【摘要】 在简要论述按传统的基于标准高斯近似(SGA)假设得到的DSSS系统抗单音连续波(CW)干扰性能分析结果的基础上,推导出CW干扰经周期序列DSSS系统相关解扩处理产生的符号判决变量中干扰分量的数学表达式,对周期序列DSSS系统抗CW干扰的实际性能进行了理论分析与仿真。结果表明,周期序列DSSS系统在CW干扰下符号判决变量中的干扰分量呈现固定电平或单频波动,并不近似于标准高斯分布,周期序列DSSS系统抗CW干扰的实际性能与基于SGA假设的分析结果完全不同,其误码性能不仅与干信比、干扰频偏和相位密切相关,还与具体的扩频序列有关。更多还原

【Abstract】 Based on the brief account of the performance analysis result of direct sequence spread spectrum(DSSS) system against single tone continuous wave(CW) interference obtained from the traditional stand Gaussian approximation(SGA) hypothesis,the mathematical expression of the interference component of the symbol decision variable in the periodic sequence DSSS system under CW interference was deduced and the actual performance of DSSS system with a periodic sequence against CW interference was researched by theoretical analysis and numerical simulations.The results indicate that the interference component of the symbol decision variable in the periodic sequence DSSS system under CW interference takes on a constant level or a monochromatic fluctuation,which does not approach the standard Gaussian distribution,and the actual performance of DSSS system with a periodic sequence against CW interference is completely different from the analytic result resorted to the stand Gaussian approximation(SGA).The bit error performance is correlative not only with the interference-signal ratio(ISR),with the frequency offset and with phase of the CW interference sensitively,but also with the individual spread spectrum code sequence.更多还原