Mixer impairment correction based on volterra series

A non-transitory machine readable medium comprising instructions that, when executed, cause a machine to:

• receive an in-phase (I) component of a signal and a quadrature (Q) component of the signal;
• generate a mixer predistortion signal that compensates for nonlinearities introduced by a mixer that upconverts the signal;
• and
• receive at least one time-delayed I component of the signal and at least one time-delayed Q component of the signal,
• wherein the skew correction signal comprises a skew correction I component and a skew correction Q component that are each based on a linear combination of the signal I component, the signal Q component, the at least one time-delayed I component of the signal, and the at least one time-delayed Q component of the signal.

A system configured for use in a transmitter, comprising:

• mixer predistortion circuitry configured to receive an in-phase (I) component of a signal, a quadrature (Q) component of the signal, at least one time-delayed I component of the signal, and at least one time-delayed Q component of the signal, wherein the mixer predistortion circuitry is configured to generate a mixer predistortion signal based at least in part on the I and Q components, the at least one time-delayed I component, and the at least one time-delayed Q component, wherein the mixer predistortion signal compensates for nonlinearities and memory effects caused by a mixer that upconverts the signal;
• imbalance correction circuitry configured to receive the I and Q components of the signal and to generate an imbalance correction signal based at least in part on the I and Q components, wherein the imbalance correction signal compensates for a gain and phase imbalance caused by the mixer;
• skew correction circuitry configured to receive the I and Q components of the signal, the at least one time-delayed I component, and the at least one time-delayed Q component, wherein the skew correction circuitry is configured to generate a skew correction signal based at least in part on the I component, the Q component, the at least one time-delayed I component, and the at least one time-delayed Q component, wherein the skew correction signal compensates for a gain and phase skew caused by the mixer;
• and
• power amplifier (PA) predistortion circuitry configured to receive the I and Q components, the at least one time-delayed I component of the signal, and the at least one time-delayed Q component of the signal, and to generate a PA predistortion signal based at least in part on the I and Q components, the at least one time-delayed I component of the signal, and the at least one time-delayed Q component of the signal, wherein the PA predistortion signal compensates for nonlinearities and memory effects caused by a PA that amplifies the signal.

An apparatus configured for use in a transmitter, comprising:

• a mixer that up-converts a first signal into a radio-frequency (RF) output signal, wherein the mixer introduces nonlinearities into the RF output signal;
• mixer predistortion circuitry configured to receive the first signal having signal in-phase (I) and signal quadrature (Q) components and configured to generate a mixer predistortion signal that compensates for at least some of the nonlinearities introduced by the mixer, wherein the mixer predistortion circuitry is further configured to generate the mixer predistortion signal based at least in part on the signal I and Q components of the first signal;
• and
• skew correction circuitry configured to receive the signal I and Q components of the signal and to generate a skew correction signal based at least in part on the signal I and Q components, wherein the skew correction signal compensates for a gain and phase skew caused by the mixer,
• wherein the skew correction circuitry is additionally configured to receive at least one time-delayed signal I component and at least one time-delayed signal Q component, wherein the skew correction signal is based at least in part on the at least one time-delayed signal I component and the at least one time-delayed signal Q component, and
• wherein the skew correction signal comprises a skew correction I component and a skew correction Q component, wherein each of the skew correction I component and the skew correction Q component are linear combinations of the signal I component, the signal Q component, the at least one time-delayed signal I component, and the at least one time-delayed signal Q component.