Study of the Target Self-Interference in a Low-Complexity OFDM-Based Radar Receiver

Abstract

This paper investigates a radar-communications waveform sharing scenario. Particularly, it addresses the selfinterference phenomenon induced by independent single-point scatterers throughout a low-complexity monostatic OFDM-based radar receiver from a statistical viewpoint. Accordingly, an analytical expression of the post-processing signal-to-interferenceplus-noise-ratio is derived and detection performance is quantified in simulated scenarios for rectangular and non-rectangular pulses. Both metrics suggest that this phenomenon must be further handled.

Target Sidelobes Removal via Sparse Recovery in the Subband Domain of an OFDM RadCom System

“…y (i) is the targets pedestal component that strongly depends on 1) the target range-Doppler location and amplitude; 2) the data symbols. Its expression is not recalled here for conciseness [8]. This component can be considered as a random variable, shown to be white with power σ 2 i in the range-Doppler map (if symbols are zero-mean, independent and identically distributed and taken in proper constellations) [8].…”

“…Its expression is not recalled here for conciseness [8]. This component can be considered as a random variable, shown to be white with power σ 2 i in the range-Doppler map (if symbols are zero-mean, independent and identically distributed and taken in proper constellations) [8]. Hereafter, we will rather consider the pedestal component, namely the so-called random sidelobes, as deterministic (cf.…”

“…After a symbol removal step, the range-Doppler map is directly obtained through a two-dimensional discrete Fourier transform (2D-DFT). As for correlation-based techniques [5], the subband approach generates self-interference in the range-Doppler map; the latter is however characterized not only by a pedestal (also referred to as random sidelobes) but also by a target peak loss [8].…”

Successive Self-Interference Cancellation in a Low-Complexity WCP-OFDM Radar Receiver

“…the intercarrier-plus-interblock interference, or selfinterference from a target detection perspective. Provided that E{α} = 0, it has been proved that [4]…”

“…However, in practice, this approach was shown to result in a twofold self-interference phenomenon in the range-Doppler map [3], namely losses on the target peaks that translate into an increased white interference-plus-noise level, so that target masking is more likely to occur [4]. To address this issue while maintaining a low-computational complexity processing at the receiver, we here propose a Successive (self-) Interference Cancellation (SIC) algorithm inspired from the ad-hoc CLEAN procedure [5], [6].…”