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Method and apparatus for high-rate n/n+1 low-complexity modulation codes with adjustable codeword length and error control capability

  • US 6,018,304 A
  • Filed: 03/23/1998
  • Issued: 01/25/2000
  • Est. Priority Date: 12/18/1997
  • Status: Expired due to Term
First Claim
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1. A method for modulating a predefined number of bits of a binary data word Xn with a predetermined set of target constraints into codewords having a predefined number of code bits Cn+1 bits comprising the steps of:

  • a. pad the data word [Xn =x1 x2 . . . xn ] with zeros to the form [0 x1 x2 . . . xn 0],b. process the padded data word with 1⊕

    D to form the pre-encoded codeword C'"'"'n+1 such that all C'"'"'n+1 have even weight; and

    c. choose the pre-encoded codewords C'"'"'n+1 which violate a target constraint and invert in a decodable way an odd number of bits of the codeword to form the odd parity codeword Cn+1 which satisfies the target constraints.

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