摘要
基于频率选择性衰落信道,分析了非理想信道估计条件下,多播与信号合并方式对直扩码分多址接入(DS-CDMA)分布天线系统前向链路性能的影响,提出了多径环境下分布天线系统多址接入的信号模型,推导得出了存在信道估计误差时前向链路中断概率的理论结果.研究表明,信道估计误差对前向链路性能的影响与系统的负荷有关,同时多播技术可有效对抗信道估计误差,降低前向链路中断概率.
Based on multi-path fading environment, the impact of simulcasting and signal combining methods on the forward-link performance in direct spreading code division multiplex access（DS-CDMA）distributed antenna systems with imperfect channel estimation was analyzed. A detailed multipath multi-access model for distributed antenna systems was proposed and exact outage probability expression was derived. The study shows that the impact of channel estimation errors varies with system load. Furthermore, forward-link simulcasting can decrease both the impact of channel estimation errors and the outage probability.
出处
《北京邮电大学学报》
EI
CAS
CSCD
北大核心
2005年第5期16-20,共5页
Journal of Beijing University of Posts and Telecommunications
基金
国家自然科学基金项目(90204001)
关键词
分布天线系统
多播
宏分集
非理想信道估计
distributed antenna systems
simulcasting
macro-diversity
imperfect channel estimation
