IRCI Free Colocated MIMO Radar Based on Sufficient Cyclic Prefix OFDM Waveforms

TL;DR

This paper introduces a cyclic prefix based MIMO-OFDM radar waveform design that achieves IRCI-free range reconstruction with optimal PAPR and SNR gain, resilient to beamforming errors, verified through simulations.

Contribution

It proposes a novel CP-based MIMO-OFDM waveform design for co-located radar that ensures IRCI-free range reconstruction and optimal PAPR, even with beamforming errors.

Findings

IRCI-free range reconstruction achieved regardless of beamforming errors

Maximum SNR gain obtained after range reconstruction

PAPR of 0dB achieved using Zadoff-Chu sequences

Abstract

In this paper, we propose a cyclic prefix (CP) based MIMO-OFDM range reconstruction method and its corresponding MIMO-OFDM waveform design for co-located MIMO radar systems. Our proposed MIMO-OFDM waveform design achieves the maximum signal-to-noise ratio (SNR) gain after the range reconstruction and its peak-to-average power ratio (PAPR) in the discrete time domain is also optimal, i.e., 0dB, when Zadoff-Chu sequences are used in the discrete frequency domain as the weighting coefficients for the subcarriers. We also investigate the performance when there are transmit and receive digital beamforming (DBF) pointing errors. It is shown that our proposed CP based MIMO-OFDM range reconstruction is inter-range-cell interference (IRCI) free no matter whether there are transmit and receive DBF pointing errors or not. Simulation results are presented to verify the theory and compare it with the conventional OFDM and LFM co-located MIMO radars.