Method and system for I/Q mismatch calibration and compensation for wideband communication receivers

摘要

Methods and systems for I/Q mismatch calibration and compensation for wideband communication receivers may include receiving a radio frequency (RF) signal in a receiver of a communication device, down-sampling the received RF signal to generate a channel k and its image channel −k at baseband frequencies, and determining average in-phase (I) and quadrature (Q) gain and phase mismatch of the channel k and the image channel −k. A curvature of gain mismatch for the channel k and the image channel −k may be estimate utilizing a blind source separation (BSS) estimation algorithm. The average I and Q gain and phase mismatch of the channel k and the image channel −k may be removed. A residual phase tilt and a residual amplitude tilt of the channel k and the image channel −k (with removed average I and Q gain and phase mismatch) may be determined.

主权项

1. A method for wireless communication, the method comprising:
in a communication device:
receiving a radio frequency (RF) signal in a receiver of said communication device;down-sampling said received RF signal to generate a channel k and its image channel −k at baseband frequencies;determining average in-phase (I) and quadrature (Q) gain and phase mismatch of said channel k and said image channel −k;determining a curvature of gain mismatch for said channel k and said image channel −k utilizing a blind source separation (BSS) estimation algorithm;removing said average I and Q gain and phase mismatch of said channel k and said image channel −k;determining, after said removing of said average I and Q gain and phase mismatch, a residual phase tilt and a residual amplitude tilt of said channel k and said image channel −k; andcompensating for said determined residual phase tilt and said determined residual amplitude tilt of said channel k and said image channel −k,wherein compensating for said determined residual phase tilt comprises passing a signal through a phase tilt correction filter, and wherein said signal comprises a sum of said channel k and said image channel −k shifted in frequency based on said determined curvature of said gain mismatch.