Patent ID: 8045642
Filing Date: 2011-10-25
Classification: H03F,H04L

Abstract:
1. An IQ-modulator pre-distortion method, said method comprising the step of pre-distorting each IQ-vector by a 2-dimensional linear transformation that depends on the value of the IQ-vector to be pre-distorted, wherein said transformation is based on polynomials in the I- and Q-components of said IQ-vector, wherein said transformation is based on a 2×2 dimensional lookup table matrix, the elements of which are sampled polynomials in the I- and Q-components of said IQ-vector, wherein one of the diagonal elements and one of the off-diagonal elements of said matrix depend on said I-component and the other diagonal element and the other off-diagonal element depend on said Q-component, and wherein said transformation is represented by the equation: where is the IQ-vector to be pre-distorted, is said matrix, is an offset vector, is the pre-distorted vector, and t is a variable representing time.