A de-cresting technique for polar transmitters using Envelope-Tracking (ET) and SiGe power amplifiers for mobile-WiMAX

Yan Li, Dongri Meng, Jerry Lopez, Donald Y.C. Lie, Kevin C.J. Chen, Stanley Wu, Tzu Yin Yang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

A decresting algorithm for mobile WiMAX has been developed using time domain clipping and filtering processes for a polar transmitter (TX) using Envelope-Tracking (ET) and a monolithic SiGe power amplifier (PA). RF/Analog/Digital system and circuits co-design simulations have been performed for mobile WiMAX with 64 QAM OFDM modulation format. It is found that higher power-to-average ratio (PAR) decresting can improve the adjacent channel power ratio (ACPR) and the overall TX system efficiency, but at the cost of its EVM degradation. Our system simulations show that careful design of signal decresting can improve the overall polar TX system efficiency from 28.1% to 30.3% while the TX output can still meet the stringent WiMAX TX mask and EVM specs.

Original languageEnglish
Title of host publication2009 IEEE International Conference on Microwaves, Communications, Antennas and Electronics Systems, COMCAS 2009
DOIs
StatePublished - 2009
Event2009 IEEE International Conference on Microwaves, Communications, Antennas and Electronics Systems, COMCAS 2009 - Tel Aviv, Israel
Duration: Nov 9 2009Nov 11 2009

Publication series

Name2009 IEEE International Conference on Microwaves, Communications, Antennas and Electronics Systems, COMCAS 2009

Conference

Conference2009 IEEE International Conference on Microwaves, Communications, Antennas and Electronics Systems, COMCAS 2009
CountryIsrael
CityTel Aviv
Period11/9/0911/11/09

Keywords

  • Clipping ratio (CR)
  • Decresting
  • Envelope-tracking (ET)
  • Mobile WiMAX
  • PAR
  • Polar transmitter
  • Power Amplifier (PA)

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