# Jamming-Resistant Receivers for the Massive MIMO Uplink

## TL;DR

This paper proposes a novel jamming-resistant receiver for massive MIMO uplink systems that estimates and mitigates jamming signals, significantly improving communication robustness under strong jamming attacks.

## Contribution

It introduces a method to estimate the jamming channel using unused pilots and designs filters to reject jamming, enhancing system resilience.

## Key findings

- The scheme significantly improves achievable rates compared to conventional receivers.
- It performs particularly well under strong jamming conditions.
- Analytical evaluation confirms the effectiveness of the proposed approach.

## Abstract

We design a jamming-resistant receiver scheme to enhance the robustness of a massive MIMO uplink system against jamming. We assume that a jammer attacks the system both in the pilot and data transmission phases. The key feature of the proposed scheme is that, in the pilot phase, we estimate not only the legitimate channel, but also the jamming channel by exploiting a purposely unused pilot sequence. The jamming channel estimate is used to constructed linear receive filters that reject the impact of the jamming signal. The performance of the proposed scheme is analytically evaluated using asymptotic properties of massive MIMO. The optimal regularized zero-forcing receiver and the optimal power allocation are also studied. Numerical results are provided to verify our analysis and show that the proposed scheme greatly improves the achievable rates, as compared to conventional receivers. Interestingly, the proposed scheme works particularly well under strong jamming attacks, since the improved estimate of the jamming channel outweighs the extra jamming power.