Chapter 3. Signal Processing Fundamentals
A key feature of this book is the signal processing approach to wireless communications. This chapter reviews the fundamentals of signal processing, providing critical mathematical background that is used in subsequent chapters. We start with a review of concepts from signals and systems, including continuous-time and discrete-time signals, linear time-invariant systems, Fourier transforms, bandwidth, the sampling theorem, and discrete-time processing of continuous-time signals. These basic signal concepts are used extensively in this book. Then we explain concepts from statistical signal processing, providing background on probability, random processes, wide-sense stationarity, ergodicity, power spectrum, ...
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