Carrier leakage correction method for quadrature modulator
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorsYousuke Hagiwara, Shigehito Saigusa, Mitsuyuki Ashida, Yuki Fujimura, Ichiro Seto
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Abstract
A carrier leakage correction method for a quadrature modulator according to an embodiment includes inputting a test signal with a frequency fBB to a transmitter and up-converting the test signal with a frequency fL0 and down-converting with the frequency fL0. A frequency 2fBB component is detected in the down-converted test signal. One or a plurality of parameters of the transmitter is/are adjusted so as to reduce a magnitude of the detected frequency 2fBB component in the test signal.
Claims11
A radio communication apparatus comprising:
- a carrier leakage correction circuit configured to correct a carrier leakage of a test signal of a first frequency, based on one or more correction parameters;
- a quadrature modulator configured to up-convert the test signal with a second frequency;
- a quadrature demodulator configured to down-convert the up-converted test signal with the second frequency;
- and
- a carrier leakage correction control circuit configured to detect a frequency component twice the first frequency from the down-converted test signal, and adjust the one or more correction parameters to be given to the carrier leakage correction circuit so as to reduce a magnitude of the detected frequency component twice the first frequency.
Dependencies are inferred from the claim text.