Method for discerning a desired signal from an interfering...

Details Method for discerning a desired signal from an interfering... Method for discerning a desired signal from an interfering...

2008-04-23

2011-11-15

Ahn, Sam K (Department: 2611)

Pulse or digital communications

Receivers

Reexamination Certificate

active

08059755

ABSTRACT:
Described herein are methods and apparatuses for receiving a desired signal at a signal receiver with an undersampling frequency. A signal converter with a local oscillator frequency, a bandpass filter, and an analog-to-digital converter are used to generate an aliased discrete-time spectrum from an input analog spectrum. In order to determine the presence of interfering signals in the aliased discrete-time spectrum and, if present, separate a desired signal from the interfering signal, the local oscillator frequency is shifted. The original discrete-time spectrum and the resulting shifted discrete-time spectrum are both analyzed to select a local oscillator frequency that does not cause interference with the desired signal when the discrete-time spectrum is generated. The selected local oscillator frequency is then utilized to process the desired signal.

REFERENCES:
patent: 6111911 (2000-08-01), Sanderford et al.
patent: 2003/0171100 (2003-09-01), Petersson et al.
patent: 2006/0239389 (2006-10-01), Coumou
patent: 2007/0086544 (2007-04-01), Fudge et al.

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