Sensing-Assisted Receivers for Resilient-By-Design 6G MU-MIMO Uplink

TL;DR

This paper proposes sensing-assisted receiver strategies to enhance the resilience of 6G MU-MIMO uplink communications against a fully informed adversarial jammer, ensuring higher sum rates under jamming conditions.

Contribution

It introduces novel receiver strategies that improve anti-jamming resilience in 6G MU-MIMO uplink scenarios with a fully aware jammer.

Findings

Proposed anti-jamming methods significantly increase sum rate.

Receiver strategies outperform non-protected systems under jamming.

Resilience holds even when jammer power exceeds legitimate transmitters.

Abstract

We address the resilience of future 6G MIMO communications by considering an uplink scenario where multiple legitimate transmitters try to communicate with a base station in the presence of an adversarial jammer. The jammer possesses full knowledge about the system and the physical parameters of the legitimate link, while the base station only knows the UL-channels and the angle-of-arrival (AoA) of the jamming signals. Furthermore, the legitimate transmitters are oblivious to the fact that jamming takes place, thus the burden of guaranteeing resilience falls on the receiver. For this case we derive one optimal jamming strategy that aims to minimize the rate of the strongest user and multiple receive strategies, one based on a lower bound on the achievable signal-to-interference-to-noise-ratio (SINR), one based on a zero-forcing (ZF) design, and one based on a minimum SINR constraint. Numerical studies show that the proposed anti-jamming approaches ensure that the sum rate of the system is much higher than without protection, even when the jammer has considerably more transmit power and even if the jamming signals come from the same direction as those of the legitimate users.