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Welcome to the IMS Digital PreDistortion (DPD) competition home page!

Introduction

DPD is today a commonly used method for linearization of RF transmitters. However, further developments are still needed. For this reason the “Power Amplifier Linearization Through Digital Pre-distortion Linearization” student design competition (SDC) at the International Microwave Symposium was proposed in 2014. Since then, every year the DPD competition has been celebrated and will run again this year! The competition also serves as a benchmark between digital linearization algorithms because it makes possible to evaluate them on a common system, by means of the remote access.

In order to give the participants a possibility to test their linearization algorithms in advance, this webpage was created by Chalmers University to make available all the information and remote access mechanisms to use the competition’s state-of-art measurement setup in advance. The overall infrastructure is called RF WebLab and thanks to the generous sponsoring of dedicated measurement equipment from National Instruments, Chalmers University has made such infrastructure permanently available for worldwide DPD developers. This makes it possible for those that do not have access to equipment yet to make measurements using a state-of-art experimental setup and thereby increase the understanding of hardware imperfections on signal quality in modern communication system transmitters.

SDC History

The IMS DPD SDC was first time arranged in 2014 to find a suitable DPD for a Doherty PA operating under carrier-aggregated LTE signals with distinct bandwidths but similar average power. F. Barradas and L. Nunes from Universidade de Aveiro in Portugal were the winners. The goal of the 2015 year edition of the competition was to compensate the distortion that a GaN power amplifier introduces in a realistic burst-like wideband signal scenario. The 2015 winners were D. Lopez and T. Wang from CTTC / Universitat Politècnica de Catalunya (UPC) in Spain. In 2016 the goal was to linearize a GaN Doherty PA in a dual-band scenario. The 2016 winners were Noel Kelly and Wenhui Cao from University College Dublin (UCD) in Ireland. In 2017 the goal was to design an appropriate DPD algorithm for the linearization of a PA with dynamic supply to be used in 4G handsets. The winners were Harald Enzinger and Karl Freiberger, from Graz University of Technology (TU Graz) in Austria. Visit the Winners page for photos and complete results!

Chalmers University organized the DPD competition in 2014 and 2015. In order to allow Chalmers’ students to participate and also to involve other research groups in the initiative, Universidade de Aveiro organitzed the SDC in 2016, and Universitat Politècnica de Catalunya organitzed the SDC in 2017.

This year’s edition

In 2019 the DPD competition is organized by Tsinghua University (THU) . We wish to thank Rohde & Schwarz which sponsors with measurement equipment and the IEEE MTT-9 and MTT-11 Technical Committees for their continued support to organize, advertise and fund the prizes awarded in this SDC initiative. Finally, we would like to thank Chalmers University and Universitat Politècnica de Catalunya for their availability and support to organize this year’s competition.

This homepage (will be) updated to provide all the instructions and mechanisms to remotely access this year’s measurement system called THUWebLab, deployed in Beijing (China) by THU, will be opened for competiters  during the IMS2019 SDC competition.The detailed instrument list is as follows:

• Two GaN HEMT based Doherty PAs.
• Commercial couplers to generate and control the crosstalk as well as couple the PAs’ output signal.
• Vector signal generator SMW200A with broadband analysis bandwidth to support at least 100MHz bandwidth input signal.
• Two spectrum analyzer FSW series with 2GHz analysis bandwidth to capture the output signals of two PAs respectively.

Detailed information about accessing the THUWebLab, system, including files for signal generation, waveform upload/download and DPD scoring (all them to be employed under the MATLAB environment), and the contest rationale are given on Competition Details submenu. The measurement setup is described in more detail on Measurement Setup submenu.

 

 

 

 

 

Contact persons for IMS2019:

Prof. Wenhua Chen, chenwh@tsinghua.edu.cn, (+86) 10-62795158

Mr. Hermann Boss, Hermann.Boss@rohde-schwarz.com, (+49) 89412913606

Prof. Pere L. Gilabert, plgilabert@tsc.upc.edu (+34) 934137211

Ms. Xin Liu, x-liu17@mails.tsinghua.edu.cn, (+86) 18811301572