频域扩频码片级差分检测的误码率性能分析
Analysis of the BER Performance of Chip-Level Differential Detection for Frequency Domain Spread Spectrum System
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摘要: 该文提出了一种频域扩频系统中的差分检测方法:频域扩频码片级差分检测.通过利用判决变量的矩生成函数,并采用鞍点近似的分析方法,得到了频域扩频码片级差分检测的误码率性能的解析表达式,同时进行了仿真验证.分析和仿真结果表明,频域扩频码片级差分检测具有抵抗频率选择性衰落的能力,在信道的相干带宽不小于两个码片对应的频带宽度的前提下,随着信道多径时延扩展的增加,其误码率性能有进一步的提高.Abstract: A novel differential detection method, called Frequency Domain Spread Spectrum Chip-Level Differential Detection （FD-SS-CLDD） is proposed in frequency domain spread spectrum system. The Moment Generating Function （MGF） of decision variable and a saddle point approximation method are exploited to analyze the BER performance of FD-SS-CLDD, and the theoretical results are evaluated by simulation. If the coherent bandwidth of channel does not exceed the occupied bandwidth of two chips, with the increase of delay spread of the channel, FD-SS-CLDD exhibits a better performance to make the system resistant to frequency-selective fading.
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