2017/09/06 by Saba Asaad, Ali Bereyhi, Asaad, Saba +7
Computer Science · Engineering · #Advanced MIMO Systems Optimization #Cooperative Communication and Network Coding #FOS: Computer and information sciences #Information Theory (cs.IT) #Wireless Communication Security Techniques
paper · pdf · doi:10.48550/arxiv.1709.01868
openalex publication_date 2017/09/06 · openalex created_date 2022/09/26 · openalex updated_date 2026/07/28
This paper studies the impact of transmit antenna selection on the secrecy\nperformance of massive MIMO wiretap channels. We consider a scenario in which a\nmulti-antenna transmitter selects a subset of transmit antennas with the\nstrongest channel gains. Confidential messages are then transmitted to a\nmulti-antenna legitimate receiver while the channel is being overheard by a\nmulti-antenna eavesdropper. For this setup, we approximate the distribution of\nthe instantaneous secrecy rate in the large-system limit. The approximation\nenables us to investigate the optimal number of selected antennas which\nmaximizes the asymptotic secrecy throughput of the system. We show that\nincreasing the number of selected antennas enhances the secrecy performance of\nthe system up to some optimal value, and that further growth in the number of\nselected antennas has a destructive effect. Using the large-system\napproximation, we obtain the optimal number of selected antennas analytically\nfor various scenarios. Our numerical investigations show an accurate match\nbetween simulations and the analytic results even for not so large dimensions.\n