Pulse or digital communications – Testing – Signal noise
Reexamination Certificate
2005-06-27
2008-11-18
Tran, Khanh C (Department: 2611)
Pulse or digital communications
Testing
Signal noise
C455S114200
Reexamination Certificate
active
07453934
ABSTRACT:
The present invention provides a method for automatic calibration of a signal path in receivers (e.g., radio frequency receivers) using a noise (and not a specific test signal) as a source and a fast Fourier transform (FFT) of the noise for correcting various parameters related to an inphase/quadrature (I/Q) imbalance in a frequency domain. The present invention (method and apparatus) can provide detecting and correcting an I/Q phase error, an I/Q amplitude error, an absolute corner frequency of the analog baseband filter, and a relative corner frequency of the analog baseband filters just by using the noise as a stimuli. This calibration can be used for a factory calibration or it can be used as an on-site calibration for base stations. Mobile devices can calibrate themselves independently of their location. This reduces the requirements for the test equipment in the manufacturing and maintenance stages.
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Gustafsson Mikael
Koskela Julius
Seppinen Pauli
Nokia Corporation
Tran Khanh C
Ware Fressola Van Der Sluys & Adolphson LLP
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