Variable modulation with LDPC (low density parity check) coding

Details Variable modulation with LDPC (low density parity check) coding Variable modulation with LDPC (low density parity check) coding

2011-07-05

2011-07-05

Lamarre, Guy J (Department: 2112)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S786000, C714S774000, C714S790000

Reexamination Certificate

active

07975202

ABSTRACT:
Variable modulation with LDPC (Low Density Parity Check) coding provides for generation of LDPC coded symbols having different respective code rates and/or modulations. In addition, appropriate LDPC encoding, that generates an LDPC variable code rate signal, may also be performed as well. The encoding can generate an LDPC variable code rate and/or modulation signal whose code rate and/or modulation may vary as frequently as on a symbol by symbol basis. Some embodiments employ a common constellation shape for all of the symbols of the signal sequence, yet individual symbols may be mapped according different mappings of the commonly shaped constellation; such an embodiment may be viewed as generating a LDPC variable mapped signal. In general, any one or more of the code rate, constellation shape, and/or mapping of the individual symbols of a signal sequence may vary as frequently as on a symbol by symbol basis.

REFERENCES:
patent: 5534828 (1996-07-01), Okada et al.
patent: 5949796 (1999-09-01), Kumar
patent: 7139964 (2006-11-01), Shen et al.
patent: 2004/0240590 (2004-12-01), Cameron et al.

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