Open Access

Modified Polar Sigma-Delta Transmitter for Multiradio Applications

  • MarthaLiliana Suarez Penaloza1,
  • Václav Valenta1, 2Email author,
  • Geneviève Baudoin1,
  • Martine Villegas1 and
  • Roman Maršálek2
EURASIP Journal on Wireless Communications and Networking20102010:979120

https://doi.org/10.1155/2010/979120

Received: 7 June 2010

Accepted: 16 September 2010

Published: 30 September 2010

Abstract

Radio transmitters capable of transforming variable envelope signals into constant envelope signals can be associated with high-efficiency switched mode power amplifiers. One of the techniques providing this conversion is Polar Sigma-Delta ( ) architecture. This approach provides efficient solution for high-dynamic signals, and, moreover, it offers flexibility in a multiradio environment. The overall concept of the polar transmitter is presented here along with novel modifications and improvements. Namely, when recombining the envelope and the phase signals, it is suggested to replace the analog mixing by a digital mixing. The impact of a frequency synthesizer with a switched loop bandwidth and its imperfections on the overall polar architecture is investigated as well. The Mobile WiMAX standard has been chosen for validation due to very high requirements in terms of power dynamics and the variable channel bandwidth. Simulation results are presented in this paper, and advantages and drawbacks of this novel approach are pointed here as well.

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Authors’ Affiliations

(1)
Université Paris-Est, ESYCOM, ESIEE Paris
(2)
Department of Radio Electronics, Brno University of Technology

Copyright

© Martha Liliana Suarez Penaloza et al. 2010

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.