摘要
在无法获得稳定的全网同步特殊情况下,异步DS-CDMA系统是一种维持通信网络畅通的有效途径。该文首先分析了异步DS-CDMA多用户系统下多用户干扰(MAI)产生机理以及对系统性能带来的影响,在仿真环境下建立了异步DS-CDMA多用户系统模型,然后对三种扩频序列的相关特性进行仿真分析。比较分析了不同接入时延误差和不同失步用户数两种情况下,系统使用不同扩频序列时在AWGN信道下的误码率特性。分析表明,混沌序列是更加满足异步DS-CDMA系统的扩频序列,论文结果对可靠通信系统研究具有参考价值。
In case of that the entire network synchronization is out of control,the asynchronous DS-CDMA system is one of the effective approaches to maintain communication network works.The cause from MAI and its influence to the system performance in asynchronous system has been studied in this paper.The correlation properties of three kinds of spreading sequence have been analyzed under the simulation environment of multi-user asynchronous DS-CDMA system.The performance of code error rate in AWGN channel using different spreading sequences has been compared and analyzed in the situations with different access delay and different number of asynchronous users.Analysis shows that Logistic sequence is more suitable for asynchronous DS-CDMA system.The results of this paper could be of the reference for the reliable communication system development.
出处
《微波学报》
CSCD
北大核心
2011年第5期89-92,共4页
Journal of Microwaves
基金
国家自然科学基金(60673143)
浙江省科技计划(2006C21020)
