Security performance analysis for cell-free massive multiple-input multiple-output system with multi-antenna access points deployment in presence of active eavesdropping. (August 2022)

• Record Type: Journal Article
• Authors: Wang, Xiaoyu; Gao, Yuanyuan; Zhang, Guangna; Guo, Mingxi; Xu, Kui
• Is Part Of: International journal of distributed sensor networks. Volume 18:Number 8(2022)
• Publication Date: 2022-08
• Subjects: Cell-free massive multiple-input multiple-output -- physical layer security -- multi-antenna technology -- active eavesdropping -- achievable secrecy rate -- distributed power allocation scheme; Sensor networks -- Periodicals; Intelligent agents (Computer software) -- Periodicals; Multisensor data fusion -- Periodicals; 681.2
• DOI: 10.1177/15501329221114535
• Languages: English
• ISSNs: 1550-1329

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.