Walsh-Hadamard decoder

Details Walsh-Hadamard decoder Walsh-Hadamard decoder

2006-02-07

2006-02-07

Phu, Phuong (Department: 2631)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S147000, C375S259000, C708S410000, C708S400000

Reexamination Certificate

active

06996163

ABSTRACT:
In one embodiment, a Walsh-Hadamard decoder can have a hardware efficient Fast Hadamard Transform (“FHT”) engine. In one embodiment, the FHT engine can include an input to receive an input sequence to be decoded into a Walsh-Hadamard codeword. The FHT engine can further include a controller to correlate the received input sequence with a plurality of Walsh-Hadamard codewords using two add/subtract modules. In one embodiment, the two add/subtract modules operate in parallel.

REFERENCES:
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patent: 5726925 (1998-03-01), Hyun et al.
patent: 5856935 (1999-01-01), Moy et al.
patent: 6028889 (2000-02-01), Gude et al.
patent: 6311202 (2001-10-01), Hahm
patent: 6732130 (2004-05-01), Shoji

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