Journal
IEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITY
Volume 10, Issue 8, Pages 1617-1629Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIFS.2015.2421358
Keywords
Antenna selection; feedback; physical-layer security; secrecy outage probability; wiretap channel
Funding
- National Natural Science Foundation of China [61302140, 61372099]
- Engineering and Physical Sciences Research Council [EP/E500293/1] Funding Source: researchfish
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In this paper, we investigate the secrecy performance for a multiple-input multiple-output (MIMO) wiretap channel in the presence of a multiantenna eavesdropper. In particular, the legitimate transmitter uses transmit antenna selection (TAS) to transmit on a single antenna with the largest signal-to-noise ratio (SNR) while both the legitimate receiver and the eavesdropper adopt maximal ratio combining (MRC) for reception. We derive exact closed-form expressions for the probabilities of achieving positive secrecy rate and secrecy outage in the case of imperfect feedback due to feedback delay and/or feedback error. Furthermore, we derive the asymptotic secrecy outage probability at high SNR, which accurately reveals the secrecy diversity loss due to imperfect feedback. Simulation results are provided to verify our analytical results and illustrate the impact of imperfect feedback on the secrecy performance of such a wiretap system.
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