TDMA扩谱通信系统中精同步的实现与性能分析

扩谱通信中一个最基本的任务就是实现本机的伪随机信号与接收的伪随机信号的同步。本文讨论了一种新的精同步方法,这种方法不同于目前常用的延迟锁定环和τ-抖动环,它采用了声表面波(SAW)卷积器作为接收机的可编程匹配滤波器,利用相关峰位置偏移而得到了本机时钟脉冲的相位调整,从而解决了一类时分多址(TDMA)传输突发信息符号的扩谱通信系统的精同步问题。文中概述了两种精同步的方法,分析和计算了它们的同步性能,并给出了一种同步方法的实验结果和数据。

Implementation and Performance Analysis for Fine Synchronization in TDMA Spread Spectrum Communication Systems

In spread-spectrum communication systems,the essential task which has to be performed is the synchronization of receiver pseudonoise (PN) signal with the pseudonoise signal contained in the input.This paper gives an account o,f a novel 'tracking or fine synchronization method in which is employed a surface acoustic wave convolver as a programmable matched filter in the receiver.This method is different from classical delay-looked loop and tau-dither loop which are used widely at present.The phase of receiver clock impulses is set by using deviation of the correlation peak positions,so that the fine synchronization for transmitting burst-format message can be realized in time-devision-multiple-address spread spectrum communication systems.Two fine synchronization methods are suggested.Theoretical analysis and fomulas for estimating the: performance of a system are given.A hardware implementation of one suggested method and experimental results obtained with the system are presented.