Reducing number of consecutive ones in data-dependent scrambler

Details Reducing number of consecutive ones in data-dependent scrambler Reducing number of consecutive ones in data-dependent scrambler

2005-05-24

2005-05-24

Tokar, Michael (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

To or from run length limited codes

C341S058000, C341S068000

Reexamination Certificate

active

06897792

ABSTRACT:
A data dependent scrambler (DDS) for a communications channel that transmits a user data sequence having a plurality of symbols includes a scrambler that generates a scrambled user data sequence that is based on the user data sequence and a seed. A first encoder selectively interleaves adjacent symbols in the scrambled user data sequence if an all-zero symbol is produced by bit interleaving. The first encoder identifies a pivot bit that is adjacent to the all-zero symbol if interleaving is performed and replaces the all-zero symbol with an all-one symbol if the pivot bit is zero.

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U.S. Appl. No. 10/639,796, filed Aug. 12, 2003.
U.S. Appl. No. 10/423,552, filed Apr. 25, 2003.

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