小波多速率调制码元同步算法研究及性能分析

The Clock Acquisition Algorithm Design and Performance Analysis for Wavelet-based Multirate System

本文研究了基于正交小波的多速率系统码元同步信息的提取。分别利用小波函数的相关性及尺度函数的相关性构造了两种同步环算法,通过采用接收信号与本地小波函数和尺度函数相关的方法,利用小波变换的冗余性,提取信号的同步信息。在高斯信道下仿真表明,两种同步算法均可有效地提取信号的码元时钟,但基于尺度函数的同步环路稳定性更好,而基于小波函数的环路则收敛速度更快。

This paper studies the clock acquisition algorithm for timing recovery for wavelet-based muhirate system based on the characteristics of correlation of wavelet function and scaling function, we proposed two kinds of clock acquisition algorithm by using a new improved S-curve. These algorithms utilize redundancy of wavelet transform to locate the peak points of the correlative function and then estimate the symbols clocks. In AWGN channel,Simulation results show that the approach successfully acquires the correct timing point, but the algorithm based on wavelet function converged faster, and the algorithm based on scaling function behaved more stable.