Transceiver with calibrated I and Q paths and methods for deconvolved calibration
First Claim
Patent Images
1. A method of reducing offsets of a transceiver comprising:
- measuring receiver amplitude and phase mismatches of receiver radio-frequency (RF) circuitry by performing a fast Fourier transform (FFT) on a receiver calibration signal;
applying receiver amplitude and phase offsets to substantially offset the receiver mismatches;
applying a transmitter calibration signal;
measuring transmitter amplitude and phase mismatches of transmitter RF circuitry by performing an FFT on the transmitter calibration signal; and
coupling a limiter between an output of the transmitter RF circuitry and an input of receiver RF circuitry, the limiter to generate a receiver-transmitter calibration signal based on an output RF signal of the transmitter RF circuitry, the receiver-transmitter calibration signal having a non-image component, an image component and a main component,wherein the transmitter amplitude and phase mismatches are measured by performing the FFT on the receiver-transmitter calibration signal based on the non-image component, the FFT to separate the image component, the non-image component and the main component.
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Abstract
Phase and amplitude offsets of a multicarrier transceiver may be reduced by measuring receiver amplitude and phase mismatches of receiver radio-frequency (RF) circuitry by performing a fast Fourier transform (FFT) on a receiver calibration signal.
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Citations
30 Claims
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1. A method of reducing offsets of a transceiver comprising:
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measuring receiver amplitude and phase mismatches of receiver radio-frequency (RF) circuitry by performing a fast Fourier transform (FFT) on a receiver calibration signal; applying receiver amplitude and phase offsets to substantially offset the receiver mismatches; applying a transmitter calibration signal; measuring transmitter amplitude and phase mismatches of transmitter RF circuitry by performing an FFT on the transmitter calibration signal; and coupling a limiter between an output of the transmitter RF circuitry and an input of receiver RF circuitry, the limiter to generate a receiver-transmitter calibration signal based on an output RF signal of the transmitter RF circuitry, the receiver-transmitter calibration signal having a non-image component, an image component and a main component, wherein the transmitter amplitude and phase mismatches are measured by performing the FFT on the receiver-transmitter calibration signal based on the non-image component, the FFT to separate the image component, the non-image component and the main component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 15)
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13. A method of reducing offsets of a transceiver comprising:
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measuring receiver amplitude and phase mismatches of receiver radio-frequency (RF) circuitry by performing a fast Fourier transform (FFT) on a receiver calibration signal; applying receiver amplitude and phase offsets to substantially offset the receiver mismatches; applying a transmitter calibration signal; measuring transmitter amplitude and phase mismatches of transmitter RF circuitry by performing an FFT on the transmitter calibration signal; and applying the transmitter calibration signal comprising a single tone complex sinusoid generated by a subcarrier modulator, and wherein the method further comprises injection locking a voltage controlled oscillator at an output of the transmitter RF circuitry with the transmitter calibration signal to generate a low-image signal at the output of the transmitter RF circuitry.
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14. A method of reducing offsets of a transceiver comprising:
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measuring receiver amplitude and phase mismatches of receiver radio-frequency (RF) circuitry by performing a fast Fourier transform (FFT) on a receiver calibration signal; applying receiver amplitude and phase offsets to substantially offset the receiver mismatches; applying a transmitter calibration signal; measuring transmitter amplitude and phase mismatches of transmitter RF circuitry by performing an FFT on the transmitter calibration signal; and prior to applying the transmitter calibration signal, coupling an output of transmitter RF circuitry to an input of the receiver RF circuitry, wherein the applying the receiver amplitude and phase offsets is performed concurrently with the applying the transmitter calibration signal to measure the transmitter amplitude and phase mismatches, wherein measuring the receiver amplitude and phase mismatches comprises measuring an image component of the receiver calibration signal produced by the receiver RF circuitry after performing an FFT on the receiver calibration signal at an output of the receiver RF circuitry, wherein measuring the transmitter amplitude and phase mismatches comprises measuring an image component of the transmitter calibration signal produced by the transmitter RF circuitry after performing an FFT on the transmitter calibration signal at the output of the receiver RF circuitry, wherein the method is performed by a first communication station, and wherein after generating both the transmitter and receiver amplitude and phase offsets, the method further comprises; applying the transmitter amplitude and phase offsets to a transmit signal comprising transmit frequency-domain signals before performing an IFFT on the transmit frequency-domain signals; RF modulating and transmitting the transmit signal to a second communication station; receiving and RF demodulating a received signal received from the second communication station; and applying the receiver amplitude and phase offsets to receive frequency-domain signals comprising the received signal after performing an FFT on the received signal.
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16. A transceiver comprising:
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calibration circuitry to measure receiver amplitude and phase mismatches of receiver RF circuitry from a fast Fourier transform (FFT) on a receiver calibration signal; and receiver offset correction circuitry to apply receiver amplitude and phase offsets to substantially offset the receiver mismatches, wherein the calibration circuitry measures transmitter amplitude and phase mismatches of transmiller RF circuitry from an FFT on a transmiller calibration signal, wherein the transceiver further comprises inverse FFT (IFFT) circuitry, FFT circuitry, and a limiter coupled between an output of the transmitter RF circuitry and an input of the receiver RF circuitry, the limiter to generate a receiver-transmitter calibration signal based on an output RF signal of the transmitter RF circuitry, the receiver-transmitter calibration signal having a non-image component, an image component and a main component, and wherein the calibration circuitry measures the transmitter amplitude and phase mismatches based on the non-image component after the FFT circuitry performs the FFT on the receiver-transmitter calibration signal to separate the image, non-image and main components. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A transceiver comprising:
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calibration circuitry to measure receiver amplitude and phase mismatches of receiver RF circuitry from a fast Fourier transform (FFT) on a receiver calibration signal; and receiver offset correction circuitry to apply receiver amplitude and phase offsets to substantially offset the receiver mismatches, wherein the calibration circuitry measures transmitter amplitude and phase mismatches of transmitter RF circuitry from an FFT on a transmitter calibration signal, wherein a calibration synthesizer applies the receiver calibration signal to an input of the receiver RF circuitry, wherein the receive calibration signal is applied either prior to or concurrently with the calibration circuitry to measure the receiver amplitude and phase mismatches, wherein the transmitter calibration signal comprises a single tone complex sinusoid generated by a subcarrier modulator, and wherein a voltage controlled oscillator is injection locked with signals at an output of the transmitter RF circuitry generated by the transmitter RF circuitry in response to the transmitter calibration signal, the voltage controlled oscillator to generate a low-image signal at the output of the transmitter RF circuitry.
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29. A transceiver comprising:
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calibration circuitry to measure receiver amplitude and phase mismatches of receiver RF circuitry from a fast Fourier transform (FFT) on a receiver calibration signal; and receiver offset correction circuitry to apply receiver amplitude and phase offsets to substantially offset the receiver mismatches, wherein the calibration circuitry measures transmitter amplitude and phase mismatches of transmitter RF circuitry from an FFT on a transmitter calibration signal, wherein the transmitter and receiver RF circuitry communicate multicarrier signals comprising a plurality of symbol-modulated subcarriers, and wherein the calibration circuitry measures the receiver and transmitter mismatches for at least one subcarrier of the plurality, and wherein the transmitter offset correction circuitry applies transmitter offsets and the receiver offset correction circuitry applies receiver offsets for the subcarriers of the plurality.
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30. A system comprising:
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a substantially onmidirectional antenna; a transceiver to communicate signals with the antenna, the transceiver comprising; calibration circuitry to measure receiver amplitude and phase mismatches of receiver radio-frequency (RF) circuitry from a fast Fourier transform (FFT) on a receiver calibration signal; and receiver offset correction circuitry to apply receiver amplitude and phase offsets to substantially offset the receiver mismatches, wherein the calibration circuitry measures transmitter amplitude and phase mismatches of transmiller RF circuitry from an FFT on a transmiller calibration signal, wherein the transceiver further comprises inverse FFT (IFFT) circuitry, FFT circuitry, and a limiter coupled between an output of the transmitter RF circuitry and an input of the receiver RF circuitry, the limiter to generate a receiver-transmitter calibration signal based on an output RF signal of the transmitter RF circuitry, the receiver-transmitter calibration signal having a non-image component, an image component and a main component, and wherein the calibration circuitry measures the transmitter amplitude and phase mismatches based on the non-image component after the FFT circuitry performs the FFT on the receiver-transmitter calibration signal to separate the image, non-image and main components.
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Specification