Dual-functional Radar-Communication Waveform Design under Constant-modulus and Orthogonality Constraints

TL;DR

This paper presents a novel method for designing dual-functional radar-communication waveforms that satisfy constant-modulus and orthogonality constraints, optimizing performance for radar detection and cellular transmission.

Contribution

It introduces an alternating minimization approach to solve a complex non-convex optimization problem for waveform design under multiple constraints.

Findings

The proposed method effectively reduces multi-user interference.

Waveform orthogonality and constant-modulus constraints are successfully maintained.

Numerical simulations demonstrate near-optimal performance.

Abstract

In this paper, we focus on constant-modulus waveform design for the dual use of radar target detection and cellular transmission. As the MIMO radar typically transmits orthogonal waveforms to search potential targets, we aim at jointly minimizing the downlink multi-user interference and the non-orthogonality of the transmitted waveform. Given the non-convexity in both orthogonal and CM constraints, we decompose the formulated optimization problem as two sub-problems, where we solve one of the sub-problems by singular value decomposition and the other one by the Riemannian conjugate gradient algorithm. We then propose an alternating minimization approach to obtain a near-optimal solution to the original problem by iteratively solve the two sub-problems. Finally, we assess the effectiveness of the proposed approach via numerical simulations.