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US 8,509,292 B2Granted
Receiver capable of compensating for mismatch of I signal and Q signal and communication system including the same
AssigneeSamsung Electronics Co., Ltd.
InventorsKyu Man Lee, Jin Yong Chung, Gi Bong Jeong
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Abstract
A receiver includes a frequency converter configured to generate a I signal and a Q signal from each band of a multiband signal and a mismatch compensator configured to estimate a mismatch of the I signal and the Q signal for each of the bands of the multiband signal and store at least one compensation value to compensate for the estimated mismatch. The frequency converter compensates for the mismatch of the I signal and the Q signal based on the at least one compensation value.
Claims19
A receiver comprising:
- a frequency converter configured to generate an in-phase (I) signal and a quadrature-phase (Q) signal from each band of a multiband signal;
- a mismatch compensator configured to estimate a mismatch between the I signal and the Q signal for each of the bands of the multiband signal and store at least one compensation value to compensate for the estimated mismatch;
- an analog-to-digital converter configured to perform analog-to-digital conversion on the I signal and the Q signal and to output a digital I signal and a digital Q signal;
- and
- a demodulator configured to receive the digital I signal and the digital Q signal and to perform demodulation on each of the digital I and Q signals to generate a corresponding demodulated digital I signal and a demodulated digital Q signal,
- wherein the frequency converter is further configured to compensate for the mismatch between the I signal and the Q signal based on the at least one compensation value, and
- wherein the demodulator comprises a fast Fourier transform (FFT) block configured to perform a FFT on the digital I signal mixed with one of the compensation values and to perform a FFT on the digital Q signal mixed with another one of the compensation values.
4 more elements
A receiver comprising:
- an antenna configured to receive a multiband signal having at least two distinct frequency bands;
- a low band pass filter configured to reject frequencies from at least one of the two distinct frequency bands to generate a band passed signal;
- a low-noise amplifier configured to amplify the band passed signal to generate an output signal;
- a voltage-controlled oscillator configured to generate a reference signal;
- a signal generator configured to generate an in-phase signal and a quadrature-phase signal in response to the reference signal;
- a first mixer configured to mix the output signal, the in-phase signal, and a first compensation value to generate a compensated in-phase signal;
- a second mixer configured to mix the output signal, the quadrature-phase signal, and a second compensation value to generate a compensated quadrature-phase signal;
- an analog to digital converter configured to generate a digital in-phase signal from the compensated in-phase signal and a digital quadrature-phase signal from the compensated quadrature-phase signal;
- a third mixer configured to mix the digital in-phase signal with a third compensation value to generate a compensated digital in-phase signal;
- a fourth mixer configured to mix the digital quadrature-phase signal with a fourth compensation value to generate a compensated digital quadrature-phase signal;
- logic to compute a Fast Fourier Transform (FFT) on the compensated digital in-phase signal and the compensated digital quadrature-phase signal to respectively generate a corresponding FFT digital in-phase signal and a FFT digital quadrature-phase signal;
- a fifth mixer configured to mix the FFT digital in-phase signal with the third compensation value to generate a compensated FFT digital in-phase signal;
- a sixth mixer configured to mix the FFT digital quadrature-phase signal with the fourth compensation value to generate a compensated FFT digital quadrature-phase signal;
- and
- a mismatch compensation unit configured to estimate a mismatch in magnitude and phase between the compensated digital in-phase signal and the compensated digital quadrature-phase signal and a mismatch in magnitude and phase between the compensated FFT digital in-phase signal and the compensated FFT digital quadrature-phase signal to generate all of the compensation values.
12 more elements
A communication system comprising:
- a receiver configured to compensate for a mismatch between an in-phase (I) signal and a quadrature-phase (Q) signal, the receiver comprising:
- an antenna configured to receive a multiband signal;
- a voltage-controlled oscillator configured to generate a reference signal that is distinct from the multiband signal;
- a signal generator configured to generate the I signal and the Q signal from the reference signal;
- a first mixer configured to mix the multiband signal, the I signal, and a first compensation value to generate a compensated I signal;
- a second mixer configured to mix the multiband signal, the Q signal, and a second compensation value to generate a compensated Q signal;
- and
- a mismatch compensation unit configured to output the compensation values corresponding to a band of the multiband signal.
5 more elements
Dependencies are inferred from the claim text.