Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Reexamination Certificate
2006-12-05
2006-12-05
Vo, Nguyen T. (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
C455S226100, C375S349000
Reexamination Certificate
active
07146146
ABSTRACT:
An improved calibration system for a receiver is configured to calibrate the I and Q paths to correct for gain mismatch and quadrature phase errors. In a preferred embodiment, the calibration system calibrates the I and Q paths by using a calibration signal and a reference signal coherently generated from the same single frequency source. The calibration signal is input into the receiver and propagated along the I and Q paths of the receiver simultaneously with a received signal. The reference signal coherently extracts the calibration signal from the I and Q paths. The resulting calibration signals include a component at zero frequency that can be used to measure the phase and gain error. The calibration system is configured to adaptively calibrate the gain and phase error by iteratively measuring the gain and phase error and reducing it to the desired level or eliminating it altogether.
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Dell-Imagine Robert A.
Escobedo Peggy L.
Fountain Erik C.
Masenten Wesley K.
Shih Chinghsiu
DiTrans IP, Inc.
Haroon Adeel
Orrick Herrington & Sutcliffe LLP
Vo Nguyen T.
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