Efficient Relay Beamforming Design with SIC Detection for Dual-Hop MIMO Relay Networks

TL;DR

This paper introduces two novel linear beamforming schemes for dual-hop MIMO relay networks that leverage SIC detection and channel state information to significantly improve ergodic capacity.

Contribution

The paper proposes new relay beamforming methods based on MF and RZF techniques utilizing CSI, combined with SIC detection at the destination, to enhance capacity in MIMO relay systems.

Findings

Proposed beamformers outperform existing schemes in ergodic capacity.

Utilization of QRD filter with SIC achieves maximum spatial multiplexing gain.

Simulation results validate the effectiveness of the new beamforming designs.

Abstract

In this paper, we consider a dual-hop Multiple Input Multiple Output (MIMO) relay wireless network, in which a source-destination pair both equipped with multiple antennas communicates through a large number of half-duplex amplify-and-forward (AF) relay terminals. Two novel linear beamforming schemes based on the matched filter (MF) and regularized zero-forcing (RZF) precoding techniques are proposed for the MIMO relay system. We focus on the linear process at the relay nodes and design the new relay beamformers by utilizing the channel state information (CSI) of both backward channel and forward channel. The proposed beamforming designs are based on the QR decomposition (QRD) filter at the destination node which performs successive interference cancellation (SIC) to achieve the maximum spatial multiplexing gain. Simulation results demonstrate that the proposed beamformers that fulfil both the intranode array gain and distributed array gain outperform other relaying schemes under different system parameters in terms of the ergodic capacity.