Radio equipment

Details Radio equipment Radio equipment

2007-04-10

2007-04-10

Urban, Edward F. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S296000, C375S346000

Reexamination Certificate

active

10630190

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 compensator7suppresses 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.

REFERENCES:
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patent: 2003/0165203 (2003-09-01), Mohindra
patent: 2003/0206603 (2003-11-01), Husted
patent: 2004/0156450 (2004-08-01), Auranen et al.
patent: 10-56484 (1998-02-01), None

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