Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
2006-09-29
2009-08-04
Trinh, Sonny (Department: 2618)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S260000, C455S180300
Reexamination Certificate
active
07570965
ABSTRACT:
Aspects of a method and system for compensating for using a transmitter to calibrate a receiver for channel equalization are provided. Various embodiments of the invention may be applicable wireless devices in TDM systems, Bluetooth, and/or WLAN applications, for example. Transmit tones may be generated by a transmitter PLL and the baseband response may be measured for each of the injected tones. The tones may be swept over a frequency range and a corresponding oscillator signal may be mixed with the received signal to determine the response of, for example, the receiver filters. Adjusting any of a plurality of receiver and/or transmitter parameters based on baseband measurements may provide appropriate channel compensation or calibration. Accordingly, the baseband circuitry may generate equalization signals, which may be utilized to adjust receiver and/or transmitter circuitry. This approach may be provide I/Q balancing and transmit filtering calibration after receiver calibration is completed.
REFERENCES:
patent: 5844939 (1998-12-01), Scherer et al.
patent: 6803791 (2004-10-01), Park et al.
patent: 7164735 (2007-01-01), Gierl et al.
patent: 7257156 (2007-08-01), Lakkis
patent: 7403576 (2008-07-01), Lakkis
patent: 2004/0076228 (2004-04-01), Park et al.
Broadcom Corporation
McAndrews Held & Malloy Ltd.
Trinh Sonny
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