摘要
首先根据morlet小波函数的时频特征以及多进制频移键控（Mary frequency—shift keying，MFSK）信号的时频分布，提出了一种基于morlet小波变换的MFSK信号符号率估计算法，该算法通过对小波脊线过零点的检测实现；然后对2FSK、4FSK信号符号率估计性能进行了仿真，仿真结果表明：在信噪比为-5dB情况下，2FSK、4FSK信号仍可实现4％的符号率相对估计精度。
According to the time-frequency distributions of morlet wavelet and M-ary frequencyshift keying（MFSK） signal, a symbol rate estimation algorithm is proposed based on morlet wavelet transform, and it is accomplished by means of detecting zero-crossing of wavelet ridge. In the paper, some simulations are carried out the estimation precision is about for 2FSK and 4FSK signals, and simulation results demonstrate that 4G when SNR is --5 dB.
出处
《装备指挥技术学院学报》
2009年第3期57-60,共4页
Journal of the Academy of Equipment Command & Technology
基金
国家“九七三”重点基础研究基金项目(2007CB310600)
国家自然科学基金资助项目(60532070,60525107)
关键词
MFSK信号
符号率
小波变换
M-ary frequency-shift keying signal
symbol rate
Wavelet transform
