多径衰落信道中导引符号辅助的二维扩频相干解调的性能分析

Performance Analysis of Pilot Symbol Assisted Two Dimensional Spread Spectrum Systems in Multi-Path Fading Channels

在多径衰落信道中,本文分析了导引辅助的二维扩频相干解调的误码率性能.提出了信道的时频二维相关区域的概念,给出了信道时频二维信道相关特性的计算方法.结果表明,分析与仿真的误码率相近;当二维扩频的扩频增益对应的时频二维区域大于信道的时频二维相关区域时,再增大扩频增益会导致误码率性能变差.

We analyze the bit error rate (BER) performance of pilot symbol assisted two-dimensional spread spectrum systems with coherent demodulation in multi-path fading channels. In order to evaluate the influence of processing gain on BER performance, the concept and computing method of channel correlative area have been proposed. Finally, compared with the computer simulation results, it shows that the analyzed results agree well with the simulation results. It also supports the correctness of the theoretical BER analysis. And we find that the processing gain cannot be increased when the two-dimensional area corresponding to processing gain is larger than the correlative area in multi-path fading channels, or the performance of BER will come bad.