Adaptive Detection of Structured Signals in Low-Rank Interference

TL;DR

This paper introduces adaptive detection schemes for structured signals in low-rank interference environments, employing GLRT and EM algorithms to improve detection in complex, unknown interference scenarios.

Contribution

It proposes novel GLRT-based detection methods utilizing EM for likelihood maximization, addressing unknown parameters in structured signal detection under interference.

Findings

Enhanced detection performance demonstrated through numerical experiments

Effective handling of unknown interference parameters

Robustness of proposed schemes in challenging interference conditions

Abstract

In this paper, we consider the problem of detecting the presence (or absence) of an unknown but structured signal from the space-time outputs of an array under strong, non-white interference. Our motivation is the detection of a communication signal in jamming, where often the training portion is known but the data portion is not. We assume that the measurements are corrupted by additive white Gaussian noise of unknown variance and a few strong interferers, whose number, powers, and array responses are unknown. We also assume the desired signals array response is unknown. To address the detection problem, we propose several GLRT-based detection schemes that employ a probabilistic signal model and use the EM algorithm for likelihood maximization. Numerical experiments are presented to assess the performance of the proposed schemes.