摘要
第三代移动通信系统WCDMA的发送分集方式有两种：开环模式和闭环模式，其中开环模式采用基于空间－时间分组编码的STTD发送分集方式。本文针对WCDMA系统中的STTD发送方式，给出了利用公共导频信道进行信道估计，实现相干RAKE接收的模型算法、性能分析及仿真结果。仿真表明，在总发送比特能量相同的条件下，尤其是在接收机缓慢移动的情况下，采用STTD发送分集的RAKE接收性能优于单天线发送时的RAKE接收机的性能，而在高速移动情况下，STTD发送方式不能提供优于单天线发送时的接收性能。
： There are two modes of transmit diversity for the third generation mobile communication system WCDMA: open-loop mode and the close-loop mode. In the open-loop mode, STTD (Space Time Transmit Diversity) is employed. For the STTD , an algorithm using common pilot channel to estimate channel parameters is proposed. Algorithm used for coherent RAKE reception as well as its performance analysis and simulation results are also given. Simulation results demonstrate that for the same total transmitted bit-energy, performance of STTD RAKE receiver is superior to that of single antenna RAKE receiver. It is more evident when the receiver moves slowly. The same advantage can not be seen in STTD mode when the receiver is in high speed moving.
出处
《电路与系统学报》
CSCD
2001年第2期29-33,共5页
Journal of Circuits and Systems
基金
国家杰出青年基金项目资助(69725001)
