Patent ID: 6940919

Claim:
A method of predistorting a complex baseband signal x having an in-phase component I and a quadrature component Q, said method comprising the steps of: sampling the complex baseband signal x to obtain k samples I k of the in-phase component and k samples Q k of the quadrature component; for each of the obtained samples determining a respective distortion factor D k ={(atanh (Cx k ))/Cx k }e 31 jΦ k , where Φ k =(πx k tanh (Cx k ))/6, x k is the magnitude of the sample k, and C is a scaling factor; multiplying each of the samples I k of the in-phase component and each of the samples Q k of the quadrature component by its respective distortion factor D k to obtain a predistorted in-phase component sample and a predistorted quadrature component sample; and combining the predistorted in-phase component samples and the predistorted quadrature component samples to provide a predistorted combined signal.