Improvement of Interference Suppression Performance Using Antenna Selection of Mobile Terminal for Full-Duplex $4\times4$ MIMO System

This article presents an improvement of interference suppression between mobile terminals using the antenna selection method of a mobile terminal in a full-duplex MIMO system. In the system, a method of simultaneously transmitting and receiving a signal on the same frequency band in uplink and downlink between a base station and a mobile terminal has been studied. As a method of terminal-to-terminal interference suppression, a method of null beamforming for the first eigenvalue of the terminal-to-terminal channel by eigen-beamforming has been studied. The authors propose a method to realize further interference suppression by applying the antenna selection method to the mobile terminal when performing eigen-beamforming. The examination results of simulation using the ray tracing method and measurement in outdoor environment are reported assuming $4 \times 4$ MIMO in the frequency band of 12.9 GHz. From the evaluation results, the interference suppression effect by the antenna selection method is improved by about 3–5 dB compared with the conventional four element MIMO antenna.

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