四相ZCZ序列在QS-CDMA系统中的应用  

Application of Quadriphase ZCZ Sequence in QS-CDMA System

作　　者：李树锋[1] 贾志成[1] 王婧[1] 葛玲[1] 

机构地区：[1]河北工业大学北辰校区信息工程学院,天津市300401

出　　处：《微计算机信息》2007年第36期96-97,58,共3页Control & Automation

基　　金：国家自然科学基金项目(项目编号:60502016)

摘　　要：随着QPSK调制技术的发展,四相扩频序列得到了广泛的研究。根据QPSK调制的四相准同步码分多址(QS-CDMA)系统,分析了四相零相关区(ZCZ)序列的性能准则。同时提出了一种扩展四相零相关区序列长度的方法;并在高斯白噪声(AWGN)信道条件下,对QPSK调制的基于四相零相关区序列的准同步CDMA系统进行了仿真。结果表明,采用此序列时,系统性能在抗干扰方面与同步系统非常接近,远优于异步系统,且采用扩展后的序列比原序列能得到较好的系统性能。Quadriphase spreading sequences have attracted a great deal of attention with the development of the QPSK technology, The system performance is analyzed based on the QPSK QS-CDMA system with the quadriphase ZCZ sequence. We present a method for extending the length of the ZCZ sequence, the simulations of the QPSK QS-CDMA system with ZCZ sequences as spreading codes on additive white Gaussian noise （AWGN） channel show that the quadriphase ZCZ＇ ability to restrain multiple access interference is close to the S-CDMA system, and is much better than that of A-CDMA system, meanwhile the system performance of QS-CDMA using the extended sequence is better than that of using the original sequence.

关 键 词：四相扩频序列 零相关区序列 准同步CDMA 

分 类 号：TP302.1[自动化与计算机技术—计算机系统结构]