## Coded Modulation SystemsCoded 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. |

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### Common terms and phrases

1REC 8PSK algorithm amplitude antenna asymptotic autocorrelation average AWGN AWGN channel bandwidth baseband binary bit error probability BPSK calculation carrier Chapter code rate coded modulation codeword coherence complex components continuous phase modulation convolutional codes CPFSK CPM signal data bit data symbols decoder defined delay denoted detection detector diversity dm\n encoder energy error event estimate Euclidean distance example fading channels Figure free distance frequency Gaussian given IEEE Trans input interleaving intersymbol interference interval lattice linear modulation log2 master constellation matched filter minimum distance modulation index noise normalized optimal orthogonal pulses output path loss phase PRS codes QPSK Rayleigh fading Rayleigh fading channel received signal response samples Section Shannon shown in Fig shows signal space spectral spectrum square distance subset selector tap set TCM codes theory throughput transmitted trellis codes upper bound Viterbi width zero

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Page 472 - Very low rate convolutional codes for maximum theoretical performance of spread-spectrum multipleaccess channels," IEEE Journal on Selected Areas in Communications, vol.

Page 473 - ... capacity-approaching irregular low-density parity-check codes, IEEE Trans. Inf. Theory, vol. 47, pp. 619-637, February 2001. [8] M. Luby, M. Mitzenmacher, M. Shokrollahi, and D. Spielman, Improved low-density parity check codes using irregular graphs, IEEE Trans. Inf. Theory, pp. 585-598, February 2001. [9] V. Sorokine, FR Kschischang, and S. Pasupathy, Gallager codes for CDMA applications: Part I, IEEE Trans. Commn., pp. 1660-1668, October 2000 and Gallager codes for CDMA applications: Part...