Method and apparatus for varying lengths of low density party check codewords
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United States of America Patent
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Aug 28, 2007
Grant Date -
Jul 14, 2005
app pub date -
Mar 31, 2004
filing date -
Jan 12, 2004
priority date (Note) -
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Abstract
A method and apparatus for encoding/decoding information using low density parity check (LDPC) codewords of varying lengths. In one implementation, an encoder/decoder uses a parity check matrix having a size that corresponds to a length of information for each codeword. In one example, the size of the parity check matrix may be retrieved from multiple stored matrices having different sizes. In other examples, a mother code matrix may be dynamically adjusted by puncturing parity bits and/or deleting information bits. Other inventive embodiments and adaptations are also disclosed.
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