共道干扰下多入多出系统功率分配最优化问题

摘要

Multiple-input multiple output (MIMO) technology can dramatically improve system capacity and spectrum efficiency, and has been applied in the next generation mobile communication network and broadband wireless networks as a core technology. In practice, especially in multi-user cases, the co-channel interference between MIMO links seriously affects the MIMO capacity performance. Therefore, we need to optimize the power allocation scheme of MIMO system to optimize the system capacity. In this paper, we present the signal model of MIMO system with co-channel interference and capacity analysis method for cohannel MIMO system based on maximizing mutual information. In the RIN-R SN space, the system optimization problems are classified into 4 situations. For each situation, the feasible optimized power allocation schemes and the applicability of corresponding scheme are proposed. Finally, we point out the main problems and further research directions in this research field.%多输入多输出（MIMO）技术可以极大地提高系统容量和频带利用率，是下一代移动通信网和宽带无线网络的核心技术。在实际情况中，尤其是在多用户情况下，MIMO链路间存在的共道干扰将会对其容量性能产生严重影响，此时需要对MIMO系统功率分配方案进行优化设计。给出了共道干扰MIMO系统的信号模型，从最大化互信息角度分析共道MIMO系统容量，提出在干扰噪声比一信噪比（R IN-RSN）空间将系统优化问题归为4种情况，并给出可行的功率分配优化方案，同时分析了方案的适用性，指出亟待解决的主要问题和进一步的研究方向。