Full-Duplex Transmission Optimization for Bi-directional MIMO links with QoS Guarantees

TL;DR

This paper introduces an iterative algorithm for optimizing full-duplex MIMO links that minimizes transmit power while satisfying QoS, significantly reducing residual self-interference and outperforming existing solutions in power efficiency and complexity.

Contribution

The paper presents a novel iterative power minimization algorithm with closed-form beamformer expressions for full-duplex MIMO systems with QoS guarantees.

Findings

Residual self-interference reduced below -110dB

Outperforms recent solutions in power efficiency

Lower computational complexity

Abstract

We consider a bi-directional Full-Duplex (FD) Multiple-Input Multiple-Output (MIMO) communication system in which nodes are capable of performing transitter (TX)- Receiver (RX) digital precoding/combining and multi-tap analog cancellation, and have individual Signal-to-Interference-plus-Noise Ratio (SINR) requirements. We present an iterative algorithm for the TX powers minimization that includes closed-form expressions for the TX/RX digital beamformers at each algorithmic iteration step. Our representative simulation results demonstrate that the proposed algorithm can reduce residual Self-Interference (SI) due to FD operation to below -110dB, which is the typical noise floor level for wireless communications. In addition, our design outperforms relevant recent solutions proposed for 2-user MIMO systems (the so called MIMO X channel) in terms of both power efficiency and computational complexity.