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IEEE Communications Magazine

Issue 12 • Date Dec. 1991

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Displaying Results 1 - 6 of 6
  • Combined equalization and coding using precoding

    Publication Year: 1991, Page(s):25 - 34
    Cited by:  Papers (163)  |  Patents (73)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (901 KB)

    Recently developed techniques that achieve the joint objectives of increasing the signaling rate so as to use the maximum possible channel bandwidth, and then using powerful equalization techniques to cope with the resulting distortion are reviewed. These techniques generalize the Tomlinson-Harashima precoding techniques, which were proposed more than 20 years ago. The principal classes of classic... View full abstract»

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  • Advances in constant envelope coded modulation

    Publication Year: 1991, Page(s):36 - 45
    Cited by:  Papers (43)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (927 KB)

    An overview is given of recent advances in constant envelope combined coding and modulation. Modulation codes and trellises are discussed, and major classes of trellis modulation codes are described. Continuous phase modulation is defined, and concatenations of phase codes and convolutional codes are examined. The ultimate capability of phase modulation coding and the size of CPM trellis codes are... View full abstract»

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  • Multi-h phase-coded modulation

    Publication Year: 1991, Page(s):46 - 56
    Cited by:  Papers (31)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (914 KB)

    An overview of some recent results for multi-h phase-coded modulation (MHPM) schemes is provided. These schemes offer power and bandwidth efficiency where time-varying modulation indices are used. Following a brief description of the structure of MHPM, its fundamental properties (e.g., minimum Euclidean distance and power spectra) are described. Decoding and demodulation of MHPM also are discussed... View full abstract»

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  • Spectral nulls and coding with large alphabets

    Publication Year: 1991, Page(s):58 - 67
    Cited by:  Papers (7)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (815 KB)

    Generalizations of the simple alternate mark inversion (AMI) line code that provide enhanced immunity to additive noise as well as spectral shaping are considered. The first technique is the extension of balanced disparity methods to multilevel signaling alphabets. This is a small step beyond simple codes such as AMI that are used to transmit binary PCM over twisted-pair cables. An important featu... View full abstract»

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  • Modulation and coding for information storage

    Publication Year: 1991, Page(s):68 - 86
    Cited by:  Papers (77)  |  Patents (68)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1673 KB)

    Many of the types of modulation codes designed for use in storage devices using magnetic recording are discussed. The codes are intended to minimize the negative effects of intersymbol interference. The channel model is first presented. The peak detection systems used in most commercial disk drives are described, as are the run length-limited (d,k) codes they use. Recently introduced recording cha... View full abstract»

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  • Implementation of coded modems

    Publication Year: 1991, Page(s):88 - 97
    Cited by:  Papers (7)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (926 KB)

    Modem implementation techniques that have been proposed to achieve good error probability (P/sub e/) performance in various channel environments and to allow miniaturization of trellis-coded modems are presented. The application of trellis-coded modems, coding and mapping, a quadrature modulator subsystem, and quadrature demodulator subsystem, including carrier-phase offset, carrier slip, automati... View full abstract»

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Huawei Technologies