On the Maximum Efficiency of Power Amplifiers in OFDM Broadcast Systems with Envelope Following

  • Robert Wolf
  • Frank Ellinger
  • Ralf Eickhoff
Part of the Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering book series (LNICST, volume 45)


We suggest a method for determining the efficiency of the power amplifier of an OFDM broadcast system. We present how far the efficiency of conventional power amplifiers can be increased by applying envelope following. The dependency of the efficiency on the probability of clipping is derived. In this context all three possibilities of operating point adjustment are investigated. Finally, we show that by adjusting only the operating point voltage of the power amplifier the efficiency of OFDM broadcast systems can be doubled.


OFDM envelope following power amplifier efficiency broadcast DVB-T operating point adjustment 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Fettweis, G.P., Ellinger, F. et al.: Cool Silicon. In: Congress Cool Silicon (2009)Google Scholar
  2. 2.
    Fettweis, G.P., Zimmermann, E.: ICT energy consumption - trends and challenges. In: 11th International Symposium on Wireless Personal Multimedia Communications (2008)Google Scholar
  3. 3.
    CDMA Development Group: CDG Stage 4 System Performance Tests (1998)Google Scholar
  4. 4.
    Groe, J.B., Larson, L.E.: CDMA Mobile Radio Design, 1st edn. Artech House, Norwood (2000), ISBN 1–58053–059–1Google Scholar
  5. 5.
    Eltholth, A.: Low Crest Factor Modulation Techniques for Orthogonal Frequency Division Multiplexing (OFDM). In: UbiCC, vol. 2(5) (2007)Google Scholar
  6. 6.
    Rhode, Schwarz: Der Crest-Faktor bei DVB-T-(OFDM-)Sendeanlagen und seine Auswirkung auf die Dimensionierung der Leistungskomponenten, – Application Note 7TS02 (2007)Google Scholar
  7. 7.
    Proakis, J.G.: Digital Communications, 4th edn. McGraw-Hill, New York (2000), ISBN 0–07–232111–3MATHGoogle Scholar
  8. 8.
    Cripps, S.C.: RF Power Amplifiers for Wireless Communications, 2nd edn. Artech House, Norwood (2006), ISBN 1–59693–018–7Google Scholar
  9. 9.
    Haßler, F., Ellinger, F., Carls, J.: Analysis of buck-converters for efficiency enhancements in power amplifiers for wireless communication. In: IEEE Microwave and Optoelectronics Conference, pp. 616–620 (2007)Google Scholar

Copyright information

© ICST Institute for Computer Science, Social Informatics and Telecommunications Engineering 2010

Authors and Affiliations

  • Robert Wolf
    • 1
  • Frank Ellinger
    • 1
  • Ralf Eickhoff
    • 1
  1. 1.Chair for Circuit Design and Network TheoryTechnische Universität DresdenGermany

Personalised recommendations