准同步CDMA及其在卫星移动通信中的应用  

Research on Quasi synchronous CDMA and Its Application in Mobile Satellite Communication

作　　者：段少华[1] 张中兆[1] 张乃通[1] 

机构地区：[1]哈尔滨工业大学通信技术研究所,哈尔滨150001

出　　处：《高技术通讯》2001年第1期48-52,共5页Chinese High Technology Letters

基　　金：863计划资助项目!(86 3 2 8 2 )

摘　　要：研究了一种新颖的多址准同步CDMA方式。理论推导了准同步CDMA性能表达式。在性能评价的基础上 ,构造了两族新的扩频码集。分析表明 ,采用新码集时 ,准同步CDMA性能要远优于异步CDMA。An analysis of a novel multiple access technology, quasi synchronous CDMA (QS CDMA) is presented. An expression for average bit error rate (BER) as a function of code parameters is obtained. Then two kinds of new spread codes are constructed for QS CDMA. The results show the performance of QS CDMA using new spread codes is much better than the performance of asynchronous CDMA. Finally, QS CDMA used in the reverse channel of mobile satellite communication is discussed and the results are also acquired.

关 键 词：卫星移动通信 信道 准同步CDMA 移位M序列 移位正交M序列 

分 类 号：TN927[电子电信—通信与信息系统]