To build next-generation wireless systems, engineers must understand radio channels that fade in time, frequency, and space. Space-Time Wireless Channels presents a pragmatic, first-principles approach that integrates crucial techniques from communications, electromagnetics, and random process theory. It focuses on comprehension, with many examples, illustrations, and problems. Coverage includes electromagnetic description of space-time channels; first- and second-order statistics of fading channels; angle spectrum concepts; multiple antenna and multipath techniques; array design; and more.