基于多天线相关信道的自适应格形编码QAM调制研究

Adaptive Trellis Code Quadrature Amplitude Modulation for Multi-Antenna Correlation Channels

为了提高系统数据流通率,结合空时预编码技术,提出一种基于多天线相关信道反馈的低复杂度自适应格形编码调制(TCM)系统.利用二维波束成型的变换作用,使得在大天线数情况下,也具有满空时编码速率.给出系统误比特率性能分析表达式,并在此基础上得到最优空时码预编码方式.在满足系统预设可靠性要求下,获得自适应格形编码正交幅度调制(QAM)设计准则.实验结果显示能获得高数据流通率.

Based on channel covariance feedback,a low-complexity adaptive trellis code modulation(TCM) scheme is proposed to increase multi-antenna system throughput.Full-rate is achieved for any number of transmit antennas by applying the precoding of space-time block code(Precoding STBC) and two-dimension beamforming.The optimal beamforming vectors and power allocation algorithm are derived according to minimizing average bit error rate(BER) criterion.Under the preset BER requirement,the adaptive design criteria of trellis code quadrature amplitude modulation(QAM) are achieved.The numerical results show that the proposed scheme can increase system data throughput significantly.