摘要
为了解决CDMA通信系统对于同信道干扰过于敏感的问题 ,提出了一种采用周期互补序列作为扩频码进行信号传输和接收的CDMA系统模型 ;在此基础上引入了虚拟码片的概念 ,并试图采用在原来扩频码中适当加入虚拟码片以构成扩展帧序列 ;再在接收端利用屏蔽回路滤除虚拟码片的方法来提高系统抗噪性能 .通过大量的系统仿真发现采用该方案能有效地抑制多径干扰并极大地减小小区内不同用户间的干扰影响 .
A Code division multiple Access (CDMA) system model has been used to tolerate the alternate current (AC) components of noise received if complementary code sequences are used, and extended frame with dummy chips have been developed to eliminate the Direct Current (DC) component included in interference. The dummy chips of a desired signal are removed by a masking circuit at the receiver.So that no DC component may be included in the interference caused by multi_path effect of the desired signal and only a little DC component may be included in the interference coming from other stations in the cell.
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
2001年第5期78-82,90,共6页
Journal of Harbin Engineering University
