CAJ | 학술논문

为了提高大规模多用户多输入多输出( MU-MIMO)下行系统的能效，提出了一种基于发送天线选择技术的能效优化机制。首先建立了同时考虑发送功率与电路功耗的新的系统功耗模型，并基于该模型，分析了基站配置天线数目与所有接收终端用户数目对系统总功耗及能效的影响。然后通过理论推导得到了系统能效最优时的最优天线选择数目，并与使用全部天线时的系统能效进行比较。仿真结果表明，所提出的发送天线选择机制通过优化激活部分基站天线能够明显提高系统能效。在用户数为10、发送功率分别为40 W和10 W时，与使用全部天线相比，天线选择技术能够分别使得系统能效获得大约12%和78%的性能增益。
위료제고대규모다용호다수입다수출( MU-MIMO)하행계통적능효，제출료일충기우발송천선선택기술적능효우화궤제。수선건립료동시고필발송공솔여전로공모적신적계통공모모형，병기우해모형，분석료기참배치천선수목여소유접수종단용호수목대계통총공모급능효적영향。연후통과이론추도득도료계통능효최우시적최우천선선택수목，병여사용전부천선시적계통능효진행비교。방진결과표명，소제출적발송천선선택궤제통과우화격활부분기참천선능구명현제고계통능효。재용호수위10、발송공솔분별위40 W화10 W시，여사용전부천선상비，천선선택기술능구분별사득계통능효획득대약12%화78%적성능증익。
In order to improve the energy efficiency of the large scale multiuser multi-input multi-output (MU-MIMO) downlink system,energy efficiency optimization based on transmitting antenna selection is proposed in this paper. A new power consumption model is established,which considers not only the trans-mitting power but also the circuit power consumption. Based on this model,the effects of the number of transmitting antennas at the base station and the number of users at the receiver on the total power con-sumption as well as the energy efficiency are discussed respectively,and a detailed energy efficiency per-formance comparison is also made between the proposed antenna selection and the one using all of the transmitting antennas. Mathematical analysis and numerical simulations reveal that there exists an optimal number of selected antennas to maximize the energy efficiency,and the proposed antenna selection scheme in large scale MU-MIMO system can improve the energy efficiency significantly. Especially, when the number of users is 10,and the transmitting power is 40 W and 10 W,compared with that using all of the given transmitting antennas,the proposed antenna selection scheme achieves nearly 12% and 78% gain in energy efficiency,respectively.