Source coded modulation system

Details Source coded modulation system Source coded modulation system

1984-02-06

1986-04-29

Atkinson, Charles E.

Excavating

371 43, 375 25, H04L 512, G06F 1110

Patent

active

045861820

ABSTRACT:
Apparatus for sending bits of information over a band-limited channel by modulating a carrier in accordance with a sequence of signal points drawn from a constellation of available signal points, in which the apparatus includes circuitry for accumulating groups of the information bits for encoding into the signal points, different groups having different numbers of information bits from a primary data source, and an encoder for encoding at least the bits of each said group into at least one signal point drawn from the constellation, the encoder being arranged to draw different available signal points with different probabilities.

REFERENCES:
patent: 4077021 (1978-02-01), Csajka et al.
patent: 4483012 (1984-11-01), Wei
patent: 4493082 (1985-01-01), Cumberton
patent: 4520490 (1985-05-01), Wei
Ungerboeck, "Channel Coding with Multilevel/Phase Signals", IEEE Transactions of Information Theory, vol. IT-28, No. 1, Jan. 1982, pp. 55-67.

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