Concatenated coded vestigial sideband modulation for high definition television
AssigneeAT&T Corp.
InventorLee-Fang Wei
Life of this patent
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Abstract
A modulation scheme for HDTV, for example, uses a concatenated code comprised of a Reed-Solomon coder followed by an N-dimensional trellis coder whose N-dimensional output symbols with N>1, are used to modulate a one-dimensional vestigial sideband modulator. Specifically, each N-dimensional symbol is a sequence of N one-dimensional signal points--specifically signal points of a one-dimensional VSB constellation.
Claims42
A method of transmitting a digital signal over a television channel, the method comprising the steps of
- Reed-Solomon encoding the digital signal,
- generating a sequence of N-dimensional symbols as a function of the Reed-Solomon-encoded signal using an N-dimensional trellis code, N>1,
- representing each of said symbols as a sequence of N one-dimensional signal points of a one-dimensional M-ary transmitter constellation,
- generating a vestigial sideband modulation signal which represents the resulting sequence of signal point representations, and
- applying said vestigial sideband modulation signal to said television channel.
Apparatus for transmitting a digital signal over a television channel, the apparatus comprising
- means for Reed-Solomon encoding the digital signal,
- means for generating a sequence of N-dimensional symbols as a function of the Reed-Solomon-encoded signal using an N-dimensional trellis code, N>1,
- means for representing each of said symbols as a sequence of N one-dimensional signal points of a one-dimensional M-ary transmitter constellation, and
- means for generating a vestigial sideband modulation signal which represents the resulting sequence of signal point representations and for applying said vestigial sideband modulation signal to said television channel.
A method of processing a television channel signal, said television channel signal having been generated by Reed-Solomon encoding a digital signal;
- generating a sequence of N-dimensional symbols as a function of the Reed-Solomon-encoded signal using an N-dimensional trellis code, N>1;
- representing each of said symbols as a sequence of N one-dimensional signal points of a one-dimensional M-ary transmitter constellation;
- generating a vestigial sideband modulation signal which represents the resulting sequence of signal point representations;
- and applying said vestigial sideband modulation signal to a television channel to produce said television channel signal;
- said method comprising the step of
- receiving said television channel signal from said television channel, and
- recovering said digital signal from said received television channel signal.
A method for processing a television channel signal, said television channel signal having been generated by Reed-Solomon encoding a digital signal;
- interleaving the Reed-Solomon-encoded signal;
- generating a sequence of N-dimensional symbols in response to the Reed-Solomon-encoded signal using an N-dimensional trellis code, N>1;
- representing each of said symbols as a sequence of N one-dimensional signal points of a one-dimensional M-ary transmitter constellation;
- generating a vestigial sideband modulation signal which represents the resulting sequence of signal point representations;
- and applying said vestigial sideband modulation signal to a television channel to produce said television channel signal;
- said method comprising the steps of
- receiving said television channel signal from said television channel,
- demodulating said television channel signal to generate a demodulated signal;
- Viterbi decoding said demodulated signal to recover said sequence of N-dimensional symbols,
- deinterleaving the recovered sequence of N-dimensional symbols, and
- Reed-Solomon decoding the deinterleaved symbols to recover said digital signal.
Apparatus for processing a television channel signal, said television channel signal having been generated by Reed-Solomon encoding a digital signal;
- generating a sequence of N-dimensional symbols as a function of the Reed-Solomon-encoded signal using an N-dimensional trellis code, N>1;
- representing each of said symbols as a sequence of N one-dimensional signal points of a one-dimensional M-ary transmitter constellation;
- generating a vestigial sideband modulation signal which represents the resulting sequence of signal point representations;
- and applying said vestigial sideband modulation signal to a television channel to produce said television channel signal;
- said apparatus comprising
- means for receiving said television channel signal from said television channel, and
- means for recovering said digital signal from said received television channel signal.
Apparatus for processing a television channel signal, said television channel signal having been generated by Reed-Solomon encoding a digital signal;
- interleaving the Reed-Solomon-encoded signal;
- generating a sequence of N-dimensional symbols in response to the Reed-Solomon-encoded signal using an N-dimensional trellis code, N>1;
- representing each of said symbols as a sequence of N one-dimensional signal points of a one-dimensional M-ary transmitter constellation;
- generating a vestigial sideband modulation signal which represents the resulting sequence of signal point representations;
- and applying said vestigial sideband modulation signal to a television channel to produce said television channel signal;
- said apparatus comprising
- means for receiving said television channel signal from said television channel,
- means for demodulating said television channel signal to generate a demodulated signal;
- means for Viterbi decoding said demodulated signal to recover said sequence of N-dimensional symbols,
- means for deinterleaving the recovered sequence of N-dimensional symbols, and
- means for Reed-Solomon decoding the deinterleaved symbols to recover said digital signal.
Dependencies are inferred from the claim text.