Patent ID: 8615059
Filing Date: 2013-12-24
Classification: H04L

Abstract:
1. An apparatus comprising: an analog front-end of a wireless radio receiver coupled to receive an inbound signal, down-convert the inbound signal and generate an in-phase (I) component and a quadrature (Q) component of a down-converted signal as baseband I and Q outputs; an amplitude modulation detector coupled to receive the inbound signal and to detect a modulated amplitude of the inbound signal that includes both a desired signal and a distortion signal, the amplitude modulation detector providing an output that is indicative of the modulated amplitude of the inbound signal; and a baseband module coupled to receive the baseband I and Q outputs and the output from the amplitude modulation module, to process the output from the amplitude modulation module to estimate second order nonlinearity and third order nonlinearity distortions caused by nonlinear characteristics of the radio receiver in receiving both the desired signal and the distortion signal in the inbound signal, generate first coefficients to cancel the second order nonlinearity and third order nonlinearity distortions and apply the first coefficients with second coefficients that are used to cancel I/Q imbalance at an I/Q imbalance correction stage to substantially cancel the second order nonlinearity and third order nonlinearity distortions when baseband processing the baseband I and Q outputs in the baseband module.