基于锁相环和小波变换的PSK信号波特率估计

Symbol rate estimation of PSK signal based on PLL and wavelet transform

提出一种改进的基于小波变换的波特率估计方法,使用基于锁相环技术的自适应相位跟踪方法实现相位同步并提取信号包络,通过获得基带信号的小波变换的幅值来估计信号的波特率。这种改进方法能够有效地解决经典的Chan氏算法中存在的估计效果受初相和噪声影响的问题。仿真结果表明,这种新方法有效并且与已有算法相比体现了其先进性。

An improved algorithm for symbol rate estimation based on wavelet transform was proposed. The PLL based phase adaptive tracking approach was applied to synchronize the phase between the receiver and the transmitter and extract the signal envelope. The symbol rate was estimated from the wavelet transform magnitudes of the base-band sig- nal. The improved algorithm effectively solved the problem on the result of estimation suffering from initial phases and noise occurred in the classical Chan＇s algorithm. Simulation results verify that the novel algorithm is efficient and supe- rior to the existing algorithms.