Dual-Function MIMO Radar Communications System Design Via Sparse Array Optimization

TL;DR

This paper introduces a novel dual-function MIMO radar-communications system that embeds data into sparse antenna array configurations, achieving high data rates while maintaining radar performance.

Contribution

It proposes a new sparse array optimization technique for embedding communication data into MIMO radar emissions, enabling high data rates with practical antenna selection schemes.

Findings

Achieves megabits per second data rates with sparse array reconfiguration.

Demonstrates effective symbol and bit error rates through simulations.

Provides a regularized antenna selection scheme for practical implementation.

Abstract

Spectrum congestion and competition over frequency bandwidth could be alleviated by deploying dual-function radar-communications systems, where the radar platform presents itself as a system of opportunity to secondary communication functions. In this paper, we propose a new technique for communication information embedding into the emission of multiple-input multiple-output (MIMO) radar using sparse antenna array configurations. The phases induced by antenna displacements in a sensor array are unique, which makes array configuration feasible for symbol embedding. We also exploit the fact that in a MIMO radar system, the association of independent waveforms with the transmit antennas can change over different pulse repetition periods without impacting the radar functionality. We show that by reconfiguring sparse transmit array through antenna selection and reordering waveform-antenna paring, a data rate of megabits per second can be achieved for a moderate number of transmit antennas. To counteract practical implementation issues, we propose a regularized antenna selection based signaling scheme. The possible data rate is analyzed and the symbol/bit error rates are derived. Simulation examples are provided for performance evaluations and to demonstrate the effectiveness of proposed DFRC techniques.