Improved Digital Predistortion for Concurrent Multiband Transmission Using Frequency Relocation
Artikel i vetenskaplig tidskrift, 2023
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.
Predistortion
digital predistortion
Complexity
power amplifier (PA)
Radio transmitters
Bandwidth
frequency relocation
Dual band
Baseband
Gain
concurrent multiband
digital predistorter (DPD)
Finite impulse response filters
Författare
Björn Langborn
Chalmers, Elektroteknik, Kommunikation, Antenner och Optiska Nätverk
Christian Fager
Chalmers, Mikroteknologi och nanovetenskap, Mikrovågselektronik
Rui Hou
Ericsson AB
Thomas Eriksson
Chalmers, Elektroteknik, Kommunikation, Antenner och Optiska Nätverk
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
2771-957X (ISSN) 2771-9588 (eISSN)
Vol. 33 7 1071-1074Styrkeområden
Informations- och kommunikationsteknik
Ämneskategorier (SSIF 2011)
Telekommunikation
Signalbehandling
Annan elektroteknik och elektronik
DOI
10.1109/LMWT.2023.3257324