Performance tradeoffs between maximum ratio transmission and switched-transmit diversity
Performance tradeoffs between maximum ratio transmission and switched-transmit diversity
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最大比率传输和切换传输分集之间的性能权衡
DOI：
10.1109/pimrc.2000.881665
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
T. Ng
中科院分区：
文献类型：
--
作者：
C. Tse;K. Yip;T. Ng
实施最大传动比传输 (MRT) 系统并非易事。另外，交换式发射机分集 (STD) 系统的实施难度较小，但与 MRT 系统相比，其性能并不理想。如果差异不显着，则 STD 系统的实现优势超过了较小的性能损失，因此这些系统对于实际实现来说是理想的。本文比较了瑞利衰落条件下 2/spl 次/1、2/spl 次/2 和 4/spl 次/（发射天线/spl 次/接收天线）配置下 MRT 和 STD 系统的性能。发现对于2/spl times/1和2/spl times/2配置，差异仅为约1dB，这表明可以在不牺牲太多性能的情况下利用STD系统的实现简单性。然而，对于 4/spl 次/配置，差异约为 3 dB。相当大的损耗促使系统设计者更加仔细地考虑 STD 和 MRT 系统的实现方面和性能之间的权衡。
Implementation of maximum ratio transmission (MRT) systems is not a trivial task. Alternatively, switched-transmitter diversity (STD) systems are less difficult to implement, but their performance is suboptimal when compared to MRT systems. If the difference is not significant, implementation advantages of STD systems outweigh the minor performance loss so that these systems are desirable for practical implementations. This paper compares the performances between MRT and STD systems under Rayleigh-fading conditions for 2/spl times/1, 2/spl times/2 and 4/spl times/ (transmit antennas/spl times/receive antennas) configurations. It is found that the differences are only about 1 dB for the 2/spl times/1 and 2/spl times/2 configurations, indicating that implementation simplicity of a STD system can be utilized without sacrificing too much performance. However, the difference is around 3 dB for the 4/spl times/ configuration. The considerably larger loss prompts system designers to consider more critically on the tradeoffs between implementation aspects and performances of STD and MRT systems.