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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。
Aiming at the distributed antenna system, a new space-time two-dimensional (2D-RAKE) receiver scheme is proposed using M L-branch select combiners (SCs) Taps RAKE receiver. The authors analyze the bit error rate characteristics of this receiver in frequency selective Nakagami fading channels and discuss the effect of different L, M and LR combinations on system performance under different fading parameters. Numerical analysis shows that, compared with the conventional 2D-RAKE receiver, it can not only utilize the space diversity combining of multiple antennas and improve the performance of the system, but also reduce the complexity of the system significantly. Therefore, the distributed antenna system can utilize 2D- RAKE receiver to improve system performance.