Construction of multi rate low density parity check convolutional codes
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United States of America Patent
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Nov 25, 2014
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app pub date -
Aug 24, 2012
filing date -
Aug 24, 2011
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Abstract
A device for encoding a sequence of information bits includes an LDPC-CC encoder to generate a first part of a codeword from a sequence of information bits and a set of programmable accumulators coupled to the LDPC-CC encoder to generate a second part of the codeword. The second part of the codeword is combined with the first part of the codeword to generate the codeword. The code rate of the codeword is varied by the number of accumulators being enabled to connect to the encoder. A puncturing unit is coupled to the output of the encoder for shortening the length of the first part of the codeword. A rate matching unit is coupled to the output of the encoder, to the output of the puncturing unit and to the output of the set of programmable accumulator to further adjust the code rate of the codeword.
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