3 research outputs found
Behavioural Models for Distributed Arrays of High Performance Doherty Power Amplifiers
Behavioral models are intended as high level
mathematical descriptions which require less computational effort
to simulate behavior compared to physical or circuit level
equivalent models. When designed and dimensioned properly they
are well suited to concise characterization of power amplifiers
under different operating conditions. In this paper we compare the
relative performance of several behavioral models for modelling
an asymmetric Doherty power amplifier for their use in
distributed arrays
A Novel Adaptive Pre-Distorter Using LS Estimation of SSPA Non-Linearity in Mobile OFDM Systems
Conference PaperSeveral LUT-based pre-distortion schemes using Saleh's model of traveling wave tube (TWT) HPA for compensation of RF non-linearity in various systems have been studied recently. In this paper we propose a novel parameter-based pre-distorter to enhance the power efficiency of mobile OFDM transmitters using solid-state power amplifiers (SSPA). Both the non-linearity and inverse of the non-linearity are estimated as memory-less polynomials using Least Squares (LS) criterion. A fully digital pre-distorter is then constructed with a closed-form inverse non-linearity to reduce the in-band non-linear distortion and out-of-band spectrum re-growth in the transmitter. Simulation results in 16-QAM OFDM show promising performance and simple implementation compared with the LUT method.Texas Advanced Technology ProgramNokiaNational Science Foundatio