相关信道下基于功率分配的MIMO系统容量分析
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摘要
采用信道矩阵的分解、奇异值扩展等方法,从天线上的功率分配与信道的相关性这两个角度分析多输入多输出(MIMO)系统信道的相关性和容量。通过仿真分析,发现不同的天线相关程度和功率分配算法的作用是不同的。注水算法能在一定程度上弥补信道相关性所带来的容量损失。而且,当信噪比增大到一定程度时,注水算法的效果越来越接近平均分配算法。
In this paper,the capacity of MIMO systems is discussed in terms of both power distribution and channel correlation. The channel correlation and capacity are analyzed by using matrix decomposition and singular value spread. It is found via simulation that,power distribution plays different role according to correlation or not,and the degree of correlation. And water-filling algorithm can offset the loss caused by channel correlation. Meanwhile,it is found that the effect of water-filling algorithm is close to average distribution algorithm as the signal to noise ratio( SNR) grows to an extent.
In this paper,the capacity of MIMO systems is discussed in terms of both power distribution and channel correlation. The channel correlation and capacity are analyzed by using matrix decomposition and singular value spread. It is found via simulation that,power distribution plays different role according to correlation or not,and the degree of correlation. And water-filling algorithm can offset the loss caused by channel correlation. Meanwhile,it is found that the effect of water-filling algorithm is close to average distribution algorithm as the signal to noise ratio( SNR) grows to an extent.
引文
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[8] CHIZHIK D,FARROKH R F,LING J,et al. Effect of antenna separation on the capacity of BLAST in correlated channels[J]. IEEE Communications Letters,2000,4(11):337-339.
[9]张雯,李宏,何为超.瑞利相关衰落下MIMO系统信道容量[J].弹箭与制导学报,2006,26(1):819-822.
[10] GAO X,EDFORS O,RUSEK F,et al. Massive MIMO performance evaluation based on measured propagation data[J]. IEEE Transactions on wireless communications,2015,14(7):2899-3911.
[2]蒋留兵,杨昌昱,李卓伟. OFDM和MIMO系统中的快速注水功率分配算法[J].电视技术,2014,38(15):178-180.
[3]孙继禹,谢红,刘卓夫.确定性MIMO信道在不同功率条件下的容量分析[J].哈尔滨理工大学学报,2010,15(6):94-98.
[4]肖雪芳,林烽,雷国伟.天线相关性对多天线系统信道容量的影响[J].厦门理工学院学报,2016,24(5):64-69.
[5]杨国荣.基于V—BLAST的MIMO无线通信系统性能分析[J].系统仿真技术,2014,10(1):81-84.
[6] TELETAR E. Capacity of multi-antenna Gaussian channels[J]. European Transactions on Telecommunications,1999,10(6):585-595.
[7]姜永权,刘乃安,沈民奋,等. MIMO系统一种新的功率分配算法及容量分析[J].电子学报,2007,35(9):1749-1753.
[8] CHIZHIK D,FARROKH R F,LING J,et al. Effect of antenna separation on the capacity of BLAST in correlated channels[J]. IEEE Communications Letters,2000,4(11):337-339.
[9]张雯,李宏,何为超.瑞利相关衰落下MIMO系统信道容量[J].弹箭与制导学报,2006,26(1):819-822.
[10] GAO X,EDFORS O,RUSEK F,et al. Massive MIMO performance evaluation based on measured propagation data[J]. IEEE Transactions on wireless communications,2015,14(7):2899-3911.