071389.