H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 7/015 (2006.01) H03M 13/29 (2006.01) H04L 1/00 (2006.01) H04L 27/34 (2006.01) H04L 27/38 (2006.01) H04N 7/66 (2006.01) H04N 7/24 (2006.01)
Patent
CA 2140484
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.
Heegard Chris
Huang Zheng
Ridout & Maybee Llp
Vizio
LandOfFree
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