变长序列相关性与DS-CDMA性能分析

Correlation of Variable-Length Spreading Sequencesand Its Application in Performance Evaluation of DS-CDMA

基于对变长扩频序列相关特性的分析,研究了采用OVSF扩频序列的多速率异步DS CDMA系统性能,导出以序列非周期部分相关表示的多址干扰分析结果.数值分析结果表明,干扰用户序列长度对期望用户BER性能有较大影响,而期望用户所采用的序列长度对自身BER性能的影响较小.

Based on the analysis of the correlation properties of variablelength spreading sequences, the performance of the asynchronous multirate DSCDMA system employing orthogonal variable spreading factor (OVSF) sequences is studied. Analytical results of multiple access interference (MAI) are derived in terms of aperiodic partial correlation of the spreading sequences. The numerical results demonstrate that the sequence lengths of interfering users have significant effects on BER performance of desired users, while the effect of sequence length of desired users is negligible.