Results 31 to 40 of about 164 (124)
Analysis and Digital Predistortion of in-Band Cross Modulation in Concurrent Multi-Band Transmitters
IEEE Access, 2022 In multiband transmitters where two or more radios share the same power amplifier (PA), interferences can usually be kept below an acceptable level with the help of multi-band digital predistortion (DPD) techniques.
Yunsik Hahn +5 more
doaj +1 more source
Practical Demonstration of 5G NR Transport Over-Fiber System with Convolutional Neural Network
Telecom, 2022 This study describes an experimental realization using digital predistortion (DPD) for a fifth generation (5G) multiband new radio (NR) optical front haul (OFH) based Radio over Fiber (RoF) link.
Muhammad Usman Hadi
doaj +1 more source
Microwave and Optical Technology Letters, Volume 64, Issue 4, Page 827-834, April 2022., 2022 Abstract This paper presents a novel magnitude‐selective affine (MSA) based digital predistortion (DPD) method for the performance investigation of multiband 5G new radio (NR) based analog radio over fiber link. The proposed MSA‐DPD method is derived from the canonical piecewise linear (CPWL) based model by employing MSA functions, which can result in ...
Muhammad Usman Hadi +2 more
wiley +1 more source
IEEE Access, 2021 This paper proposes a new digital predistortion (DPD) scheme for linearizing millimeter-wave hybrid beamforming transmitters using observation receivers with low-bit resolution analog-to-digital converters (ADCs).
Ahmed Ben Ayed +3 more
doaj +1 more source
Scientific Programming, Volume 2022, Issue 1, 2022., 2022 In this paper, an autoregressive spectral estimation using a multilayered neural network is proposed to reduce the nonlinearities of 5G MIMO power amplifiers and increase the signal‐transmitting qualities. The proposed method adopts the two‐sided doubly exponential lattice algorithm to achieve the most suitable estimation for in‐band compensation. Also,
Xin Cao +3 more
wiley +1 more source
IEEE Access, 2023 Recently, new emerging techniques of neuromorphic hardware render spiking neuron networks (SNN) promising as an energy-efficient solution for artificial intelligence (AI).
Siqi Wang +2 more
doaj +1 more source
IET Microwaves, Antennas &Propagation, Volume 15, Issue 12, Page 1577-1593, 7 October 2021., 2021 Abstract This study presents a switchable Doherty power amplifier (S‐DPA) based on dual compensating reactance and adjusted drain voltage with 124% fractional bandwidth (FBW) using single‐input architecture. The proposed S‐DPA can be operated in wideband mode (WB‐MOD) and dual‐band mode (DB‐MOD) with a larger power back‐off region through one‐click ...
Rui‐Jia Liu +6 more
wiley +1 more source
Transmitter IQ Imbalance Mitigation and PA Linearization in Software Defined Radios [PDF]
Radioengineering, 2022 Radio frequency (RF) power amplifiers (PA) are efficiently linearized by adaptive digital predistortion (DPD). However, performance of DPD is severely degraded in presence of transmitter’s frequency-selective in-phase/quadrature (I/Q) imbalance.
B. Jovanovic, S. Milenkovic
doaj
Wideband IMD3 suppression through negative baseband impedance synthesis
IET Microwaves, Antennas &Propagation, Volume 15, Issue 7, Page 728-743, 10 June 2021., 2021 Abstract This article presents a power amplifier (PA) linearisation approach based on synthesising a negative impedance termination at the baseband frequency. Negative baseband termination has been previously shown to suppress intermodulation distortion (IMD) products in power amplifiers.
William Sear, Taylor W. Barton
wiley +1 more source
Neural Network DPD for Aggrandizing SM-VCSEL-SSMF-Based Radio over Fiber Link Performance
Photonics, 2021 This paper demonstrates an unprecedented novel neural network (NN)-based digital predistortion (DPD) solution to overcome the signal impairments and nonlinearities in Analog Optical fronthauls using radio over fiber (RoF) systems.
Muhammad Usman Hadi +4 more
doaj +1 more source