Radio equipment
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United States of America Patent
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Apr 10, 2007
Grant Date -
Feb 12, 2004
app pub date -
Jul 30, 2003
filing date -
Aug 7, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Radio equipment including a characteristic compensator for compensating for an orthogonality error of a mixer with low consumption power is disclosed. In radio equipment, an orthogonal detector converts a received real signal into a complex reception signal of an intermediate frequency. Further, when a complex reception signal converted into a digital signal by A/D converters includes a desired signal (quasi-desired signal), which includes an image signal of a non-desired signal, and a non-desired signal (preparatory desired signal), which includes an image signal of a desired signal, a frequency of the quasi-desired signal is frequency-converted to a signal closer to a direct current component by a frequency converter and a frequency of the preparatory desired signal is frequency-converted to a signal closer to a direct current component by a frequency converter. A decimator respectively performs a filtering and a down-sampling on the frequency-converted quasi-desired signal and preparatory desired signal. A characteristic compensator 7 suppresses the image signal of the non-desired signal included in an inputted quasi-desired signal by means of a complex codomain signal of an inputted preparatory desired signal.
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Cited Art Landscape
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