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以直扩码分多址 (DS- CDMA)系统并行干扰消除检测器为模型 ,分析其在定时同步错误情况下的性能。由于在实际系统中定时跟踪的不准确 ,总是存在定时同步错误 ,干扰消除算法对定时错误的稳健性是值得研究的。Buehrer分析了软判决 PIC在定时跟踪错误下的性能 [5 ] ,给出了封闭形式的误码率表达式。本文则分析了硬判决 PIC残余多址干扰的结构及统计特性 ,导出了定时跟踪错误下封闭形式的误码率表达式。通过仿真与数值计算 ,分析了定时跟踪错误对硬判决并行干扰消除算法的影响。
The parallel interference cancellation detector of DS-CDMA system is taken as a model to analyze its performance under the condition of timing synchronization error. Due to inaccurate timing tracking in real systems, there always exists timing synchronization error, and the robustness of the interference cancellation algorithm to timing errors is worth studying. Buehrer analyzes the performance of soft decision PIC under the timing tracking error [5], and gives the closed-form error rate expression. In this paper, we analyze the structure and statistical properties of hard-decision PIC residual multiple access interference and derive the closed-form error rate expression under the timing tracking error. Through the simulation and numerical calculation, the influence of timing tracking error on hard decision parallel interference cancellation algorithm is analyzed.