Patent ID: 8005162

Claim:
A method for applying pre-distortion to a transmit signal to cancel distortion generated by a distorting element or distorting system when transmitting the transmit signal, comprising: filtering the transmit signal through a linear digital filter; generating one or more powers of the transmit signal; filtering one or more of the generated powers of the transmit signal through one or more high order term filters; applying weights w to the linear digital filter and the one or more high order term filters, the weights w representing a pre-distortion value computed based on a comparison of the transmit signal and a feedback signal derived from an output of the distorting element or distorting system; implementing the linear digital filter with one or more linear digital filter taps, each linear digital filter tap other than a first linear digital filter tap being successively delayed by one delay unit; implementing each high order term filter from one or more linear digital filters, each linear digital filter being delayed by a particular number of delay units and having one or more linear digital filter taps, each linear digital filter tap other than a first linear digital filter tap being successively delayed by one delay unit; applying a weight w to one or more of the linear digital filter taps; summing each of the linear digital filters in each high order term filter; and adding the sum of each of the high order term filters to a particular linear digital filter weight to form a first result, and applying the first result to the linear digital filter tap associated with the particular linear digital filter weight.