一种应用自适应技术进行快速同步的新方法

A NEW RAPID SYNCHRONZATION METHOD USING ADAPTIVE TECHNIQUE

提出了一种短波突变通讯中快速多普勒频偏估值和帧同步的新方法．该方法采用正交变μ的自适应方法，测频时采用修正ＡＭＥＳＥ估值，帧同步不采用一般帧码的办法，而是采用一种特殊的信号形式，直接利用自适应过程中误差信号的平方ε￣２（ｎ）的跳变来进行同步，从而获得更短的同步时间，该方法不仅能同步迅速、准确，且结构算法简便，利于工程实现，计算机模拟结果证实了该方法的优越性。

This paper presents a new method for rapid Doppler frequency shift estimation andframe synchronization in HF burst-communication.The method designed a special signal form assynchronizing head signal.At receiving terminal,the received base-band signal is taken as the input ofan adaptive line predictive filter.During the adaptive process,the authors use not only AMESE(Adaptive Maximum Entropy Spectrum Estimator)to estimate Doppler frequency, but also the errorsquare ε￣2(n)′s burst change to establish frame synchronization. Therefore,only a short period of time isneeded to establish synchronization.In order to achieve faster convergence speed and lowermisadjustment noise in the steady state,VS-NLMS(Variable Step Size Adaptive Filtering Algorithm)isused.The algorithm and structure of the scheme are very simple,and suited for DSP implementation inpratical applications.This method is proved very effective by computer simulation.