Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Reexamination Certificate
2007-02-06
2007-02-06
Vuong, Quochien B. (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
C455S303000, C455S313000
Reexamination Certificate
active
10653300
ABSTRACT:
A method for I/Q mismatch calibration of a receiver having an I/Q correction module with correction parameters, comprising the steps of generating a test signal containing a single tone waveform with frequency of a carrier frequency plus a predetermined frequency, applying I/Q demodulation to reduce the central frequency of the test signal and outputting a demodulated signal, converting the demodulated signal to a digital signal, obtaining measures of the digital signal respectively indicative of the frequency response of the digital signal at the plus and minus predetermined frequencies, and calculating the set of the correction parameters for the I/Q correction module based on the measures.
REFERENCES:
patent: 5949821 (1999-09-01), Emami et al.
patent: 6122325 (2000-09-01), Mogre et al.
patent: 6330290 (2001-12-01), Glas
patent: 2003/0095589 (2003-05-01), Jeong
patent: 2005/0026577 (2005-02-01), Chiu
Cheng Jui-Hsi
Chiu Mao-Ching
Wu Kuo-Ming
Hannon Christian A.
Mediatek Inc.
Thomas Kayden Horstemeyer & Risley
Vuong Quochien B.
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