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针对多小区多用户多入多出(multi-user multiple-input multiple-output,MU-MIMO)系统的下行链路场景,首先在考虑电路功耗和发射功耗的实际功耗模型下,推导出系统能效与基站天线数及用户数的关系式.然后为最大化系统能效,建立了联合优化基站天线数与用户数的能效优化模型,并给出一种交替迭代搜索算法来简化该优化问题的求解,同时证明了其最优解的存在.最后仿真结果表明,基于天线数与用户数的优化配置关系提出的天线配置方案可以明显提升系统能效.
For the downlink scenario of multi-user multiple-input multiple-output (MU-MIMO) system, we first derive the real power model considering the circuit power consumption and transmit power consumption System energy efficiency and base station antenna number and number of users.At the end of this paper, to optimize the energy efficiency of the system, an energy efficiency optimization model is proposed to jointly optimize the number of antennas and the number of users in the base station and an alternative iterative search algorithm is proposed to simplify the optimization problem And the existence of its optimal solution is proved.At last, the simulation results show that the antenna configuration scheme based on the optimal configuration relationship between the number of antennas and the number of users can obviously improve the system energy efficiency.