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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...

This book systematically describes the weld pool behavior in laser welding and its influencing factors from the perspectives of testing technology, theoretical calculation and process simulation technology, physical state transformation behavior of weld pools, and the impact of technical conditions on the weld pool behavior. The book covers extensive research achievements made in China in this field, some of which represent the latest cutting-edging researches conducted by the authors' research team. These latest research efforts mainly relate to the weld pool behavior of dual-beam laser...

The purpose of the book is to advance in the understanding of brain functions by defining a general framework for representation based on granular computing theory. The idea is to bring this mathematical formalism into the domain of fuzzy neural representation of visual cognition, setting the basis for a theory of image understanding and learning of visual tasks. Our granular system is abstracted from brain science and information science, and it can be embedded in a neural dynamical system, it is helpful to guide designing of brain like computer for the tasks of image understanding. In a...