Research Article
Computationally Efficient Look-up-Tables for Behavioral Modelling and Digital Pre-distortion of Multi-standard Wireless Systems
@INPROCEEDINGS{10.1007/978-3-030-98002-3_3, author={Zhaoyang Han and Meabh Loughman and Yiyue Jiang and Rahul Mushini and Miriam Leeser and John Dooley}, title={Computationally Efficient Look-up-Tables for Behavioral Modelling and Digital Pre-distortion of Multi-standard Wireless Systems}, proceedings={Cognitive Radio Oriented Wireless Networks and Wireless Internet. 16th EAI International Conference, CROWNCOM 2021, Virtual Event, December 11, 2021, and 14th EAI International Conference, WiCON 2021, Virtual Event, November 9, 2021, Proceedings}, proceedings_a={CROWNCOM \& WICON}, year={2022}, month={3}, keywords={Behavioural modeling Pre-distortion Memory Polynomial Software Defined Radio FPGA}, doi={10.1007/978-3-030-98002-3_3} }- Zhaoyang Han
Meabh Loughman
Yiyue Jiang
Rahul Mushini
Miriam Leeser
John Dooley
Year: 2022
Computationally Efficient Look-up-Tables for Behavioral Modelling and Digital Pre-distortion of Multi-standard Wireless Systems
CROWNCOM & WICON
Springer
DOI: 10.1007/978-3-030-98002-3_3
Abstract
Wireless systems such as cellular networks have begun to see proposals for increased operational flexibility through reuse of the same hardware but with different signal standards. This paper presents an approach to characterise a power amplifier (PA) for multiple signal standards. Following from this, behavioural modeling demonstrates that the same coefficients trained for a single signal standard can be effectively applied to multiple signal standards. This result is used to design and implement a digital predistorter (DPD) capable of linearizing for different signal standards on a Field Programmable Gate Array (FPGA). This implementation is experimentally validated on a state-of-the-art RFSoC FPGA from Xilinx to correct for PA non-linearities in the transmit chain using an efficient hardware design. Additionally the behavioural modelling and DPD solutions have been validated using distinctly different PAs to demonstrate the proposed look up table approach is hardware agnostic and works when the appropriate dimensions are set for the dynamic nonlinear structure in each case.
