论文部分内容阅读
针对匙孔信道下4天线的Jafarkhani码和TBH码的QSTBC码阵系统,对QSTBC的编码结构进行4参数相位旋转,推导出QSTBC-MIMO瞬时输出信噪比表达式,并利用该瞬时输出信噪比作为系统天线选择准则.4参数相位旋转解决多交叉归零问题,使信道矩阵正交化,消除码间串扰,降低最大似然解码复杂度,从而改善系统性能.仿真结果表明:基于相位旋转的QSTBC系统能够获得较传统QSTBC系统更好的性能.采用相位旋转的同时加入天线选择技术的QSTBC系统的性能更好.在相同信噪比条件下,最可行的方法是采用相位旋转加接收端天线选择.
Aiming at the 4-antenna Jafarkhani code and TBH code QSTBC matrix system in keyhole channel, the QSTBC coding structure is rotated by 4 parameters to derive the QSTBC-MIMO instantaneous output signal-to-noise ratio expression and use the instantaneous output signal noise Ratio as the system antenna selection criteria.4 Parameter phase rotation to solve the problem of multiple cross-zeroing, orthogonalization of the channel matrix to eliminate intersymbol interference, reduce the maximum likelihood decoding complexity, thereby improving system performance.The simulation results show that: based on the phase rotation QSTBC system can get better performance than the traditional QSTBC system.With the phase rotation of the QSTBC system with antenna selection technology performance is better.Under the same SNR conditions, the most viable method is to use the phase rotation plus the receiver Antenna selection.