多小区大规模MIMO系统下行能效分析  

Analysis of Energy Efficiency in Downlink Multi-cell Massive MIMO System

作　　者：汪鹏[1] 戴建新[2] 程崇虎[1] 王军[1] 李莎[1] 

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003 [2]南京邮电大学理学院,江苏南京210023

出　　处：《计算机技术与发展》2017年第1期160-163,168,共5页Computer Technology and Development

基　　金：江苏省博士后科研资助计划(1501073B);南京邮电大学自然科学基金(NY214108)

摘　　要：在大规模MIMO系统中,发送功率是随着天线数的增加而减少的。但是,在大规模MIMO系统中,由于随着天线数增加,电路功耗的影响也越来越大。考虑系统的功率模型不仅仅包括发送功率,还包括电路功率。采用迫零预编码方案,分析多用户多小区情形下大规模下行MIMO系统的能效,假定用户数已知,推导出系统能效与基站天线数和用户数的关系式,继而得到能效的最大解及对应的天线数。数值结果验证了分析的正确性。通过仿真结果可知,随着天线数的增加,用户平均接收速率显著增加,但由于电路功耗的增加,因此系统的能效存在一个最优值,这个值同时与用户数和发送功率有关。该结论对于绿色通信的应用有着重要的意义。The transmission power is decreased as the increasing number of antennas in massive MIMO systems. However, the effect of circuit power consumption is more serious when the transmitter is equipped with massive number of antennas. The system power model a- dopted includes not only transmission power but also the fundamental power for operating the circuit at the transmitter. The EE of the massive MIMO systems is analyzed with multi-cell using the zero forcing pre-coding scheme. Then assuming that the number of termi- nals is given in advance, the expression between EE and the number of antennas and user terminals is obtained, and the optimal EE and corresponding number of antennas can be worked out. The numerical result confLrms the truth of the analysis, which shows that the incre- ment of the antennas increases the average rate of the receivers,however,the corresponding increment of circuit power results in the opti- mal EE which is related to the parameter number of terminals and transmit power. This conclusion is of great significance to the green communication.

关 键 词：大规模MIMO 能效 多小区 电路功耗 

分 类 号：TN929.5[电子电信—通信与信息系统]