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.

frequency relocation

Finite impulse response filters

Baseband

Dual band

Radio transmitters

digital predistortion

digital predistorter (DPD)

Bandwidth

Gain

Complexity

power amplifier (PA)

concurrent multiband

Predistortion

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 1071-1074

Areas of Advance

Information and Communication Technology

Subject Categories

Telecommunications

Signal Processing

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1109/LMWT.2023.3257324

More information

Latest update

5/13/2024