Low Probability of Detection Communication Using Noncoherent Grassmannian Signaling

TL;DR

This paper introduces a noncoherent communication system using Grassmannian signaling and DSSS that offers enhanced covertness and competitive performance at low SNR, making it suitable for low probability of detection scenarios.

Contribution

It presents a novel noncoherent LPD communication scheme based on Grassmannian constellations, improving covertness and performance without requiring channel estimation.

Findings

Grassmannian signaling provides low BER at low SNR.

The system achieves low probability of detection compared to coherent schemes.

Simulations demonstrate practical security benefits of the proposed method.

Abstract

This paper proposes a noncoherent low probability of detection (LPD) communication system based on direct sequence spread spectrum (DSSS) and Grassmannian signaling. Grassmannian constellations enhance covertness because they tend to follow a noise-like distribution. Simulations showed that Grassmannian signaling provides competitive bit error rates (BER) at low signal-to-noise ratio (SNR) regimes with low probability of detection at the unintended receiver compared to coherent schemes that use QPSK or QAM modulation formats and need pilots to perform channel estimation. The results suggest the practicality and security benefits of noncoherent Grassmannian signaling for LPD communications due to their improved covertness and performance.