发明名称 |
Method and apparatus for communicating multilevel modulated data using concatenated coding |
摘要 |
<p>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 (10) is encoded using an outer symbol error correcting code (12) 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 (18), and may be supplemented with control symbols (19) 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 (20) having a punctured rate 4/5 (sixty-four QAM) or 3/4 (sixteen QAM). The output symbols are multilevel modulated (21) for transmission over a communication path (26) using, for example, sixteen or sixty-four QAM. The transmitted symbols are decoded using a trellis decoder (32), deinterleaved (34), and further decoded in an outer symbol error decoder (36) concatenated with the inner trellis decoder (32). <IMAGE></p> |
申请公布号 |
EP0663775(B1) |
申请公布日期 |
2001.04.18 |
申请号 |
EP19950100463 |
申请日期 |
1995.01.14 |
申请人 |
GENERAL INSTRUMENT CORPORATION |
发明人 |
HUANG, ZHENG;HEEGARD, CHRIS |
分类号 |
H03M13/00;H03M13/29;H04L1/00;H04L27/00;H04L27/34;H04L27/38;H04N7/015;H04N7/24;H04N7/66;H04N19/00;H04N21/2383;H04N21/438;(IPC1-7):H04N7/24 |
主分类号 |
H03M13/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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