Quadrature receiver mismatch calibration

This correspondence introduces nonlinear regression techniques to estimate gain and phase mismatches between the in-phase(1) and quadrature (Q) branch es of a quadrature receiver. Under modest assumptions, the system intrinsic ally follows a nonlinear regression model. The algorithm is effective, easi ly implemented, customizable, and requires few assumptions. Large-sample, j ackknife, and bootstrap techniques provide on-line error assessment and par ameter inference.