多天线WCDMA系统空时发送分集技术的性能分析

多天线WCDMA系统空时发送分集技术的性能分析

内容简介：研究了WCDMA系统4发送天线时可能存在的几种空时编码发送分集技术, 给出了各自的rake接收模型并研究了在衰落信道中的接收性能, 同时也与多天线的接收分集技术做了比较. 理论分析表明:在分集级数少的移动信道中, 各种多天线发送分集技术提供了很大的接收增益, 尤其是G4编码方案; 在多用户环境下, 与同级数的接收分集技术相比, 发送分集由于引入了多径及多用户干扰而需要在接收端采用干扰抑制技术.

Abstract：Several space-time coding based transmit diversity techniques for wideband code division multiple access (WCDMA) systems with four transmitter antennas are investigated. Performances of the rake receivers are analyzed and compared with those of the multi-antenna receive diversity techniques. Theoretical analysis shows that the multi-antenna transmit diversity techniques provide considerable performance gain at the mobile receiver in the wireless channel with less inherent multipath diversity, especially the G4 coding based scheme. Compared with the multi-antenna receive diversity techniques with the same diversity order, the transmit diversity techniques introduce much more multi-access plus multipath interference and require measures of interference suppression in the multi-user environments.

作者：杨馨, 方昕, 尤肖虎,

关键词：多天线, 发送分集, 空时编码, WCDMA,