Quadrature amplitude modulated data for standard bandwidth telev

Details Quadrature amplitude modulated data for standard bandwidth telev Quadrature amplitude modulated data for standard bandwidth telev

1994-01-18

1996-04-23

Coles, Sr., Edward L.

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

375264, 375261, 375298, 371 43, 348384, H04L 512, H04L 2736, G06F 1110, H04N 712

Patent

active

055110967

ABSTRACT:
An outer symbol error correcting code is concatenated with a punctured multidimensional trellis code to provide an optimal scheme for communicating digital television signals in a standard (e.g., approximately six MHz) bandwidth channel via a cable television network or the like. An input signal is encoded using an outer symbol error correcting code to produce successive blocks. Each block comprises N seven-bit coded symbols of which M represent information to be communicated and the remaining N-M coded symbols comprise error correcting information. M/N is either 120/126, 121/127 or 122/128. The blocks are interleaved, and may be supplemented with control symbols that include a synchronization pattern for M/N=121/127 or M/N=122/128. The interleaved blocks are convolutionally encoded using an inner trellis code having a punctured rate 4/5 (sixty-four QAM) or 3/4 (sixteen QAM). The output symbols are multilevel modulated for transmission over a communication path using, for example, sixteen or sixty-four QAM. The transmitted symbols are decoded using a trellis decoder, deinterleaved, and further decoded in an outer symbol error decoder concatenated with the inner trellis decoder.

REFERENCES:
patent: 5023889 (1991-06-01), Divsalar et al.
patent: 5233629 (1993-08-01), Paik et al.
patent: 5321725 (1994-06-01), Paik et al.
patent: 5363408 (1994-11-01), Paik et al.

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