Intended for use in an undergraduate course in electrical engineering, this book provides a modern treatment of signals and systems. It will prepare students for senior-level courses in communication systems, control systems, and digital signal processing (as encountered in digital audio), radar, radio, astronomy, sonar, remote sensing, seismology, and biomedical engineering. Examples and drill problems and solutions are provided throughout the book.
Simon Haykin was a Canadian electrical engineer noted for his pioneering work in Adaptive Signal Processing with emphasis on applications to Radar Engineering and Telecom Technology. He was a Distinguished University Professor at McMaster University in Hamilton, Ontario, Canada.
Do not read this book for your introductory course in Signals and Systems. The book is long, verbose, difficult to read and containing unnecessary information (say tons of problems on electricity circuit). You should go for "Schaums Outlines: Signals and Systems".