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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 .
This paper studies several possible space-time coding transmit diversity techniques that the WCDMA system 4 may transmit when transmitting an antenna, presents its own rake reception model and studies its reception performance in fading channels, and at the same time, it also makes use of the multi-antenna receive diversity technique The theoretical analysis shows that in the mobile channel with a small number of diversity stages, various multi-antenna transmit diversity technologies provide a great reception gain, especially in the G4 coding scheme. In a multi-user environment, a diversity of receive diversity Compared with the technology, transmit diversity needs interference suppression technology at the receiving end due to the introduction of multipath and multi-user interference.