Fadhel M. Ghannouchi

Concurrent dual band digital predistortion using look up tables with variable depths

A concurrent dual band predistorter implementation using look up tables is presented in this paper. The power amplifier introduces the main source of nonlinearity in a transmitter chain; and the distortion is further enhanced when sending signals in multiple carrier frequencies. Using a dual band predistorter based on a memory polynomial model allows for the compensation of these nonlinearities by taking into account both signals. Converting the coefficients to look up tables reduces the number of arithmetic operations needed in a signal processor. Results are presented with the conventional dual band predistorter and the look up table predistorter in operating bands 880 MHz and 2140 MHz, showing the linearization capability and accuracy with the proposed implementation agrees with the conventional predistorter.

Behavioral Modeling and Predistortion of Wideband Wireless Transmitters: Ghannouchi/Behavioral Modeling and Predistortion of Wideband Wireless Transmitters

Covers theoretical and practical aspects related to the behavioral modelling and predistortion of wireless transmitters and power amplifiers. It includes simulation software that enables the users to apply the theory presented in the book. In the first section, the reader is given the general background of nonlinear dynamic systems along with their behavioral modelling from all its aspects. In the second part, a comprehensive compilation of behavioral models formulations and structures is provided including memory polynomial based models, box oriented models such as Hammerstein-based and Wiener-based models, and neural networks-based models. The book will be a valuable resource for design engineers, industrial engineers, applications engineers, postgraduate students, and researchers working on power amplifiers modelling, linearization, and design.