Abstract-In this paper we review the most peculiar and interesting information-theoretic and communications features of fading channels. We first describe the statistical models of fading channels which are frequently used in the analysis and design of communication systems. Next, we focus on the information theory of fading channels, by emphasizing capacity as the most important performance measure. Both single-user and multiuser transmission are examined. Further, we describe how the structure of fading channels impacts code design, and finally overview equalization of fading multipath channels.

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Spread spectrum signals is a class of signals that were designed primarily for use in digital communication systems to overcome either intentional or unintentional interference. We begin by illustrating the basic elements of a spread spectrum digital communication system. Next, we consider the transmission of a binary information sequence by means of binary PSK. Later, we discuss frequency‐hopped (FH) spread spectrum. Finally, we close with a section on commercial spread spectrum systems.

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