Nokia Solutions and Networks Oy

Jacob Edward Longwell

Peter Y Novak

Shavantha Kularatna

Tian He

Chad Young

Peter Novak

This specification relates to digital pre-distortion of signals before power amplification during the transmission of a signal. A method comprising: receiving an input signal 1and 2subband signals associated with 1and 2centre frequencies; applying a pre-distortion to the input signal to generate a pre-distorted signal, the pre-distortion applying an inverse to a power amplification model associated with a power amplifier; and outputting the pre-distorted signal for power amplification. The power amplification model or the inverse to the power amplification model comprises a first plurality of terms and a second plurality of terms. Each of the 1and 2plurality of terms comprising a product of a complex coefficient, a power factor, and other factors depending on if it is 1or 2plurality of terms.

Dual-band digital pre-distortion system and method

As solution for predistorting a signal is presented. The solution comprises receiving () as an input a signal comprising at least two signal components on a different band, sampling () the input signal comprising linear terms, composite non-linear terms causing intermodulation outside Nyquist band of the input signal and further non-linear terms causing intermodulation inside the Nyquist band, the further non-linear terms comprising multi-band terms. Oversampling () by a given factor is applied to the signal in a first predistortion circuit for processing the linear terms and composite non-linear terms causing intermodulation outside Nyquist band; processing () the input signal without oversampling in a second predistortion circuit in parallel with the first predistortion circuit for the further non-linear terms. The rates of the output signals of the predistortion circuits are matched (), combined and filtered ().

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Dallas, TX, United States of America

Jacob Edward Longwell