Signal Processing Approaches to Secure Physical Layer Communications in Multi-Antenna Wireless Systems

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This book explores signal processing methods to improve physical layer secrecy in multi-antenna wireless systems, addressing the vulnerabilities of the wireless medium to eavesdropping. Unlike most literature that emphasizes the information-theoretic aspects, this work focuses on signal processing techniques, including beamforming, precoding for data transmission, and discriminatory training for channel estimation. It examines scenarios with both collocated and distributed antennas, such as relays, appealing to researchers and engineers in the signal processing field. Additionally, it reviews recent applications of these techniques in advanced wireless systems like OFDM, multicell systems, cognitive radio, and multihop networks, encouraging further exploration in these areas. The book is structured into three parts: data transmission, channel estimation, and advanced applications. While existing literature covers these topics, this book offers a more organized perspective, establishing a solid foundation for future research. By presenting these concepts through a signal processing lens, it aims to stimulate further interest and advancement in the field of physical layer secrecy. Readers will gain a foundational understanding of physical layer secrecy and how signal processing techniques can be applied in advanced wireless contexts.