Self-Interference Suppression for the Full-Duplex Wireless Communication with Large-Scale Antenna

TL;DR

This paper introduces a shared-antenna full-duplex massive MIMO model that leverages a single antenna array for simultaneous transmission and reception, demonstrating SI suppression with large antenna arrays.

Contribution

It proposes a novel shared-antenna full-duplex massive MIMO model and proves SI suppression in large antenna regimes using common linear processing methods.

Findings

SI can be suppressed as the number of antennas increases

The model combines benefits of full-duplex and TDD massive MIMO

Linear processing methods are effective for SI suppression

Abstract

In this letter, we proposed a shared-antenna full-duplex massive MIMO model for the multiuser MIMO system. This model exploits a single antenna array at the base station (BS) to transmit and receive the signals simultaneously. It has the merits of both the full-duplex system and the time-division duplex (TDD) massive MIMO system, i.e., the high spectral efficiency and the channel reciprocity. We focus on the zero-forcing (ZF) and the maximal-ratio transmission/maximal-ratio combining (MRT/MRC) linear processing methods, which are commonly used in the massive MIMO system. As the main finding, we prove that the self-interference (SI) in a shared-antenna full-duplex massive MU-MIMO system can be suppressed in the completely dependent uplink and downlink channels when the number of antennas becomes large enough.