Pulse or digital communications – Spread spectrum – Frequency hopping
Reexamination Certificate
2008-04-22
2008-04-22
Bayard, Emmanuel (Department: 2611)
Pulse or digital communications
Spread spectrum
Frequency hopping
C375S139000
Reexamination Certificate
active
10872950
ABSTRACT:
A noise reduction circuit for improving a signal-to-noise ratio of an input signal corresponding to a predetermined sequence of chips, each of the chips having a value corresponding to Logic 0 or Logic 1. The noise reduction circuit comprises a sampling circuit for generating a first sequence of samples of the input signal; a controller for identifying samples in the first sequence of samples corresponding to Logic 0 chips and Logic 1 chips; and a randomizing circuit. The randomizing circuit generates a second sequence of samples by at least one of: i) shifting-positions within the first sequence of samples of some of the identified Logic 0 samples; and ii) shifting positions within the first sequence of samples of some of the identified Logic 1 samples corresponding to Logic 1 chips. The first and second sequences of samples may then be combined to generate an improved composite signal.
REFERENCES:
patent: 5029180 (1991-07-01), Cowart
patent: 7158560 (2007-01-01), Cleveland
patent: 2004/0008759 (2004-01-01), Yang
patent: 2005/0249109 (2005-11-01), Cleveland
patent: 2005/0265274 (2005-12-01), Cleveland
Bayard Emmanuel
Samsung Electronics Co,. Ltd.
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