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US 8,478,222 B2Granted
I/Q calibration for walking-IF architectures
AssigneeQUALCOMM Incorporated
InventorsKlaas Wortel, Rainer Gaethke, Vincent K. Jones, James Gardner
Life of this patent
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Abstract
Systems and methodologies are described that facilitate calibration techniques for a station in a wireless communication system that can be utilized to provide joint estimates for distortion introduced by in-phase and quadrature (I/Q) imbalance and mixing-product modulated images.
Claims29
A method, comprising:
- summing an in-phase (I) IF signal with a quadrature (Q) IF signal in a transmitter to generate a summed signal, wherein the transmitter comprises at least one IF stage;
- mixing an RF local oscillator signal with the summed signal to generate an RF signal, wherein the RF signal has mixing-product modulated image components in a frequency band;
- detecting at least one parameter of the RF signal;
- and
- using at least the detected parameter, adjust at least one digital to analog converter (DAC) to reduce effects of both I/Q imbalance and the mixing-product modulated image components.
2 more elements
A device that performs modulation for wireless communications, comprising:
- a component that sums an in-phase (I) IF signal with a quadrature (Q) IF signal in a transmitter to generate a summed signal, wherein the transmitter comprises at least one IF stage;
- a component that mixes an RF local oscillator signal with the summed signal to generate an RF signal, wherein the RF signal has mixing-product modulated image components in a frequency band;
- a component that detects at least one parameter of the RF signal;
- and
- a component that uses the detected parameter to adjust at least one digital to analog converter (DAC) to reduce effects of both I/Q imbalance and the mixing-product modulated image components.
2 more elements
An apparatus that performs modulation for wireless communications, comprising:
- means for summing an in-phase (I) IF signal with a quadrature (Q) IF signal in a transmitter to generate a summed signal, wherein the transmitter comprises at least one IF stage;
- means for mixing an RF local oscillator signal with the summed signal to generate an RF signal, wherein the RF signal has mixing-product modulated image components in a frequency band;
- means for detecting at least one parameter of the RF signal;
- and
- means for adjusting at least one digital to analog converter (DAC), based on the detected parameter, to reduce effects of both I/Q imbalance and the mixing-product modulated image components.
2 more elements
A computer-program product for performing modulation for wireless communications, the computer-program product comprising a computer readable medium having instructions thereon, the instructions comprising:
- code for detecting at least one parameter of an RF signal generated by summing an in-phase (I) IF signal with a quadrature (Q) IF signal in a transmitter to generate a summed signal, wherein the transmitter comprises at least one IF stage, and mixing an RF local oscillator signal with the summed signal to generate an RF signal, wherein the RF signal has mixing-product modulated image components in a frequency band;
- and
- code for adjusting at least one digital to analog converter (DAC), based on the detected at least one parameter of the RF signal, to reduce effects of both I/Q imbalance and the mixing-product modulated image components.
A method, comprising:
- selecting known in-phase (I) and quadrature (Q) IF signals in a transmitter to be transmitted in a known frequency band, wherein the transmitter comprises at least one IF stage;
- summing the I IF signal with the Q IF signal to generate a summed IF signal;
- mixing an RF local oscillator signal with the summed IF signal to generate an RF signal, wherein the RF signal has mixing-product modulated image components in the known frequency band;
- and
- using a detected average power of the RF signal, adjust at least one digital to analog converter (DAC) to reduce effects of the mixing-product modulated image components.
2 more elements
A system, comprising:
- means for selecting known in-phase (I) and quadrature (Q) IF signals in a transmitter to be transmitted in a known frequency band, wherein the transmitter comprises at least one IF stage;
- means for summing the I IF signal with the Q IF signal to generate a summed IF signal;
- means for mixing an RF local oscillator signal with the summed IF signal to generate an RF signal, wherein the RF signal has mixing-product modulated image components in the known frequency band;
- and
- means for adjusting at least one digital to analog converter (DAC), based on a detected average power of the RF signal, to reduce effects of the mixing-product modulated image components.
2 more elements
Dependencies are inferred from the claim text.