广义分布式天线系统上行分集性能分析

Uplink performance of generalized distributed antenna systems with receive diversity

针对广泛存在于无线通信环境中的阴影效应对系统性能影响非常大的问题,采用与传统的微分集技术相比,能够有效地对抗这种阴影衰落的分布式天线技术来解决这个问题.为了获得该条件下系统的理论性能,分析了采用最大比合并和相干等增益合并分集的广义分布式天线系统.借助lognorm al近似法,给出了其中断概率和误码率性能的高精度解析结果.分析表明,在存在阴影衰落的情况下,这种广义分布式天线系统能够同时获得较大的微/宏分集增益,非常适合未来的无线小区环境.

Obstacles restricting wave propagation cause shadow fading, a common problem in wireless communication that severely degrades system performance. Compared with conventional microdiversity schemes, the generalized distributed antenna system （GDAS） can work against such fading more effectively. To explore its theoretical performance, analysis of an uplink GDAS using maximal ratio combining （MRC） and equal gain combining （EGC） diversity was done, and analytical expressions of the outage probability （OP） and bit error ratio （BER） were derived. A lognormal approximation method was used and the results turned out to be quite precise. This showed that GDAS effectively produces both macro and miero diversity gains, and thus is a very promising technology for future wireless communication.