用于分布式天线的选择分集2D-RAKE接收机

2D-RAKE receiver with selection diversity in distributed antenna systems

针对分布式天线系统,提出了一种新的空时二维-RAKE(2D-RAKE)接收机方案,使用M个L-分支选择合并器(SC),每个SC的输出送入一个有LR个抽头的RAKE接收机。作者分析了在频率选择性Nakagami衰落信道中,该接收机的误比特率特性,讨论了不同衰落参数下不同L,M和LR组合对系统性能的影响。数值分析表明:与常规2D-RAKE接收机相比,该机不仅可以利用多个天线的空间分集合并改善系统的性能,而且明显降低了系统复杂度,因此可以在分布式天线系统中利用2D-RAKE接收机改善系统性能。

A new twodimensional RAKE (2DRAKE) receiver that uses M groups of Lbranch selection combiners (SC) and LR RAKE fingers for each SC was developed for distributed antenna systems. A closedform expression of the average bit error rate in a frequencyselective Nakagami fading channel was derived. The effect of different combinations of L, M and LR on the system performance was also evaluated for different fading parameters. A numerical simulation indicates that, compared with a conventional 2DRAKE receiver, this receiver provides significantly improved performance using space diversity reception with the same or reduced complexity. Therefore, 2DRAKE receiver technology can be used in distributed antenna systems.