Security performance analysis for cell-free massive multiple-input multiple-output system with multi-antenna access points deployment in presence of active eavesdropping

Xiaoyu Wang, Yuanyuan Gao, Guangna Zhang, Mingxi Guo and Kui Xu

International Journal of Distributed Sensor Networks, 2022, vol. 18, issue 8, 15501329221114535

Abstract: This article investigates the influence of multiple-antenna deployment at access points on physical layer security under cell-free massive multiple-input multiple-output systems. To embody the concept of network multiple-input multiple-output, cell-free massive multiple-input multiple-output employs a great deal of geographically distributed access points, which jointly serve multiple users in the same frequency-time resource. Assuming a malicious active eavesdropper having knowledge of instantaneous channel state information, we derive the asymptotic closed-form expression of the achievable secrecy rate, which is used to evaluate network security performance. A distributed power allocation scheme is developed based on channel fading degrees of different users. All of access points distribute a larger proportion of local transmission power to the users with better channel conditions. We verified that the security performance of the multi-antenna access points outperforms that of the single one. Compared to equal power allocation, the proposed power control algorithm can further boost the network security performance.

Keywords: Cell-free massive multiple-input multiple-output; physical layer security; multi-antenna technology; active eavesdropping; achievable secrecy rate; distributed power allocation scheme (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:sae:intdis:v:18:y:2022:i:8:p:15501329221114535

DOI: 10.1177/15501329221114535

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