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Sub-band Digital Predistortion for Noncontiguous Transmissions: Algorithm Development and Real-Time Prototype Implementation

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

Details

Original languageEnglish
Title of host publication2015 49th Asilomar Conference on Signals, Systems and Computers
PublisherIEEE
Number of pages7
ISBN (Electronic)978-1-4673-8576-3
DOIs
Publication statusPublished - Feb 2016
Publication typeA4 Article in a conference publication
EventAsilomar Conference on Signals, Systems and Computers -
Duration: 1 Jan 1900 → …

Publication series

Name
ISSN (Electronic)1058-6393

Conference

ConferenceAsilomar Conference on Signals, Systems and Computers
Period1/01/00 → …

Abstract

This article proposes a novel, reduced complexity, block-adaptive digital predistortion (DPD) technique for mitigating the spurious emissions that occur when amplifying spectrally noncontiguous signals with a nonlinear power amplifier (PA). The introduced DPD solution is designed for real-time scenarios where a loop delay exists in the DPD system. By a proper choice of the DPD parameters, the technique is shown to be robust against arbitrarily long loop delays while not sacrificing DPD linearization performance and convergence speed. Moreover, the proposed DPD solution has lower complexity compared to previously proposed solutions in the literature while giving excellent linearization performance in terms of mitigating the spurious emissions. Real-time implementations of the algorithm on the WARP platform are developed, including considerations for several key trade-offs in the hardware design to balance the robustness, performance and complexity. The simulations and real-time FPGA experiments evidence excellent and robust performance in real-life situations with highly nonlinear PAs and arbitrary loop delays.

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