Antenna selection, which has been recognised as an important technique to enhance physical layer security in multiple-input multiple-output wiretap channels, requires low feedback overhead and low hardware complexity. In this chapter, antenna selection strategies in different application scenarios for wiretap channels are reviewed in order to demonstrate their benefits in terms of enhancing secure transmissions. The basic idea of transmit antenna selection (TAS) is first detailed and then TAS with Alamouti coding is provided. Furthermore, antenna selection strategies in full-duplex wiretap channels are presented, followed by a discussion on the impact of imperfect feedback and correlation on the secrecy performance of TAS.
Antenna selection strategies for wiretap channels, Page 1 of 2
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