中文摘要：

目前对多音干扰的分析主要是针对跳频通信系统开展的，并且通常假设干扰是不变的。该文对TD-SCDMA系统在时变多音干扰下的误码率性能进行了分析。考虑实际系统中干扰源的移动性，将干扰信道建模为时变瑞利衰落信道。分析了多普勒频移对系统性能的影响，推导了误码率公式，并通过计算机仿真验证了理论推导的正确性。理论分析和仿真结果表明，多普勒频移越大，系统干扰效果越差，该结果对干扰和抗干扰技术提供了理论基础。

英文摘要：

The existing analyses of multi-tone jamming （MTJ） are mainly focused on the frequency hopping system, and assume that the jamming signal is time-invariant. In this paper, the bit error rate （BER） performance of the time division-synchronization code division multiple access （TD-SCDMA） system is analyzed in the presence of time-varying multi-tone jamming. The practical scenario where MTJ signal experiences time-varying Rayleigh fading channel is considered. The effect of the Doppler shift on the performance is studied. The BER expression is derived and validated by computer simulations. The simulation results show that the performance degrades as the Doppler shift increases. The study provides theoretical basis for jamming and anti-jamming technology.