Patent ID: 8577311
Filing Date: 2013-11-05
Classification: H03F,H04B

Abstract:
1. A method comprising: performing predistortion on a baseband signal using a static characteristic under a first operating condition to produce a predistorted baseband signal; determining a second operating condition; comparing the first operating condition to the second operating condition; and modifying a property of the predistorted baseband signal based on the static characteristic and the comparison of the first operating condition to the second operating condition by scaling a linear gain component and/or a nonlinear component of the baseband signal, wherein comparing the first operating condition to the second operating condition results in determining a difference in one or more of the following: temperature, supply voltage, operating frequency, load condition, or bias setting; determining an operating condition characteristic based on the comparison of the first operating condition to the second operating condition; determining a single static nonlinear function that represents the operating condition characteristic; scaling the single static nonlinear function by a constant based on the comparison of the first operating condition to the second operating condition; and modifying the property of the predistorted baseband signal based on the scaled single static nonlinear function.