一种基于线性离散码的发射天线选择方案
doi: 10.3724/SP.J.1146.2005.00980
Transmit Antenna Selection for Linear Dispersion Codes
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摘要: 为了充分利用多天线系统的性能增益，该文提出了一种基于线性离散码的发射天线选择(LDC-TAS)方案。在准静态信道环境下，该文比较了所提方案的3种天线选择准则：最大信道增益准则，最大容量准则和最大化最小后验SNR准则。仿真数据显示，在不同的调制方式如QPSK，8PSK和16QAM环境下，最大化最小后验SNR准则比其他两种准则表现出更好的性能。在相同的频谱效率下，与BLAST-TAS相比，所提方案表现出明显的分集增益；在低信噪比环境下，与STBC-TAS相比，仍有一定的性能增益。
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关键词:
- 天线选择;线性离散码;线性接收机
Abstract: In an effort to utilize the advantage of using multiple antennas, transmit antenna selection for linear dispersion codes (LDC-TAS) is proposed in this paper. Three criteria are presented: maximum channel gain, maximum capacity and max-min post-SNR, for selecting the optimal transmit antennas when linear, coherent receiver is used over a slowly varying channel. Simulation results suggest that the max-min post-SNR criterion outperforms the other selection methods in a variety of modulation modes, such as QPSK, 8PSK and 16QAM. Compared with BLAST-TAS, under the same spectral efficiency, the proposed scheme shows significant diversity advantage. In low SNR environment, LDC-TAS is still better than STBC-TAS. -
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