高速分组无线网中M进制正交扩频方法的研究

Study on coding and modulation of the M-ary orthogonal spread spectrum system

基于M进制正交扩频通信的基本原理 ,给出了正交扩频编码的产生和选取原则 ,提出了适合于高速分组无线网的应用环境和能够实现快速同步捕获和高速信息传输的新方法 ,即传输信息的同时 ,增加同步捕获逻辑信道 .设计了用Walsh函数和m序列扩频编 /解码的QTPK调制解调实验系统 ,证实了方案的有效性 .

Based on the fundamental theory of the M-ary orthogonal spread spectrum system, a principle for the generation and selection of the orthogonal spread spectrum code is suggested. A new method that is suitable for the environment of high-speed packet radio networks and results in faster synchronization acquisition and higher bit rates is proposed, in which a synchronization logic channel is added while the information is transmitted. An experimental system with the Walsh function and m-ary series spread spectrum coding & decoding is developed for QTPK modulation & demodulation, and experimental results show that the method is effective.