Digital predistortion for concurrent dual-band transmitter using a 2D LUT based method

Sheng Lung Cheng, Wen-Rong Wu, Chun Hsien Peng, Chen Jui Hsu, Paul Liang

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

1 Scopus citations

Abstract

The digital predistortion (DPD) technique has been utilized in radio-frequency power amplifier linearization for its low cost and good performance. However, the conventional single-band DPD design is not applicable to the concurrent dual-band transmitters since the cross modulations are induced. The two-dimensional (2D) polynomial based DPD has been proposed as a remedy. Despite its good performance, the main drawbacks are the high computational complexity for the identification of the DPD coefficients and the high implementation complexity. It is known that the look-up-table (LUT) based method, which has been applied in conventional single-band transmitters, can effectively overcome the problems. In this paper, we consider a 2D LUT based DPD for the concurrent dual-band transmitters. First, we formulate a cost function from which the elements of the tables can be obtained through the optimization. Then, we propose an adaptive algorithm using the gradient-descent (GD) method to conduct the search. Moreover, we propose a practical method to implement the GD method which can significantly reduce the computational and implementation complexities. Finally, some measurement results are presented to demonstrate that the proposed algorithm has the satisfactory performance.

Original languageEnglish
Title of host publication2015 IEEE 16th Annual Wireless and Microwave Technology Conference, WAMICON 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479975211
DOIs
StatePublished - 9 Jun 2015
Event2015 16th IEEE Annual Wireless and Microwave Technology Conference, WAMICON 2015 - Cocoa Beach, United States
Duration: 13 Apr 201515 Apr 2015

Publication series

Name2015 IEEE 16th Annual Wireless and Microwave Technology Conference, WAMICON 2015

Conference

Conference2015 16th IEEE Annual Wireless and Microwave Technology Conference, WAMICON 2015
CountryUnited States
CityCocoa Beach
Period13/04/1515/04/15

Keywords

  • Digital predistortion (DPD)
  • Dual-band transmitter
  • Look-up table (LUT)

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