Patent ID: 9735811
Date: 2017-08-15
CPC Classifications: H03F,H04B,H04L

Claim:
1. A signal manipulation unit for use in a network element of a telecommunications network, comprising: a non-linear device for manipulating a signal; a digital pre-distortion unit adapted to generate a pre-distortion function, using a set of stored parameters, and to apply the pre-distortion function to the signal before it reaches the non-linear device so as to compensate for nonlinearities in the device; an adaptation unit adapted to receive feedback from an output of the non-linear device and to adapt the parameters in response to the received feedback; and a storage unit for storing the parameters used by the pre-distortion unit to generate the pre-distortion function; wherein the digital pre-distortion unit comprises: and wherein the pre-distortion unit is configured so that, at the end of the time period having the predetermined length, the signal distorter stops generating the first pre-distortion function, and starts generating a second pre-distortion function generated on the basis of a second set of parameters; and shortly before the start of a subsequent discrete increase in power applied to the device, the signal distorter starts generating the first pre-distortion function on the basis of the first set of parameters.