Methods and systems for LDPC coding

Details Methods and systems for LDPC coding Methods and systems for LDPC coding

2007-02-28

2010-12-28

Lamarre, Guy J (Department: 2112)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S786000, C714S790000

Reexamination Certificate

active

07861134

ABSTRACT:
Methods and systems of low density parity check coded (LDPCC) coding are disclosed herein in which a set of LDPC codes ensure reliable transmission for channels in which modulation symbols may undergo attenuation in a random fashion. Methods and systems of LDPC coding disclosed herein include choosing a code blocklength and concatenating codewords into which a data packet can be encoded. To optimize the coding scheme, first, codeword shortening is performed to ensure an integer number of codewords for a desired packet length. The codewords may then be punctured or repeated to ensure an integer number of channel symbols per codeword. Shortening and puncturing repetition methods are implemented to yield minimum overhead while keeping the effective coding rate low.

REFERENCES:
patent: 2006/0218459 (2006-09-01), Hedberg
patent: 2007/0041458 (2007-02-01), Hocevar et al.
patent: 2007/0143656 (2007-06-01), Niu et al.
International Search Report and Written Opinion, dated Jul. 22, 2008.
Baldi, Marco et al., “Variable Rate LDPC Codes for Wireless Applications” Software in Telecommunications and Computer Networks, 2006. Softcom 2006; Oct. 1, 2006, 5 pages.
Blahut, R.E., “Theory and Practice of Error Control Codes, Section 3.5 Perfect and Quasi-Perfect Codes,” 1983, Addison Wesley, pp. 56-58.
Supplementary European Search Report for EP Application 08730110.7, dated May 27, 2010.

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