多相序列长度改造的研究  

The research on length reconstructing of multiphase sequences

作　　者：丁中凤 贾志成[2] 张超[2] 

机构地区：[1]齐齐哈尔电业局,齐齐哈尔161000 [2]河北工业大学,东院486信箱天津300130

出　　处：《信息技术》2005年第7期21-23,共3页Information Technology

基　　金：国家自然科学基金资助项目(69972042)

摘　　要：CDMA系统中,多址的实现是靠具有特定相关性要求的扩频序列来完成的,而扩频序列越长,其自相关函数的主峰和旁瓣的比值就越大,相关性能就越好。由Suehiro构造的多相序列其长度等于相数的平方,相数小时,序列长度满足不了系统对处理增益的要求。为此,引入了伪周期序列的概念,对多相序列的长度进行了改造,提高了多相序列在实际应用中的可行性。In CDMA systems,the realization of multiple access can be achieved by the special sequences with correlation demand,if the spread spectrum sequences are longer, the ratio between the main peak value and the side peak value of the auto-correlation function is bigger,then the sequences can reach the correlation demand of the spread spectrum code in systems.The multiple phase sequence based on Suehiro's method has the direct ratio characteriste between its length and its phase numbers, its length is finite and the sequences (don't) adapt to application in practice.So,the pseudo-periodic sequences are introduced and the length of on multiphase sequences will be changed by reconstructing,then the feasibility of the multiphase sequences used in practice is improved.

关 键 词：码分多址 周期序列 伪周期序列 相关性 

分 类 号：TN914.53[电子电信—通信与信息系统]