本文研究了不完全信道状态信息(CSI)对多输入多输出(MIMO)系统容量的影响.基于平均功率和平均误码率的约束条件,我们提出了一种利用不完全CSI进行功率自适应调制的优化设计方案.根据Wishart矩阵的统计分布,我们导出了该系统容量的封闭表达式.研究结果表明:在具有不完全CSI的MIMO系统中,利用不完全CSI进行设计可以显著地提高系统的容量.
In this paper, we investigate the effect of imperfect channel state information (CSI) on the capacity of mttltipleinput multiple-output (MIMO) systems.A design of variable power adaptive modulation using imperfect CSI,subject to an average power and BER constraint, is proposed. Based on the statistic distribution of Wishart matrix, we derive the capacity expression of such systems in a closed-form. The results show that our design is more robust to CSI imperfections than the system designed under a perfect CSI assumption.