Coded Modulation Systems (Information Technology: Transmission, Processing and Storage)

Coded Modulation Systems is an introduction to the subject of coded modulation in digital communication. It is designed for classroom use and for anyone wanting to learn the ideas behind this modern kind of coding. Coded modulation is signal encoding that takes into account the nature of the channel over which it is used. Traditional error correcting codes work with bits and add redundant bits in order to correct transmission errors. In coded modulation, continuous time signals and their phases and amplitudes play the major role. The coding can be seen as a patterning of these quantities. The object is still to correct errors, but more fundamentally, it is to conserve signal energy and bandwidth at a given error performance. The book divides coded modulation into three major parts. Trellis coded modulation (TCM) schemes encode the points of QAM constellations; lattice coding and set-partition techniques play major roles here. Continuous-phase modulation (CPM) codes encode the signal phase, and create constant envelope RF signals. The partial-response signaling (PRS) field includes intersymbol interference problems, signals generated by real convolution, and signals created by lowpass filtering. In addition to these topics, the book covers coding techniques of several kinds for fading channels, spread spectrum and repeat-request systems. The history of the subject is fully traced back to the formative work of Shannon in 1949. Full explanation of the basics and complete homework problems make the book ideal for self-study or classroom use. "Coded Modulation Systems introduces the subject of coded modulation in digital communication. It is designed for classroom use and for anyone wanting to learn this modern kind of coding. Coded modulation is signal encoding that takes into account continuous-time signals in the physical channel and their phases and amplitudes as they really exist. The attitudes behind coded modulation mark a paradigm shift that occurred after 1975, which led to a major awakening of interest in coding theory and practice."--BOOK JACKET. Introduction to Coded Modulation....Pages 1-15 Modulation Theory....Pages 17-74 Coding and Information Theory....Pages 75-131 Set-partition Coding....Pages 133-190 Continuous-phase Modulation Coding....Pages 191-281 PRS Coded Modulation....Pages 283-361 Introduction to Fading Channels....Pages 363-413 Trellis Coding on Fading Channels....Pages 415-474 A coded modulation is a coded communication that is designed against the analog channel over which it is used.