旋转星座下匙孔信道的四元素准正交空时分组码研究

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.

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

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).