Abstract

Massive multiple-input multiple-output (MIMO) system installs a large number of antennas on the base station (BS), which requires one radio frequency (RF) chain for each antenna. When the number of antennas is small, the power consumption of the RF chains is negligible compared with the transmitting power. However, with the increase of antennas and RF chains, the ratio of the RF chains power consumption to the total transmitting power is gradually increasing. Therefore, the energy efficiency (EE) of the system tends to be saturated gradually and decreases with the further increase of antennas. To improve EE in massive MIMO systems, an antenna selection method by switching antenna dynamically with channel state information (CSI) is proposed in this paper, and trade-off between EE and spectral efficiency of the system is addressed.

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