不同干扰对QAM解调性能的影响分析  

Effects of Different Jams on QAM Demodulation Performance

作　　者：秦伟[1] 王可人[1] 金虎[1] 钱锋[1] 

机构地区：[1]电子工程学院,安徽合肥230037

出　　处：《通信技术》2016年第9期1109-1114,共6页Communications Technology

基　　金：国家自然科学基金项目(No.61171170)~~

摘　　要：不同干扰下,正交幅度调制(Quadrature Amplitude Modulation,QAM)的解调性能受到的影响不同。通过建立QAM在干扰下的系统模型,推导出一定条件下使得QAM解调性能最差的干扰信号的统计分布。通过分析可知,此时的统计分布符合QPSK调制方式信号的特征,并对此进行了仿真验证。实验仿真结果表明,在干信比给定范围内,QAM在选择QPSK调制方式的干扰信号下解调性能最差,这与理论方法计算所得到的结果相一致。The effects of different jams on the demodulated performance of QAM（Quadrature Amplitude Modulation） are quite different. The demodulated performance of QAM under the digital modulated jamming is analyzed, and the statistical distribution of jamming signal that makes demodulated performance the worst also derived. The analysis reveals that the statistical distribution accords with the characteristics of QPSK modulated signal. Simulation indicates that the experiment result is quite in accord with the calculated result by theoretical inferences.

关 键 词：正交幅度调制 干扰 调制 解调 

分 类 号：TN91[电子电信—通信与信息系统]