下行 MU-MIMO 系统能效与频谱效率折中效用分析

摘要

针对下行多用户多输入多输出（Multi‐User Multiple‐Input Multiple‐Output ，MU‐MIMO）系统，建立了能够表达能量效率（energy‐efficient ，EE）与频谱效率（spectrum‐efficiency ，SE）折中关系的系统效用函数。由于该效用函数为非凸函数，为了获得最优的系统效用，提出了一种迭代用户功率分配算法。然后，给出了能够实现系统效用最大的传输模式选择方法。仿真结果表明，所提算法能够使得系统效用取得最大值。同时，还证明了在不同的效用偏好参数下，所提方案均可以获得最优系统效用。%For downlink multi‐user multiple‐input multiple‐output (MU‐MIMO) system ,utility function is established to express the tradeoff between energy‐efficiency (EE) and spectral efficiency (SE) .As the utility function is not a convex function ,an iter‐ative user power allocation algorithm is proposed to obtain the optimal system utility .In addition ,transmission mode selection method is provided to implement the maximum system utility .Simulation results show that the proposed algorithm can make the system achieve the maximum utility .Moreover ,it is proved that the proposed scheme can obtain the optimal system utility under the different utility preference parameters .