Pulse or digital communications – Testing
Reexamination Certificate
2007-08-15
2010-12-21
Corrielus, Jean B (Department: 2611)
Pulse or digital communications
Testing
C375S285000, C375S296000, C375S346000, C375S344000, C455S067140, C455S115200, C455S226100
Reexamination Certificate
active
07856050
ABSTRACT:
A receiver, which is adapted for demodulating signal carriers at variable frequencies to provide received signals at a plurality of different received frequencies, is calibrated to compensate for a frequency-dependent imbalance in the amplitude and/or the quadrature phase of analog in-phase (I) and quadrature (Q) received-signal components that have passed through receiver circuit paths that may cause such imbalance. I-channel and Q-channel Rx-correction coefficients for each of a plurality of different calibration frequencies are estimated and stored in a lookup table. Rx-correction coefficients for a calibration frequency or frequencies that are the same as or closest to the received frequency or frequencies are accessed from the lookup table and combined with digital I and Q components of received signals that have been provided by analog-to-digital conversion of analog I and Q components of received signals that have passed through the imbalance-causing receiver circuit paths upon demodulation at the received frequency.
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Ren Yuhui Marie
Wiss John Robert
Callan Edward W.
Corrielus Jean B
L-3 Communications Titan Corporation
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