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Combining signals with a shuffled-hadamard function

  • US 8,374,218 B2
  • Filed: 06/09/2009
  • Issued: 02/12/2013
  • Est. Priority Date: 12/05/2000
  • Status: Active Grant
First Claim
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1. A computer-implemented method, comprising:

  • receiving, at a transmitter, during a symbol time that comprises a plurality of chip times, a data value for each of a plurality of distinct data channel inputs;

    for each of the plurality of chip times in the symbol time;

    (a) indexing a different row of a matrix of data bits, the matrix of data bits having a plurality of rows and a plurality of columns, wherein the matrix of data bits comprises a first matrix that corresponds to a Hadamard matrix whose rows have been randomly or pseudo-randomly shuffled;

    (b) decoding one channel from the plurality of distinct data channel inputs using a first subset of one or more columns of the indexed row;

    (c) determining a code value for the decoded one channel from a plurality of possible code values that are derived from a second subset that is different than the first subset, the second subset comprising of one or more columns of the indexed row; and

    (d) providing the coded data value to a transmission circuit for transmission to a receiver.

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