Radio receiver and radio receiving method
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Abstract
A radio receiver comprises an LNA which amplifies An RF signal, a quadrature demodulator which directly demodulates the amplified RF signal into a B/B signal, using a LO signal, a VGA which amplifies the B/B signal, a DC offset canceller which executes feedback control on the amplified B/B signal, and a gain controller which controls at least the gain of the LNA, the gain controller including a signal intensity detector which detects the intensity of the amplified B/B signal, a gain selector which selects a desired one of preset gains on the basis of the detected intensity, a timing controller which controls timing of switching to the selected desired gain, and a gain control signal generator which changes, in accordance with the controlled timing, the interval at which an LNA gain control signal is generated.
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Citations
12 Claims
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1-5. -5. (canceled)
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6. A radio receiver comprising:
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a low noise amplifier which amplifies a radio signal, a quadrature demodulator which demodulates the amplified radio signal into a baseband signal;
a variable gain amplifier which amplifies the baseband signal;
an executing unit configured to execute feedback of the amplified baseband signal; and
a gain controller which controls a gain of the low noise amplifier, the gain controller comprising, a signal intensity detector which detects an intensity of the amplified baseband signal, a gain selector which selects a preset gain from a plurality of preset gains which are set for the low noise amplifier, based on the detected intensity, a timing controller which controls timing of switching the gain of the low noise amplifier to the selected preset gain, and a gain control signal output unit configured to output a gain control signal which controls the gain of the low noise amplifier according to the selected preset gain at a time-interval according to the controlled timing;
wherein the timing controller comprises, a measurement unit configured to measure time when an intensity of a received signal crosses a threshold value, and calculate a time-interval elapsing from a previous adjacent time when the intensity of the received signal crossed a threshold value to the measured time, a comparator configured to compare the time-interval with a preset time-interval, and the gain control signal output unit outputting the gain control signal to the low noise amplifier if the time-interval is longer than the preset time-interval. - View Dependent Claims (7, 8, 9, 10)
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11. (canceled)
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12. A radio receiving method comprising:
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amplifying a radio signal using a low noise amplifier;
demodulating the amplified radio signal into a baseband signal;
amplifying the baseband signal;
executing feedback of the amplified baseband signal;
controlling a gain of the low noise amplifier;
detecting an intensity of the amplified baseband signal;
selecting a preset gain from a plurality of preset gains which are set for the low noise amplifier, based on the detected intensity;
controlling timing of switching the gain of the low noise amplifier to the selected preset gain; and
outputting a gain control signal which controls the gain of the low noise amplifier according to the selected preset gain at a time-interval according to the controlled timing;
wherein controlling the timing comprises, measuring time when an intensity of a received signal crosses a threshold value, and calculate a time-interval elapsing from a previous adjacent time when the intensity of the received signal crossed a threshold value to the measured time, comparing the time-interval with a preset time-interval, and outputting the gain control signal outputs the gain control signal to the low noise amplifier if the time-interval is longer than the preset time-interval.
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Specification