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This book introduces various signal processing approaches to enhance physical layer secrecy in multi-antenna wireless systems. Wireless physical layer secrecy has attracted much attention in recent years due to the broadcast nature of the wireless medium and its inherent vulnerability to eavesdropping. While most articles on physical layer secrecy focus on the information-theoretic aspect, we focus specifically on the signal processing aspects, including beamforming and precoding techniques for data transmission and discriminatory training schemes for channel estimation. The discussions will cover cases with collocated and with distributed antennas, i.e., relays. The topics covered will be of interest to researchers in the signal processing community as well to practitioners and engineers working in this area. This book will also review recent works that apply these signal processing approaches to more advanced wireless systems, such as OFDM systems, multicell systems, cognitive radio, multihop networks etc. This will draw interest from researchers that wish to pursue the topic further in these new directions. This book is divided into three parts: (i) data transmission, (ii) channel estimation and (iii) advanced applications. Even though many works exist in the literature on these topics, the approaches and perspectives taken were largely diverse. This book provides a more organized and systematic view of these designs and to lay a solid foundation for future work in these areas. Moreover, by presenting the work from a signal processing perspective, this book will also trigger more research interest from the signal processing community and further advance the field of physical layer secrecy along the described directions. This book allows readers to gain basic understanding of works on physical layer secrecy, knowledge of how signal processing techniques can be applied to this area, and the application of these techniques in advanced wireless applications.

Adaptive antennas --- Antenna radiation patterns --- Roaming (Telecommunication) --- Mathematical models. --- Call handoff (Telecommunication) --- Handoffs (Telecommunication) --- Handover (Telecommunication) --- Open connectivity (Telecommunication) --- Virtual roaming (Telecommunication) --- Antenna lobe patterns --- Antenna patterns --- Antennas (Electronics) --- Directional patterns of antennas --- Field intensity patterns of antennas --- Field patterns of antennas --- Lobe patterns, Antenna --- Patterns, Antenna radiation --- Radiation patterns, Antenna --- Radiation patterns --- Engineering. --- Computer security. --- Electrical engineering. --- Signal, Image and Speech Processing. --- Systems and Data Security. --- Communications Engineering, Networks. --- Electric engineering --- Engineering --- Computer privacy --- Computer system security --- Computer systems --- Computers --- Cyber security --- Cybersecurity --- Electronic digital computers --- Protection of computer systems --- Security of computer systems --- Data protection --- Security systems --- Hacking --- Construction --- Industrial arts --- Technology --- Protection --- Security measures --- Electromagnetic fields --- Radio relay systems --- Wireless communication systems --- Telecommunication. --- Electric communication --- Mass communication --- Telecom --- Telecommunication industry --- Telecommunications --- Communication --- Information theory --- Telecommuting --- Signal processing. --- Image processing. --- Speech processing systems. --- Computational linguistics --- Electronic systems --- Modulation theory --- Oral communication --- Speech --- Telecommunication --- Singing voice synthesizers --- Pictorial data processing --- Picture processing --- Processing, Image --- Imaging systems --- Optical data processing --- Processing, Signal --- Information measurement --- Signal theory (Telecommunication) --- Security measures.