Abstract
This paper studies the security aspect of a recently introduced “cell-free massive MIMO” network under a pilot spoofing attack. First, a simple method to recognize the presence of this type of an active eavesdropping attack to a particular user is shown. In order to deal with this attack, we consider the problem of maximizing the achievable data rate of the attacked user or its achievable secrecy rate. The corresponding problems of minimizing the power consumption subject to security constraints are also considered in parallel. Path-following algorithms are developed to solve the posed optimization problems under different power allocation to access points (APs). Under equip-power allocation to APs, these optimization problems admit closed-form solutions. Numerical results show their efficiency.
Highlights
We focus on solving optimization problems to provide specific solutions for cell-free systems in the case that a user is really suspected of being an eavesdropper
We have considered a cell-free MIMO network in the presence of an active eavesdropper
We have suggested maximization problems to maximize the achievable secrecy rate subject to quality-of-service constraints
Summary
1) Cell-Free Massive MIMO Networks: Cell-free massive MIMO has been recently introduced in [1]–[3] These papers showed that by proper implementation, cell-free massive MIMO can provide a uniformly good service to all users in the network and outperform small-cell massive MIMO in terms of throughput, and handle the shadow fading correlation more efficiently. In a typical small-cell massive MIMO system, the channel from an access point (AP) to a user is a single scalar. In a cell-free Massive MIMO system, all APs can liaise with each other via a central processing unit (CPU) to perform beamforming transmission tasks, and the effective channel (from an AP to a user) will take. The associate editor coordinating the review of this paper and approving it for publication was I.
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