Comparison of direct learning and indirect learning predistortion architectures

H Paaso, A Mammela - 2008 IEEE International Symposium on …, 2008 - ieeexplore.ieee.org
Power amplifiers in a communication system are inherently nonlinear. Digital predistorters
can compensate these nonlinearity effects. In this paper, two memory polynomial …

Predistortion of radio over fiber links: algorithms, implementation, and measurements

A Hekkala, M Hiivala, M Lasanen… - … on Circuits and …, 2011 - ieeexplore.ieee.org
Distributed antenna systems (DASs) have been proposed for use in high-data-rate wireless
communications. Connecting the central unit to remote antenna units, radio over fiber (RoF) …

Adaptive time misalignment compensation in envelope tracking amplifiers

A Hekkala, M Lasanen, A Kotelba - 2008 IEEE 10th …, 2008 - ieeexplore.ieee.org
This paper considers the compensation of time misalignment between RF and envelope
signals of envelope tracking (ET) amplifier. In particular, we propose methods to …

A novel generalized parallel two-box structure for behavior modeling and digital predistortion of RF power amplifiers at LTE applications

A Rahati Belabad, SA Motamedi, S Sharifian - Circuits, Systems, and …, 2018 - Springer
This paper presents a generalized parallel two-box structure that is proposed for modeling
and digital predistortion of power amplifiers and wireless transmitters exhibiting memory …

An accurate digital baseband predistorter design for linearization of RF power amplifiers by a genetic algorithm based Hammerstein structure

A Rahati Belabad, S Sharifian, SA Motamedi - Analog Integrated Circuits …, 2018 - Springer
In this paper, a novel digital predistorter design based on the Hammerstein structure is
proposed in order to linearize radio frequency power amplifiers. A genetic algorithm …

Nonlinear MIMO communication systems: Channel estimation and information recovery using Volterra models

CAR Fernandes - 2009 - theses.hal.science
Due to the presence of nonlinear devices such as power amplifiers (PA) and optical
instruments, the communication signals are sometimes corrupted by nonlinear distortions. In …

[PDF][PDF] MIMO Volterra modeling for nonlinear communication channels

CAR Fernandes, JCM Mota, G Favier - Learning and Nonlinear …, 2010 - researchgate.net
Multiple-input multiple-output (MIMO) Volterra models have applications in different areas,
including telecommunications. An overview of the modeling of nonlinear communication …

Analysis and power diversity-based cancellation of nonlinear distortions in OFDM systems

CAR Fernandes, JCM Mota… - IEEE Transactions on …, 2012 - ieeexplore.ieee.org
One of the main drawbacks of orthogonal frequency division multiplexing (OFDM) systems is
the high peak-to-average power ratio (PAPR) of the transmitted signals, which can cause the …

Performance of adaptive algorithms for compensation of radio over fiber links

A Hekkala, M Lasanen - 2009 Wireless Telecommunications …, 2009 - ieeexplore.ieee.org
This paper considers the adaptive predistortion of the nonlinear distortions in a Radio over
Fiber (RoF) link. In particular, we modify and compare two adaptive algorithms developed …

Adaptive predistortion architecture for nonideal radio transmitter

M Lasanen, A Kotelba, A Hekkala… - VTC Spring 2008 …, 2008 - ieeexplore.ieee.org
A nonideal radio transmitter both distorts the desired signal and generates spectral regrowth
causing interference to adjacent channels. Predistortion techniques can be used to minimize …