Method and apparatus for generating families of code signals usi

Details Method and apparatus for generating families of code signals usi Method and apparatus for generating families of code signals usi

1999-01-13

2000-09-26

Malzahn, David H.

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

G06F 758

Patent

active

061253782

ABSTRACT:
A multi-scale shuffle is used in the generation of orthogonal and pseudo-orthogonal codes. A method for generating a family of pseudo-random orthogonal or pseudo-orthogonal code signals, comprises the steps of (1) generating a seed matrix of original dimensions, (2) performing a plurality of expansions on the seed matrix, each successive expansion producing a next generation matrix of larger dimensions, the last of the expansions including replication and shuffling of a parent generation matrix to produce a child generation matrix, and (3) output row of the final matrix as the family code signals. The shuffling may comprise a pseudo-random re-ordering of matrix column indices. The replication and shuffling may comprise forming a child generation matrix by operations that include combining a reproduction of the parent matrix and a shuffled reproduction of the parent matrix. The replication and shuffling also may comprise forming an intermediate matrix by operations that include combining a reproduction of the parent matrix, a modified reproduction of the parent matrix, a shuffled reproduction of the parent matrix, and a modified shuffled reproduction of the parent matrix, and then shuffling the intermediate matrix to form the child matrix.

REFERENCES:
patent: 5327365 (1994-07-01), Fujisaki et al.
patent: 5515307 (1996-05-01), Aiello
patent: 5541996 (1996-07-01), Ridenour
patent: 5727063 (1998-03-01), Aiello et al.
patent: 5796776 (1998-08-01), Lomp et al.

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