MQAM-WPM-FH多载波跳频通信系统误码率性能分析

摘要

In order to analyze the effect of M-ary quadrature amplitude modulation( MQAM) ,length of the wavelet filters and wavelet packet tree on the wavelet packet modulation frequency hopping communication system(WPM-FH),this paper derives the bit error rate(BER) equation of MQAM-WPM-FH system in additive white Gaussian noise( AWGN) channel by using the relationship between M-ary amplitude shift keying( MASK) and MQAM. And then it investigates the effect of the length of the wavelet filters and wavelet packet tree on the system. Theoretical analysis and simulation results show that the MQAM-WPM-FH system has better spectrum utilization and BER performance in comparison with MQAM-OFDM-FH system,and by increasing the number of modulation QAM constellation points M and the length L of the fil-ters used in WPM,significant multiple access interference( MAI) reduction can be achieved for a fixed sys-tem bandwidth;though different wavelet packet trees have only a small effect on the BER performance of the system,WPM-FH system has better security because of the diversity of WPM.%为了分析多进制正交幅度调制( MQAM)映射方式、小波滤波器长度和小波包树结构对小波包跳频通信系统( WPM-FH)的影响,首先利用多进制幅移键控( MASK)和MQAM之间的关系,推导了MQAM-WPM-FH系统在加性高斯白噪声( AWGN)信道中的误码率理论公式,分析了不同小波滤波器长度和小波包树结构对WPM-FH系统的影响。理论分析和仿真结果表明,与正交频分复用跳频( OFDM-FH)系统相比,MQAM-WPM-FH系统具有较高频带利用率和较好的性能；在给定带宽下,通过增大MQAM数据映射中的星座点数M和小波滤波器长度L,可以有效降低多址干扰( MAI)对系统的干扰；AWGN信道下,不同的小波包树结构对跳频系统的性能影响较小,但小波包调制结构的多样性可以提高系统的安全性。