Reconfigurable Holographic Surface-aided Distributed MIMO Radar Systems

TL;DR

This paper introduces a reconfigurable holographic surface (RHS) to enhance distributed MIMO radar systems, reducing power and cost while improving multi-target detection accuracy through novel amplitude-controlled beamforming.

Contribution

It proposes a new RHS-based distributed MIMO radar system and a beamforming scheme that maximizes detection accuracy without increasing hardware complexity.

Findings

RHS achieves beam steering by regulating element amplitude.

The proposed scheme outperforms traditional phased-MIMO radar.

Optimal spatial diversity and processing gain allocation enhances system performance.

Abstract

Distributed phased Multiple-Input Multiple-Output (phased-MIMO) radar systems have attracted wide attention in target detection and tracking. However, the phase-shifting circuits in phased subarrays contribute to high power consumption and hardware cost. To address this issue, an energy-efficient and cost-efficient metamaterial antenna array, i.e., reconfigurable holographic surface (RHS), has been developed. In this letter, we propose RHS-aided distributed MIMO radar systems to achieve more accurate multi-target detection under equivalent power consumption and hardware cost as that of distributed phased-MIMO radar systems. Different from phased arrays, the RHS achieves beam steering by regulating the radiation amplitude of its elements, and thus conventional beamforming schemes designed for phased arrays are no longer applicable. Aiming to maximize detection accuracy, we design an amplitude-controlled beamforming scheme for multiple RHS transceiver subarrays. The simulations validate the superiority of the proposed scheme over the distributed phased-MIMO radar scheme and reveal the optimal allocation of spatial diversity and coherent processing gain that leads to the best system performance when hardware resources are fixed.