Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Reexamination Certificate
2005-06-02
2009-02-24
Urban, Edward (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
C455S063100, C455S278100, C375S254000, C375S231000, C375S346000
Reexamination Certificate
active
07496340
ABSTRACT:
A system and method are provided for calibrating for an I/Q mismatch of a direct conversion receiver based on a random signal having a two-dimensional I versus Q trajectory, such as radio frequency (RF) noise. In general, the random signal is received and downconverted to a quadrature baseband signal having an in-phase component and a quadrature component. The variance of the in-phase component, the variance of the quadrature component, and the covariance of the in-phase component with the quadrature component are computed based on samples of the quadrature baseband signal. A correction matrix used to compensate for the I/Q mismatch of the receiver and/or I/Q mismatch including a gain mismatch and a phase mismatch of the receiver is then computed based on the variance of the in-phase component, the variance of the quadrature component, and the covariance of the in-phase component with the quadrature component.
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Chen Jesse E.
Cnudde Peter
Hanson Peter
Thoen Steven
Vandenameele Patrick
Chow Charles
RF Micro Devices, Inc.
Urban Edward
Withrow & Terranova, P.L.L.C.
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