Pulse or digital communications – Receivers
Reexamination Certificate
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.
Gibson Timothy
Hunter Jeffrey Kent
Ahn Sam K
Fogg & Powers LLC
Honeywell International , Inc.
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