Abstract
Modified transmit antenna selection (M-TAS)/Alamouti orthogonal space-time block coding (STBC) schemes have been shown to achieve superior error performance together with a reduced-rate feedback channel in the presence of feedback imperfections when compared to the conventional TAS/Alamouti-STBC schemes. By shifting the focus of the investigation, this paper answers the query on whether the modified schemes provide enhancements in also the secrecy outage probability (SOP) performance of multi-antenna schemes in wiretap channels. The exact expressions of the SOP for the modified TAS/Alamouti-STBC schemes in Rayleigh fading channels have been derived and validated via Monte Carlo simulations. Additionally, the deteriorating effects of active eavesdropping has been demonstrated by simulating the pilot contamination attacks (PCAs) on the feedback channel. The extensive investigation and comparisons to the conventional schemes have shown that M-TAS/Alamouti-STBC schemes employed at the transmission end of the legitimate link provide considerable enhancements in the secrecy rates of wireless communications systems in the presence of PCAs.
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