| 摘要 |
According to one embodiment, a radio receiver includes an antenna, a low-noise amplifier (LNA), a quadrature demodulator, an analog-to-digital converter (ADC), first and second power calculators, a correlation value calculator, a correction parameter generator, a corrector, a demodulator, and a controller. The antenna receives a signal. The LNA amplifies the received signal. The quadrature demodulator demodulates the amplified signal. The ADC converts analog IQ into digital IQ. The first and second power calculators calculate the first and second powers, respectively. The correlation value calculator calculates a correlation value between the digital IQ. The correction parameter generator generates a correction parameter based on the first and second power expected values, and the correlation value between the digital IQ. The corrector performs a linear transform operation. The demodulator demodulates the corrected IQ. The controller generates a gain control signal. The LNA is operated on the basis of the gain control signal. |
| 主权项 |
1. A radio receiver comprising:
an antenna configured to receive a radio signal; a low-noise amplifier configured to amplify an output signal of the antenna with a low noise; a quadrature demodulator configured to demodulate an output signal of the low-noise amplifier, and to generate an analog I signal of an in-phase component and an analog Q signal of a quadrature component; a first analog-to-digital converter (ADC) configured to convert the analog I signal into a digital I signal of the in-phase component; a second analog-to-digital converter (ADC) configured to convert the analog Q signal into a digital Q signal of the quadrature component; a first power calculator configured to calculate a first power expected value of the digital I signal; a second power calculator configured to calculate a second power expected value of the digital Q signal; a correlation value calculator configured to calculate a correlation value between the digital I signal and the digital Q signal; a correction parameter generator configured to generate a correction parameter based on the first power expected value, the second power expected value, and the correlation value between the digital I signal and the digital Q signal; a corrector configured to perform a linear transform operation using the correction parameter, to correct an IQ imbalance of the digital I signal and the digital Q signal, and to generate a corrected I signal and a corrected Q signal; a demodulator configured to demodulate the corrected I signal and the corrected Q signal, and to generate a demodulated signal; and a controller configured to generate a gain control signal in order to control a gain of the low-noise amplifier in such a manner that a thermal noise mixed by the low-noise amplifier is larger than a quadrature demodulation noise mixed by the quadrature demodulator and an analog-digital conversion noise mixed by the analog-to-digital converters, wherein the low-noise amplifier is operated on the basis of the gain control signal. |
