不同干扰对QSPK解调性能的影响分析

Analysis on Different Jamming Effects on QPSK Demodulation Performance

随着数字卫星通信的快速发展,QPSK作为数字卫星通信系统中一种重要的调制方式,其解调性能也受到越来越多的关注。主要分析QPSK信号在已调干扰信号下的解调性能,并推导出使得QPSK调制信号解调性能最差的干扰信号的统计分布,而且此时统计分布符合QPSK调制方式干扰信号的特征。最后通过实验仿真分析得出信噪比未超过一定值时QPSK调制信号在QPSK调制干扰信号下解调性能最差,并与不同已调制干扰和AWGN干扰下的解调性能作比较。

With the rapid development of digital satellite communication,QPSK become an important modulation of digital satellite communication system,and its demodulated performance has been given more and more public concern.The demodulated performance of QPSK signal is mainly analyzed under the digital modulated jamming,and the statistical distribution of jamming signal make demodulated performance worst,and the statistical distribution also accords with the characteristics of QPSK modulated signal.Numerical results are presented in order to validate the theoretical inferences presented and compare it with various modulated jamming and AWGN jamming.