一种基于线性离散码的发射天线选择方案

Transmit Antenna Selection for Linear Dispersion Codes

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。

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-rain post-SNR criterion outperforms the other selection methods in a variety of modulation modes, such as QPSK, SPSK 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.