旋转星座下匙孔信道的四元素准正交空时分组码研究

Constellations Rotation for Quaternion Quasi-rthogonal Space Time Block Code in Keyhole Channel

    摘要
  • 摘要: 提出了一种基于匙孔信道的旋转四元素准正交空时分组码（QQOSTBC-CR，Constellation Rotation Quaternion Quasi-Orthogonal Space Time Block Code），该码可以通过极化天线进行发射和接收，设计出发射天线数为8的QOSTPBC-CR，并对N=8的情况进行成对译码，最后与匙孔信道下传统旋转准正交空时分组码（QOSTBC-CR，Constellation Rotation Quasi-Orthogonal Space Time Block Code）、准正交空时分组码（QOSTBC，Quasi-Orthogonal Space Time Block Code）以及瑞利信道下QQOSTBC-CR进行了仿真比较。结果表明：对4个发射天线的情况，当BER=10-3时，BPSK和QPSK调制下本文所提QQOSTBC-CR分别比QOSTBC-CR有4.5dB和7dB的增益，分别比瑞利信道下QQOSTBC-CR有-4dB和-3dB的增益。

     

    Abstract:  A new kind of constellations rotation for quaternion quasi-orthogonal space time block code (QQOSTBC-CR) in keyhole channel is proposed. These codes can transmit and receive through dual-polarized antennas respectively. The QQOSTBC with eight transmit antennas are designed firstly. And pair-wise decoding algorithm is adopted for N=8. Finally, it is compared the QQOSTBCCR with the QOSTBC-CR (Constellation Rotation Quasi-Orthogonal Space Time Block Code) and QOSTBC (Quasi-Orthogonal Space Time Block Code）in the case of keyhole channel, and with the QQOSTBC-CR in the case of Rayleigh channel. Simulation results show that the new QQOSTBC-CR can provide a gain of 4.5dB/7dB than the QOSTBC-CR at the given BER of 10-3 for BPSK/QPSK in the condition of four transmit antennas and keyhole channel, the new QQOSTBC-CR can provide a gain of -4dB/-3dB than the QQOSTBC-CR in the case of Rayleigh channel for BER=10-3

     

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