Nonlinear distortion
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End-to-end Optimized Image Compression Open
We describe an image compression method, consisting of a nonlinear analysis transformation, a uniform quantizer, and a nonlinear synthesis transformation. The transforms are constructed in three successive stages of convolutional linear fi…
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A Precision Analysis of Camera Distortion Models Open
This paper addresses the question of identifying the right camera direct or inverse distortion model, permitting a high subpixel precision to fit to real camera distortion. Five classic camera distortion models are reviewed and their preci…
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Review—Nonlinear Electrochemical Impedance Spectroscopy Open
Nonlinear Electrochemical Impedance Spectroscopy (NLEIS) is a method of characterizing an electrochemical systems by applying a large amplitude sinusoidal perturbation signal. This article presents a comprehensive review of existing litera…
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Design of HIFU Transducers for Generating Specified Nonlinear Ultrasound Fields Open
Various clinical applications of high-intensity focused ultrasound have different requirements for the pressure levels and degree of nonlinear waveform distortion at the focus. The goal of this paper is to determine transducer design param…
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Prediction of Nonlinear Distortion in Wideband Active Antenna Arrays Open
In this paper we propose a technique for comprehensive analysis of nonlinear and dynamic characteristics of multi-antenna transmitters (TXs). The analysis technique is enabled by the development of a Volterra series-based dual-input model …
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Compensation of Nonlinearity of Voltage and Current Instrument Transformers Open
This paper aims at characterizing and improving the metrological performances of current and voltage instrument transformers (CTs and VTs) in harmonic measurements in the power system. A theoretical analysis is carried out to demonstrate t…
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Harmonic Distortion Compensation in Voltage Transformers for Improved Power Quality Measurements Open
Monitoring voltage harmonics represents one of the most important tasks in power quality assessment. In particular, the employed instrument transformer plays a key role in the achieved accuracy. Its harmonic measurement performance is typi…
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DISTORTION IMMUNITY OF MLS-DERIVED IMPULSE RESPONSE MEASUREMENTS Open
Maximum length sequences (MLS) are becoming widely used as an accurate method of deter-mining the t rnpque response of audio transducers Although MLS techniques offer an enhanced immunity to noise and distortion compared to periodic impuls…
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Underwater Wireless Optical Communications Using Silicon Photo-Multipliers Open
We study the use of Silicon photo-multipliers (SiPMs) for underwater wireless optical communications (UWOC) and discuss their main interests and drawbacks, compared with photo-multiplier tubes. This comparison is mainly based on practical …
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Digital Predistortion for Joint Mitigation of I/Q Imbalance and MIMO Power Amplifier Distortion Open
This paper analyzes the joint effects of in-phase and quadrature (I/Q) imbalance and power amplifier (PA) distortion for RF multiple input multiple output (MIMO) transmitters in the presence of crosstalk. This paper proposes candidate mode…
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An Iterative Optimization Algorithm for Lens Distortion Correction Using Two-Parameter Models Open
We present a method for the automatic estimation of two-parameter radial distortion models, considering polynomial as well as division models. The method first detects the longest distorted lines within the image by applying the Hough tran…
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Peak-to-Average Power Ratio Reduction of FBMC/OQAM Signal Using a Joint Optimization Scheme Open
Owing to the signal structure difference between the filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) and the orthogonal frequency-division multiplexing (OFDM) systems, the existing technologies to reduce th…
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Predistortion-Based Linearization for 5G and Beyond Millimeter-Wave Transceiver Systems: A Comprehensive Survey Open
The next-generation (5G/6G) wireless communication aims to leapfrog the currently occupied sub-6 GHz spectrum to the wideband millimeter-wave (MMW) spectrum. However, MMW spectrums with high-order modulation schemes drive the power amplifi…
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Adaptive Sparse Dictionary Based Kernel Minimum Symbol Error Rate Post-Distortion for Nonlinear LEDs in Visible Light Communications Open
Visible light communications (VLC) has emerged as one of the prominent technologies to cater to the ever-increasing high-speed-data demand for proposed fifth-generation (5G) systems. However, two main issues affect the performance of VLC i…
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Digital Self-Interference Cancellation for Asynchronous In-Band Full-Duplex Underwater Acoustic Communication Open
To improve the throughput of underwater acoustic (UWA) networking, the In-band full-duplex (IBFD) communication is one of the most vital pieces of research. The major drawback of IBFD-UWA communication is Self-Interference (SI). This paper…
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Nonlinear Compensation of Multi-CAP VLC System Employing Clustering Algorithm Based Perception Decision Open
Nonlinearities induced by the electrical amplifiers and the optoelectronic devices can be detrimental effects in visible light communication (VLC) systems. In this paper, clustering algorithm based perception decision (CAPD) is proposed to…
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Deep Neural Network-Based Digital Pre-Distortion for High Baudrate Optical Coherent Transmission Open
High-symbol-rate coherent optical transceivers suffer more from the critical responses of transceiver components at high frequency, especially when applying a higher order modulation format. Recently, we proposed in [20] a neural network (…
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Compensation of Current Transformers’ Nonlinearities by Tensor Linearization Open
With the proliferation of harmonic sources in power systems, current transformers (CTs), which are the most widely used current transducers in power systems, will have to measure and monitor signals with increasing levels of distortion. Th…
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Residual Neural Networks for Digital Predistortion Open
Tracking the nonlinear behavior of an RF power amplifier (PA) is challenging. To tackle this problem, we build a connection between residual learning and the PA nonlinearity, and propose a novel residual neural network structure, referred …
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Detection of Signals in MC–CDMA Using a Novel Iterative Block Decision Feedback Equalizer Open
This paper presents a technique to mitigate multiple access interference (MAI) in multicarrier code division multiple access (MC-CDMA) wireless communications systems. Although under normal circumstances the MC-CDMA system can achieve high…
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Deep Neural Network Equalization for Optical Short Reach Communication Open
Nonlinear distortion has always been a challenge for optical communication due to the nonlinear transfer characteristics of the fiber itself. The next frontier for optical communication is a second type of nonlinearities, which results fro…
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Determination of Inactive Powers in a Single-Phase AC Network Open
Based on the development of the theory of reactive power and distortion power, starting with the works of Fryze and Budeanu, it has been found that the contradictions in the definition of the components of inactive powers are caused by err…
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Characterization of dynamic distortion in LED light output for optical wireless communications Open
Light-emitting diodes (LEDs) are widely used for data transmission in emerging optical wireless communications (OWC) systems. This paper analyzes the physical processes that limit the bandwidth and cause nonlinearities in the light output …
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Low-complexity selective mapping technique for PAPR reduction in downlink power domain OFDM-NOMA Open
To support ultra-massive connectivity, non-orthogonal multiple access (NOMA) techniques are expected to be used in 6G instead of conventional orthogonal multiple access (OMA) techniques. Furthermore, given that orthogonal frequency divisio…
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Modeling of Semiconductor Substrates for RF Applications: Part II—Parameter Impact on Harmonic Distortion Open
This article presents the accurate modeling results of the nonlinear behavior of a wide range of silicon-based substrates at RF. The TCAD-based model includes carrier inertia effects and captures the transient nonequilibrium phenomena in t…
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An Iterative Distortion Compensation Algorithm for Camera Calibration Based on Phase Target Open
Camera distortion is a critical factor affecting the accuracy of camera calibration. A conventional calibration approach cannot satisfy the requirement of a measurement system demanding high calibration accuracy due to the inaccurate disto…
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Digital Predistorters Go Multidimensional: DPD for Concurrent Multiband Envelope Tracking and Outphasing Power Amplifiers Open
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Correction of image radial distortion based on division model Open
This paper presents an approach for estimating and then removing image radial distortion. It works on a single image and does not require a special calibration. The approach is extremely useful in many applications, particularly those wher…
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A tutorial on fiber Kerr nonlinearity effect and its compensation in optical communication systems Open
The advent of silica-based low-cost standard single-mode fibers revolutionized the whole communication industry. The deployment of optical fibers in the networks induces a paradigm shift in the communication technologies used for long-haul…
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Cascaded Spline-Based Models for Complex Nonlinear Systems: Methods and Applications Open
In this paper, we present a class of cascaded nonlinear models for complex-valued system identification, aimed at baseband modeling of nonlinear radio systems. The proposed models consist of serially connected elementary linear and nonline…