Improved Digital Predistortion for Concurrent Multiband Transmission Using Frequency Relocation

In concurrent multiband settings with large carrier spacings between bands, digital predistorter (DPD) implementations face the issue of how to linearize a sparse signal spectrum spanned over large bandwidths at low computational complexity. Frequency relocation is one possible approach that involve...

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Bibliographic Details
Published in:IEEE microwave and wireless technology letters (Print) 2023-07, Vol.33 (7), p.1-4
Main Authors: Langborn, Bjorn, Fager, Christian, Hou, Rui, Eriksson, Thomas
Format: Article
Language:English
Subjects:
Bandwidth
Bandwidths
Baseband
Carrier density
Complexity
concurrent multiband
digital predistorter (DPD)
digital predistortion
Dual band
Finite impulse response filters
frequency relocation
Gain
power amplifier (PA)
Predistortion
Radio transmitters
Relocation
Transmitters
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Summary:In concurrent multiband settings with large carrier spacings between bands, digital predistorter (DPD) implementations face the issue of how to linearize a sparse signal spectrum spanned over large bandwidths at low computational complexity. Frequency relocation is one possible approach that involves relocating baseband carriers to have reduced frequency spacing with the help of band-limiting functions, to yield a denser and smaller signal bandwidth for the DPD to linearize. In this letter, frequency relocation for transmitters with frequency-varying gain and phase is explicitly considered. It is shown that band-wise preequalization during frequency relocation can reduce the computational complexity for a certain allowed in-band error.
ISSN:2771-957X
2771-9588
2771-9588
DOI:10.1109/LMWT.2023.3257324