Improved Digital Predistortion for Concurrent Multiband Transmission Using Frequency Relocation
Journal article, 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
Author
Björn Langborn
Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks
Christian Fager
Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics
Rui Hou
Ericsson
Thomas Eriksson
Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
2771-957X (ISSN) 2771-9588 (eISSN)
Vol. 33 7 1071-1074Areas of Advance
Information and Communication Technology
Subject Categories (SSIF 2011)
Telecommunications
Signal Processing
Other Electrical Engineering, Electronic Engineering, Information Engineering
DOI
10.1109/LMWT.2023.3257324