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## Antenna selection strategies for wiretap channels

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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.

Chapter Contents:

• 4.1 Introduction
• 4.2 Single transmit antenna selection
• 4.2.1 Index of the selected antenna
• 4.2.2 Secrecy performance metrics
• 4.2.3 Secrecy performance of single TAS
• 4.3 Transmit antenna selection with Alamouti coding
• 4.3.1 Indices of the two selected antennas
• 4.3.2 Transmission with Alamouti coding
• 4.3.3 Secrecy performance of TAS-Alamouti and TAS-Alamouti-OPA
• 4.4 Antenna selection in full-duplex wiretap channels
• 4.4.1 Transmit and receive antenna switching
• 4.4.2 Secrecy performance of the full-duplex wiretap channel with antenna switching
• 4.4.3 Other antenna selection problems in full-duplex wiretap channels
• 4.5 Single TAS with imperfect feedback and correlation
• 4.5.1 Single TAS with imperfect feedback
• 4.5.2 Single TAS with antenna correlation or channel correlation
• 4.6 Conclusion
• References

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