Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Reexamination Certificate
2008-06-27
2011-11-08
Jackson, Blane J (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
C455S137000
Reexamination Certificate
active
08055234
ABSTRACT:
Circuits and methods are disclosed for compensating for received signal distortion caused by non-linearities in the receiver circuitry. An exemplary receiver circuit includes a distortion waveform generator configured to approximate one or more non-linear response characteristics of a downconverter circuit used to downconvert the received radio frequency signal. The estimated distortion waveform thus produced is filtered, using a filter or filters substantially similar to those used for filtering an intermediate frequency signal that includes the desired signal and non-linear distortion products caused by strong interfering signals. The filtered estimated distortion waveform and the intermediate frequency are sampled, to obtain a sampled distortion signal and a sampled signal of interest. The sampled distortion signal is scaled, and subtracted from the sampled signal of interest to obtain reduced-interference signal samples. In some embodiments, the scaling factor is determined by correlating the sampled signal of interest with the sampled distortion signal.
REFERENCES:
patent: 4888557 (1989-12-01), Puckette, IV et al.
patent: 5241702 (1993-08-01), Dent
patent: 5568520 (1996-10-01), Lindquist et al.
patent: 5712637 (1998-01-01), Lindquist et al.
patent: 5749051 (1998-05-01), Dent
patent: 6370205 (2002-04-01), Lindoff et al.
patent: 6449320 (2002-09-01), Lindoff
patent: 6473471 (2002-10-01), Lindquist et al.
patent: 6606484 (2003-08-01), Faulkner
patent: 7046720 (2006-05-01), Lindoff et al.
patent: 7657241 (2010-02-01), Shah
patent: 7773967 (2010-08-01), Smith
patent: 2004/0048576 (2004-03-01), Hildebrand et al.
patent: 2005/0159124 (2005-07-01), Shah
patent: 2007/0184782 (2007-08-01), Sahota et al.
patent: 2009/0075610 (2009-03-01), Keehr et al.
patent: 2898746 (2007-09-01), None
Dent, P. W. et al. “Methods and Apparatus for Reducing Own-Transmitter Interference in Low-IF and Zero-IF Receivers.” Co-pending U.S. Appl. No. 12/163,248, filed Jun. 27, 2008.
Dent, P. W. et al. “Strong Signal Tolerant OFDM Receiver and Receiving Methods.” Co-pending U.S. Appl. No. 12/339,630, filed Dec. 19, 2008.
Dent, P. W. et al. “Own Transmitter Interference Tolerant Transceiver and Receiving Methods.” Co-pending U.S. Appl. No. 12/339,726, filed Dec. 19, 2008.
International Search Report for PCT Application No. PCT/EP2009/058054 mailed Feb. 24, 2010.
Dent Paul Wilkinson
Mattisson Sven
Coats & Bennett P.L.L.C.
Jackson Blane J
Telefonaktiebolaget LM Ericsson (publ)
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