基于译码的DS/FH/TH扩频系统同步捕获方法研究

Synchronization Acquisition Method Based on Decoding Method in DS/FH/TH Spread Spectrum System

传统的DS/FH混合扩频系统中,移动终端的发射信号会对自身接收通道造成大功率干扰,以至于无法正常接收信号,通过引入跳时技术,建立DS/FH/TH混合扩频系统可有效解决此问题。在混合扩频系统同步过程中,采用了基于译码的同步捕获方法,对虚警概率、检测概率、平均捕获时间等同步性能指标进行理论分析,并使用计算机仿真验证模型的有效性。与传统基于相关的捕获方法相比,基于译码的方法具有更加优良的抗干扰能力和同步性能。

In the traditional DS/FH spread spectrum system,the high power interfeence problem caused by transmitted signal makes the normal reception impossible.This problem is effectively solved by introducing time hopping to build DS/FH/TH spread spectrum system.At the same time,synchronization acquisition method is adopted based on decoding method.Theoretical analysis of synchronization perfrmance,such as false alarm probability,detection probability,mean acquisition time,etc.is made,and computer simulation is introduced to prove the system＇ s effectivity.Compared with traditional corelation method,the decoding method has better performance in anti-interference and synchronization.