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Performance Analysis of Downlink Time Switched Transmit Diversity in the WCDMA LCR-TDD System

机译:WCDMA LCR-TDD系统中下行时间切换发射分集的性能分析

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摘要

A downlink transmit diversity scheme is proposed for WCDMA low chip rate (1.28 Mcps) Time Division Duplex (LCR-TDD) systems. In the proposed Time Switched Transmit Diversity (TSTD) scheme, two spatially separated antennas are alternately used at a base station in order to transmit consecutive sub-frames on the downlink physical channels. The proposed TSTD scheme takes advantage of the frame structure of the WCDMA LCR-TDD. where TSTD transmission is possible with a single power amplifier. Simply adding switching components in front of the transmit antennas yields a considerable gain compared with a non-diversity mode system. A new power control algorithm is also proposed for generating power control command for efficient use of TSTD. A performance gain of up to 5 dB, compared with a non-diversity scheme, is achieved in terms of the frame error rate for varying Eb/No and mobile speeds. From the viewpoint of both complexity and performance, the TSTD scheme is a simple and effective transmit diversity method that can increase downlink capacity in the WCDMA LCR-TDD systems.
机译:针对WCDMA低码片速率(1.28 Mcps)时分双工(LCR-TDD)系统,提出了一种下行链路发射分集方案。在提出的时间交换发射分集(TSTD)方案中,在基站上交替使用两个空间分离的天线,以便在下行链路物理信道上发送连续的子帧。所提出的TSTD方案利用了WCDMA LCR-TDD的帧结构。使用单个功率放大器可以传输TSTD的地方。与非分集模式系统相比,只需在发射天线的前面添加开关组件即可获得可观的增益。还提出了一种新的功率控制算法,用于生成功率控制命令,以有效利用TSTD。与非分集方案相比,在变化的Eb / No和移动速度下的帧错误率方面,可实现高达5 dB的性能增益。从复杂性和性能的角度来看,TSTD方案是一种简单有效的发射分集方法,可以增加WCDMA LCR-TDD系统中的下行链路容量。

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