Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2005-02-24
2011-11-29
Tran, Khanh C (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
C375S295000, C375S297000, C375S298000, C375S299000, C455S063100, C455S067130, C455S101000, C455S114200, C455S118000, C455S126000, C330S149000
Reexamination Certificate
active
08068557
ABSTRACT:
An IQ-modulator pre-distorter includes an iteratively updated digital filter (gQ0, gQ1) for filtering one of the branches of an IQ-signal to compensate for IQ-modulator generated amplitude errors. An iteratively updated digital filter (cQI0, cQI1), cross-connected from one of the branches to the other branch, filters one of the components of an IQ-signal to compensate for IQ-modulator generated inter-modulation between the branches. Iteratively updated compensators (dcI, dcQ) counteract IQ-modulator generated offset errors.
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Hughes Eboni
Telefonaktiebolaget L M Ericsson (Publ)
Tran Khanh C
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