Results 11 to 20 of about 4,686 (214)

A Digital Predistortion System With Extended Correction Bandwidth With Application to LTE-A Nonlinear Power Amplifiers [PDF]

IEEE Transactions on Circuits and Systems I: Regular Papers, 2014
This article presents a bandwidth extended digital predistortion system suitable for LTE-advanced applications. The proposed predistortion system uses a two-box architecture based on the cascade of a memory polynomial followed by a memoryless ...
Bensmida, Souheil, Ghannouchi, Fadhel M., Hammi, Oualid, Kwan, Andrew, Morris, Kevin A.   +4 more
core   +4 more sources

Digital Predistortion for Hybrid MIMO Transmitters [PDF]

IEEE Journal of Selected Topics in Signal Processing, 2018
Accepted for publication in IEEE Journal of Selected Topics in Signal ...
Mahmoud Abdelaziz, Lauri Anttila, Alberto Brihuega, Fredrik Tufvesson, Mikko Valkama   +4 more
openaire   +6 more sources

Small Molecule Based Organic Photo Signal Receiver for High-Speed Optical Wireless Communications. [PDF]

Adv Sci (Weinh), 2022
Organic photodiodes (OPDs) have high potential in industrial and commercial applications for their unique characteristics. The development of a small molecule‐based organic photo signal receiver for high‐speed optical wireless communications is described.
Cho S, Heo CJ, Lim Y, Oh S, Minami D, Yu M, Chun H, Yun S, Seo H, Fang F, Park JI, Ham C, Shin J, Choi T, Lim J, Kim HJ, Hong HR, Shibuya H, Yi J, Choi B, Park KB.   +20 more
europepmc   +2 more sources

Optimized MSA DPD method for improving 5G multiband optical fronthaul performance

Microwave and Optical Technology Letters, Volume 65, Issue 12, Page 3326-3332, December 2023., 2023
Abstract A modified optimized magnitude‐selective affine (OMSA) model‐based digital predistortion (DPD) is presented that introduces the weighting function into our earlier proposed magnitude‐selective affine (MSA) method with an aim to further reduce the complexity overheads without affecting performance compared to the MSA method. This model utilizes
Muhammad Usman Hadi, Ghulam Murtaza, Shafaq Kausar   +2 more
wiley   +1 more source

Non‐linear modelling and distortion compensation in optical Fast‐orthogonal frequency division multiplexing systems

IET Optoelectronics, Volume 17, Issue 4, Page 139-148, August 2023., 2023
The accuracy of the generalised memory polynomial (GMP) for the non‐linear modelling of optical Fast‐OFDM links is studied. The GMP is used for performance investigations of a distortion compensation approach to IM/DD Fast‐OFDM. Excellent BER improvements are achieved using the proposed compensation scheme, for up to 16PAM modulation and 256 Fast‐OFDM ...
Luis Carlos Vieira, Waseem Ozan, John Mitchell, Izzat Darwazeh   +3 more
wiley   +1 more source

Wiener predistorter for nonlinear satellite downlinks

International Journal of Satellite Communications and Networking, Volume 41, Issue 4, Page 392-405, July/August 2023., 2023
The nonlinear power amplifier and the analogue output channel filter add distortions to the satellite‐transmitted signal. Wiener predistorter is an effective method to deal with such signal distortions. In this work, we show that fully compensating for the channel filter group‐delay distortion degrades the performance of the Wiener predistortion system.
Azam Mehboob, Kelvin J. Layton, Gottfried Lechner, William G. Cowley   +3 more
wiley   +1 more source

Programmable photonic unitary circuits for light computing. [PDF]

Nanophotonics
Abstract Unitarity serves as a fundamental concept for characterizing linear and conservative wave phenomena in both classical and quantum systems. Developing platforms that perform unitary operations on light waves in a universal and programmable manner enables the emulation of complex light–matter interactions and the execution of general‐purpose ...
Kim K, Park K, Park H, Yu S, Park N, Piao X.   +5 more
europepmc   +2 more sources

Attention mechanism based bidirectional LSTM model for broadband power amplifier linearization

Electronics Letters, Volume 59, Issue 14, July 2023., 2023
In this letter, a novel model for broadband power amplifier (PA) linearization is proposed, namely Attention Mechanism based Bidirectional Long Short‐term Memory network (AM‐BiLSTM). In order to verify the linearization performance of the AM‐BiLSTM model, a 100 MHz bandwidth 5G new radio (5G NR) signal is employed to test the sub‐6G PA operating at 2.6‐
Rina Su, Jiacheng Wang, Gaoming Xu, Taijun Liu   +3 more
wiley   +1 more source

Doherty power amplifier with simplified out‐of‐phase power splitter for 5G applications

Electronics Letters, Volume 59, Issue 13, July 2023., 2023
Abstract This letter presents the architecture and characterization of a Doherty power amplifier (DPA) with a simplified out‐of‐phase power splitter (SOPPS) for fifth‐generation (5G) small‐cell applications. The proposed SOPPS consists of two passive components, which is conducive to chip miniaturization.
Jianqiang Chen, Zhihao Zhang, Jiajin Li, Yuhan Guan, Weilong Tang, Gary Zhang   +5 more
wiley   +1 more source

Experimental demonstration of digital predistortion for orthogonal frequency-division multiplexing-radio over fibre links near laser resonance [PDF]

, 2015
Radio over fibre (RoF), an enabling technology for distribution of wireless broadband service signals through analogue optical links, suffers from non-linear distortion. Digital predistortion has been demonstrated as an effective approach to overcome the
Fernando X.N., Gomes N.J., Hekkala A., Hekkala A., Luis Carlos Vieira, Moon H., Nathan Joseph Gomes, Song J.B., Vieira L.C., Vieira L.C., Wake D.   +10 more
core   +1 more source