基于多天线相关信道协方差反馈,提出一种低复杂度自适应正交幅度调制(QAM)机制以提高系统发送速率。根据最小误比特率(BER)准则,建立了最优空时分组码(STBC)预编码方案。并在保证系统可靠性要求下,针对不同的信道衰落条件选取合适的QAM星座图级别。结果表明所建议机制具有低实现复杂度、低反馈带宽开销和高数据流通率等优点。
A low-complexity adaptive quadrature amplitude modulation (QAM) scheme was presented to increase throughput for multi-antenna communication system with covariance feedback. The optimal STBC precoding was achieved according to the criteria of minimizing average bit error rate (BER). An adaptive constellation levels were selected for different channel states to increase throughput under the constraint of the system's BER. The results show good performance,low realization complexity and low feedback overhead.