Methods and apparatus for decoding data
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United States of America Patent
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Nov 26, 2002
Grant Date -
N/A
app pub date -
Dec 16, 1998
filing date -
Dec 17, 1997
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Abstract
In a coded orthogonal frequency division multiplex (COFDM) system n-bit data words are encoded as 2.sup.m -symbol code words, each symbol having 2.sup.j possible values (e.g. j=3 for octary). An efficient decoder for these code words is provided by applying j iterations of the fast Hadamard transform, the input vector for the second and subsequent iterations being derived from the result of the immediately preceding iteration.
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