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.
Claims28
A method, comprising:
- summing an in-phase (I) IF signal with a quadrature (Q) IF signal to generate a summed signal;
- 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 of the I and Q IF signals to reduce effects of both I/Q imbalance and the mixing-product modulated image components.
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 to generate a summed signal;
- 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 of the I and Q IF signals to reduce effects of both I/Q imbalance and the mixing-product modulated image components.
An apparatus that performs modulation for wireless communications, comprising:
- means for summing an in-phase (I) IF signal with a quadrature (Q) IF signal to generate a summed signal;
- 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 of the I and Q IF signals, based on the detected parameter, to reduce effects of both I/Q imbalance and the mixing-product modulated image components.
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 to generate a summed signal 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 of the I and Q IF signals, 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 to be transmitted in a known frequency band;
- 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 of the I and Q IF signals to reduce effects of the mixing-product modulated image components.
A system, comprising:
- means for selecting known in-phase (I) and quadrature (Q) IF signals to be transmitted in a known frequency band;
- 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 using a detected average power of the RF signal, adjust at least one of the I and Q IF signals to reduce effects of the mixing-product modulated image components.
Dependencies are inferred from the claim text.