Anti-jamming Transmission of Downlink Cell Free Millimeter-Wave MIMO System

TL;DR

This paper introduces a novel anti-jamming hybrid beamforming scheme for downlink millimeter-wave cell-free MIMO systems, enhancing resistance to jamming with practical channel statistics and low-complexity algorithms.

Contribution

It proposes an alternate optimization-based hybrid beamforming method that leverages second-order channel statistics and a low-complexity gradient ascent approach for improved anti-jamming performance.

Findings

AO-AJHBF outperforms existing schemes in simulations.

The method effectively utilizes channel statistics for anti-jamming.

Low computational complexity compared to SDR-based methods.

Abstract

In this letter, the maximization of resistible jamming power is studied for multi-user downlink millimeter-wave cell-free multiple-input-multiple-output (CF-MIMO) systems. We propose an alternate optimization-based anti-jamming hybrid beamforming (AO-AJHBF) scheme. For receiving beamforming, more practical prior about the jamming channel, i.e., second-order statistics rather than instantaneous information, is exploited via maximizing the generalized Rayleigh quotient. For transmitting beamforming, we use the max-min fairness principle and propose a low-complexity projected gradient ascent-based method to circumvent the excessive computation of semi-definite relaxation (SDR). Simulations verify the performance advantage of proposed AO-AJHBF over schemes based on weighted minimum mean square error and SDR methods.