Comtech Telecommunications Corp.

Peter Sean Ladow

Eric John Hewitt

Alan Robert Danielson

Tom Hansen

Bradley William Lindstrom

A method and apparatus for decoding a linear block encoded string of information bits comprising: converting the string into a plurality of codewords. Performing hard and soft decisions on each codeword to generate a hard and soft decision vector. Computing the syndrome and finding the location of the two minimum values by Galois Field Arithmetic. Designating these values LOW1 and LOW2 and xoring with a Nc1, thus generating Nc2. Swapping Nc1 with Nc2 and determining the lowest soft decision value, Min1 and a next lowest value, Min2. The two bit locations creating Min1 are designated as MinA and MinB. MinA being replaced with Min2 minus the value MinA. MinB being replaced with Min2 minus the value at MinB. Generating an output codeword by subtracting Min1 from all other bit locations values and 2's complementing all soft values with 0 in their location. Creating the new soft value vector.

Enhanced turbo product code decoder system

A hyper encoder module encodes a block of data having a plurality of sub-blocks. Each sub-block includes a plurality of systematic block code codewords. A parity sub-block is added to the block. The parity sub-block is a first sub-block rotated by a predetermined number of bits. Each subsequent sub-block in the n-dimensional block is rotated by an appropriate number of bits and bit-wise XORed. An encoder method and apparatus which includes the hyper encoder module receives the block of data. A row of the block is immediately output and encoded by a first module according to a first encoding scheme. A column is encoded by a second module according to a second encoding scheme. A second set of encoded data is generated, iteratively updated and output by the second module. The hyper encoder module hyper-diagonally encodes the information bits as described above and then output.

Enhanced turbo product codes

A method and apparatus for decoding a linear block encoded string of information bits comprising: converting the string into a plurality of codewords. Performing hard and soft decisions on each codeword to generate a hard and soft decision vector. Computing the syndrome and finding the location of the two minimum values by Galois Field Arithmetic. Designating these values LOWand LOWand xoring with a Nc, thus generating Nc. Swapping Ncwith Ncand determining the lowest soft decision value, Minand a next lowest value, Min. The two bit locations creating Minare designated as MinA and MinB. MinA being replaced with Minminus the value MinA. MinB being replaced with Minminus the value at MinB. Generating an output codeword by subtracting Minfrom all other bit locations values and 2's complementing all soft values with 0 in their location. Creating the new soft value vector.

A method and apparatus for decoding a linear block encoded string of information bits comprising: converting the string into a plurality of codewords. Performing hard and soft decisions on each codeword to generate a hard and soft decision vector. Computing the syndrome and finding the location of the two minimum values by Galois Field Arithmetic. Designating these values LOWand LOWand xoring with a Ncthus generating NcSwapping Ncwith Ncand determining the lowest soft decision value, Minand a next lowest value, MinThe two bit locations creating Minare designated as MinA and MinB. MinA being replaced with Minminus the value MinA. MinB being replaced with Minminus the value at MinB. Generating an output codeword by subtracting Minfrom all other bit locations values and 2's complementing all soft values with 0 in their location. Creating the new soft value vector. Some embodiments include a system and method that organizes an encoded codeword. The encoded codeword has several codeword bits. The method receives the encoded codeword, assigns multiple codeword bits to at least one memory address in a plurality of memory addresses, and iteratively decodes the received codeword by utilizing the plurality of memory addresses in a predetermined order. The predetermined order is based on a dimension of the received codeword.

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Redmond, WA, United States of America

Peter Sean Ladow