頻域擴(kuò)頻碼片級(jí)差分檢測(cè)的誤碼率性能分析
Analysis of the BER Performance of Chip-Level Differential Detection for Frequency Domain Spread Spectrum System
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摘要: 該文提出了一種頻域擴(kuò)頻系統(tǒng)中的差分檢測(cè)方法:頻域擴(kuò)頻碼片級(jí)差分檢測(cè).通過利用判決變量的矩生成函數(shù),并采用鞍點(diǎn)近似的分析方法,得到了頻域擴(kuò)頻碼片級(jí)差分檢測(cè)的誤碼率性能的解析表達(dá)式,同時(shí)進(jìn)行了仿真驗(yàn)證.分析和仿真結(jié)果表明,頻域擴(kuò)頻碼片級(jí)差分檢測(cè)具有抵抗頻率選擇性衰落的能力,在信道的相干帶寬不小于兩個(gè)碼片對(duì)應(yīng)的頻帶寬度的前提下,隨著信道多徑時(shí)延擴(kuò)展的增加,其誤碼率性能有進(jìn)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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