Dual-Functional Waveform Design with Local Sidelobe Suppression via OTFS Signaling

TL;DR

This paper proposes a novel dual-functional OTFS waveform design for integrated sensing and communication systems, optimizing sidelobe suppression and interference reduction to enhance radar and data performance.

Contribution

It introduces a joint design method for OTFS waveforms and filters using a majorization-minimization algorithm, addressing sidelobe and interference issues in ISAC.

Findings

Significant reduction in WISL and interference levels

Enhanced radar detection and communication data rates

Effective joint waveform and filter optimization

Abstract

Integrated sensing and communication (ISAC) is viewed as a key technology in future wireless networks. One of the main challenges in realizing ISAC is developing dual-functional waveforms that can communicate with communication receivers and perform radar sensing simultaneously. In this paper, we consider the joint design of a dual-functional orthogonal time-frequency space (OTFS) signal and a receiving filter for the ISAC system. The problem of ISAC waveform design is formulated as the minimization of the weighted integrated sidelobe level (WISL) of the ambiguity function and the interference term from ISAC waveform, with constraints on signal-to-noise ratio loss. The majorization-minimization algorithm combined with alternating iterative minimization is implemented to solve the optimization problem. Simulation results show that the WISL and the interference term can be significantly decreased to guarantee achievable data rates and detection performance.