Results 21 to 30 of about 164 (124)

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

Efficient Digital Predistortion Using Sparse Neural Network

IEEE Access, 2020
This paper proposes an efficient neural-network-based digital predistortion (DPD), named as envelope time-delay neural network (ETDNN) DPD. The method complies with the physical characteristics of radio-frequency (RF) power amplifiers (PAs) and uses a ...
Masaaki Tanio, Naoto Ishii, Norifumi Kamiya   +2 more
doaj   +1 more source

Digital Predistorters Go Multidimensional: DPD for Concurrent Multiband Envelope Tracking and Outphasing Power Amplifiers [PDF]

IEEE Microwave Magazine, 2019
Over at least the last two decades, digital predistortion (DPD) has become the most common and widespread solution to cope with the power amplifier's (PA's) inherent linearity-versus-efficiency tradeoff. When compared with other linearization techniques, such as Cartesian feedback or feedforward, DPD has proven able to adapt to the always-growing ...
Gilabert Pinal, Pere Lluís, Montoro López, Gabriel, Vegas Garcia, Ángel, Ruiz Lavin, Maria de las Nieves, García García, José Ángel   +4 more
openaire   +4 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

Analog Predistorter Averaged Digital Predistortion for Power Amplifiers in Hybrid Beam-Forming Multi-Input Multi-Output Transmitter

IEEE Access, 2020
For higher data throughput, the Massive Multi-input Multi-output (MIMO) system has been widely used in modern communication systems. Due to the circuit size and power consumption, it is difficult to integrate one Radio Frequency (RF) chain for each power
Caoyu Li, Songbai He, Fei You, Jun Peng, Peng Hao   +4 more
doaj   +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

A Dual‐Band Dual‐Output Filtering Power Amplifier Based on High‐Selectivity Filtering Impedance Transformer

International Journal of RF and Microwave Computer-Aided Engineering, Volume 2023, Issue 1, 2023., 2023
In this brief, a novel filtering impedance transformer with good selectivity and high termination impedance is proposed, of which close‐formed design equations are derived and effectively verified. Then, a dual‐band dual‐output filtering power amplifier (PA) operating at 2.4‐2.6 GHz and 3.4‐3.6 GHz is designed based on the proposed filtering impedance ...
Shuchen Zhen, Yongle Wu, Shaobo Li, Zhuoyin Chen, Weimin Wang, YongChae Jeong   +5 more
wiley   +1 more source

A Novel Digital Predistortion Identification Algorithm Based on Variable Forgetting Factor Recursive Least Square Method

International Journal of RF and Microwave Computer-Aided Engineering, Volume 2023, Issue 1, 2023., 2023
The transmitting signal of wireless communication system is impaired by the nonlinearity of RF power amplifier (PA) which leads to signal distortion and spectrum spillover, by which the signal transmission quality is affected. Digital predistortion (DPD) is an efficient and economical way to correct the nonlinear effects of power amplifiers.
Wenxian Song, Guofu Wang, Jincai Ye, Arpan Desai   +3 more
wiley   +1 more source

Design and optimisation of high‐efficient class‐F ULP‐PA using envelope tracking supply bias control for long‐range low power wireless local area network IEEE 802.11ah standard using 65 nm CMOS technology

IET Circuits, Devices &Systems, Volume 16, Issue 7, Page 553-568, October 2022., 2022
Abstract This article presents the design and optimisation of a sub‐1 GHz class‐F ultra‐low power (ULP) power amplifier (PA) in 65 nm Complementary Metal Oxide Semiconductor (CMOS) technology. An envelope tracking (ET) supply biasing technique is adopted to improve the efficiency of class‐F PA.
Muhammad Ovais Akhter, Najam Muhammad Amin, Razia Zia   +2 more
wiley   +1 more source

Performance of digital predistorter in system with analogue to digital converter

IET Communications, Volume 16, Issue 16, Page 1875-1888, October 2022., 2022
Abstract The baseband digital pre‐distortion (DPD) signal processing technique is the most cost‐effective linearisation method among other techniques to address the nonlinearity effect of the power amplifier. For communication systems containing DPD and power amplifier, it is difficult to acquire performance metrics closed‐forms for any DPD ...
Ramez Moh. Elaskary, Ahmed Hesham Mehana, Yasmine Fahmy, Mona El‐Ghoneimy   +3 more
wiley   +1 more source