移动自组织网络中可变速率自适应同步捕获

Variable-rate-supported adaptive synchronization in Ad-hoc network

基于多进制正交扩频通信的原理,提出一种同步信道辅助的多进制正交码扩频系统设计方案.通过传输两个逻辑信道,分别实现快速同步捕获和高速信息传输.即传输多进制正交码扩频的数据信息同时,传输一路同步和控制逻辑信道,来建立接收端的载波和码元同步.采用具有尖锐单峰特性自相关函数的巴克(Barker)码做同步码组,且利用巴克码的不同组合传递数据速率信息.依据匹配滤波器的算法原理,实现快速同步捕获.并据移动通信信道的特点,提出了自适应门限的思想,设计实现了适合于移动自组织网络指标要求的应用系统,证实了方案的有效性.

Based on the principle of the M-ary orthogonal spread spectrum, we propose a fast variable-ratesupported synchronization method by an assistant logic channel. Data and synchronization information are transmitted in data and assistant channel respectively. Different combinations of Barker codes make up the synchronization codes to represent different rates. By the principle of the matched filter and the characteristic of mobile channels, an adaptive threshold algorithm is also proposed for Ad-hoc networks.