大规模MIMO系统中能效优化设计

Energy efficiency optimization design in massive MIMO system

能量效率是判断大规模多输入多输出(MIMO)技术是否符合绿色通信的重要指标之一。文中建立一种电路功耗模型,分析了多用户MIMO通信系统的能量效率问题。首先,建立多用户MIMO通信系统的下行链路传输模型和以发射功耗和电路功耗为主的功耗模型;其次,根据提出的系统模型得出系统能效的关系式;最后,提出一种改进的注水功率分配算法,以实现系统能量效率的最大化。仿真结果表明,在多用户MIMO通信系统中,系统总功耗会随着基站天线数目和小区内用户数目的增加而增加,而系统的能量效率并不会随着吞吐量无限增加,而是先递增达到最大值后下降。

Energy efficiency is one of the important indicators to judge whether the massive multiple input multiple output(MIMO)technology conforms to green communication.In this paper,a circuit power consumption model is established to analyze the energy efficiency of multi-user MIMO communication system.Firstly,the downlink transmission model and the power consumption model based on transmission power and circuit power consumption are established.Secondly,the relational expression of system energy efficiency is obtained by means of the system model proposed in this paper.An improved waterfilling power allocation algorithm is proposed to maximize the energy efficiency of the system.The simulation results show that the total power consumption of the multi-user MIMO communication system increases with the increase of antennas in the base station and the users in the cell,and the energy efficiency of the system does not increase infinitely with increase of throughput,but increases first to the maximum and then decreases.