A wideband digital predistorter for a doherty power amplifier using a direct learning memory effect filter

Kenichi Horiguchi*, Naoko Matsunaga, Kazuhisa Yamauchi, Ryoji Hayashi, Moriyasu Miyazaki, Toshio Nojima

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

This paper presents a digital predistorter with a wideband memory effect compensator for a Doherty power amplifier (PA). A simple memory-predistortion model, which consists of a look-up-table (LUT) and an adaptive filter equalizing memory effects, and a new memory effect estimation algorithm using a direct-learning architecture are proposed. The proposed estimation algorithm has an advantage that a transfer function of a feedback circuit does not affect the learning process. The pre-distorter is implemented in a field programmable gate array (FPGA) and a digital signal processor (DSP). The transmitter has achieved distortion level of -50.8 dBr at signal bandwidth away from the carrier, and PA module efficiency of 24% with output power of 43 dBm at 2595 MHz under a 20 MHz-bandwidth orthogonal frequency division multiplexing (OFDM) signal using laterally diffused metal oxide semiconductor (LDMOS) FETs. Copyright copy; 2010 The Institute of Electronics, Information and Communication Engineers.

Original languageEnglish
Pages (from-to)975-982
Number of pages8
JournalIEICE Transactions on Electronics
VolumeE93-C
Issue number7
DOIs
Publication statusPublished - 2010 Jul
Externally publishedYes

Keywords

  • Adaptive filter
  • Doherty amplifier
  • Memory effect
  • Power amplifier
  • Predistortion

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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