SIMO系统分集合并技术的性能分析

由于无线传输环境的复杂性,使得接收端必须采用抗信道衰落的技术,分集技术就是抗信道衰落的最有效措施之一。本文介绍了SIMO系统3种常见分集合并方式的基本原理及合并准则,分析了分集接收天线数与系统性能及系统复杂度之间的关系,并在瑞利衰落信道中采用16-QAM调制的情况下,对3种分集技术的误码率性能进行了仿真。结果表明MRC性能最好,EGC性能稍差,SC性能较差。但3种合并技术的算法复杂度正好相反,在实际应用中可根据需要进行折衷。

Performance Analysis of Diversity Combining Technique in SIMO System

For the complexity of the wireless transmission environment,the technique to combat the channel fading must be used in the receiver and diversity,is one of the most effective techniques on combating channel fading.The fundamental principle and the combining rule of the three common linear combining diversity approaches which are used in the SIMO system are introduced.The relationship among the system performance,system complexity and the number of diversity receive antenna are analyzed.In flat Rayleigh fading channel,the biterror-rate performance of three diversity combining techniques for 16-QAM modulation are simulated.The Monte-Carlo simulation results verify that MRC performance is optimal,EGC is sub-optimal,and SC is the worst,however the complexity of the three techniques is reversed.Some balances are needed in the practical applications.