RF receiver having improved signal-to-noise ratio and method...

Details RF receiver having improved signal-to-noise ratio and method... RF receiver having improved signal-to-noise ratio and method...

2007-01-02

2007-01-02

Kim, Kevin (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

Reexamination Certificate

active

10761476

ABSTRACT:
There is disclosed, for use in a CDMA receiver, a noise reduction circuit for improving the signal-to-noise ratio of a received CDMA signal comprising a series of chip sequences. The noise reduction circuit comprises: 1) a sampling circuit for generating an original plurality of samples of the received signal; and 2) a controller for determining a first plurality of time slots containing chip samples equal to Logic 1, and a second plurality of time slots containing chip samples equal to Logic 0. The controller generates a reconstructed plurality of samples by at least one of: a) modifying an order of a first Logic 1 chip sample and a second Logic 1 chip sample; and b) modifying an order of a first Logic 0 chip sample and a second Logic 0 chip sample.

REFERENCES:
patent: 5768307 (1998-06-01), Schramm et al.
patent: 6373881 (2002-04-01), Mizuguchi et al.
patent: 6452377 (2002-09-01), Clark

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