| 摘要 |
An IQ-modulator pre-distorter includes an iteratively updated digital filter (gQ<SUB>0</SUB>, gQ<SUB>1</SUB>) for filtering one of the branches of an IQ-signal to compensate for IQ-modulator generated amplitude errors. An iteratively updated digital filter (cQI<SUB>0</SUB>, cQI<SUB>1</SUB>), 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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