东南大学学报（英文版）2005，Vol.21Issue(4)：393-397,5.
直扩超宽带系统在室内密集多径下的多址性能
Multi-access performance of DS UWB system under indoor dense multi-path channel
摘要
Abstract
The performance of multi-user code to direct spreading bi-phase shift keying (DS-BPSK) direct impulse ultra wideband (UWB) systems under indoor multi-user and multi-path environment is analyzed and simulated. The system output signals with Rake receiver are derived, then a simple and practical code selection scheme is given; i. e., with a large occupation to empty ratio of the repeating pulses, directly choosing those random or pseudo-random user codes with enough length and good co-relative orthogonal features will make the performance of DS-BPSK approximate the optimum and, so there is no need to carefully design the code or its type. The system multi-access performances are simulated using Gold sequence and PN codes as multi-user codes under CM1-CM4 multi-path channels. Simulation results prove that the proposed scheme is feasible.关键词
超宽带/多用户/多径/Gold码/直接序列/RakeKey words
ultra wideband/multi-access/multi-path/Gold code/direct sequence/Rake分类
信息技术与安全科学引用本文复制引用
樊祥宁,倪剑强,毕光国..直扩超宽带系统在室内密集多径下的多址性能[J].东南大学学报（英文版）,2005,21(4):393-397,5.基金项目
The National High Technology Research and Development Program of China (863 Program) (No. 2001AA123042,2003AA123330, 2005AA123320). （863 Program）
