Ziemer and Tranter provide a thorough treatment of the principles ofcommunications at the physical layer suitable for college seniors,beginning graduate students, and practicing engineers. This is accomplished by providing overviews of the necessary backgroundin signal, system, probability, and random process theory required forthe analog and digital communications topics covered in the book. Inaddition to stressing fundamental concepts, sections on currentlyimportant areas such as spread spectrum, cellular communications, andorthogonal frequency-division multiplexing are provided. While the book is aimed at a two-semester course, more than enoughmaterial is provided for structuring courses according to the needs ofthe students and the preferences of the instructor.