Coherent Compensation based ISAC Signal Processing for Long-range Sensing

TL;DR

This paper proposes a coherent compensation method for ISAC signals to mitigate ISI and ICI in long-range sensing, enhancing SINR and expanding sensing range compared to traditional methods.

Contribution

It introduces a coherent compensation technique that increases useful signal power and improves SINR in OFDM-based ISAC systems for long-range detection.

Findings

Enhanced SINR of range-doppler map verified by simulations

Expanded sensing range demonstrated over traditional 2D-FFT methods

Effective mitigation of inter-symbol and inter-carrier interference

Abstract

Integrated sensing and communication (ISAC) will greatly enhance the efficiency of physical resource utilization. The design of ISAC signal based on the orthogonal frequency division multiplex (OFDM) signal is the mainstream. However, when detecting the long-range target, the delay of echo signal exceeds CP duration, which will result in inter-symbol interference (ISI) and inter-carrier interference (ICI), limiting the sensing range. Facing the above problem, we propose to increase useful signal power through coherent compensation and improve the signal to interference plus noise power ratio (SINR) of each OFDM block. Compared with the traditional 2D-FFT algorithm, the improvement of SINR of range-doppler map (RDM) is verified by simulation, which will expand the sensing range.