摘要
该文针对WCDMA标准中采用的闭环分集技术,给出了RAKE接收算法模型及反馈的加权矢量算法,进而分析了时变衰落信道中存在反馈链路延迟时闭环发送分集的接收性能,并与开环分集技术的接收性能进行了比较,指出了开环和闭环发送分集技术适用的不同移动环境。理论推导及仿真结果表明闭环发送分集在低速移动和较低路径信噪比环境下具有优于开环分集的接收性能。
In this paper, the closed loop transmit diversity technique is investigated. The RAKE receiver model and the weighting vector algorithm are presented. Since the feedback delay in the practical systems has considerable effect on the receiver performance of the closed loop transmit diversity technique, the performance of the RAKE receiver with feedback delay in the time variant wireless channel is analyzed and compared with that of the open loop mode. Theoretical analysis and simulation results show that the closed loop transmit diversity technique outperforms the open loop technique in the environments with low speeds and low path signal-to-noise ratios.
出处
《电子与信息学报》
EI
CSCD
北大核心
2005年第9期1441-1445,共5页
Journal of Electronics & Information Technology
基金
国家自然科学基金(60496311)资助课题
关键词
第三代移动通信
WCDMA
RAKE接收机
发送分集
闭环发送分集
Third generation mobile communications, WCDMA, RAKE receiver, Transmit diversity, Closed loop transmit diversity
