Dimensioning sealed enclosures for suppressing nonlinear distortions in woofers

2021 ◽  
Vol 178 ◽  
pp. 107975
Author(s):  
Jean Schmith ◽  
Luiz Paulo Luna de Oliveira
Keyword(s):  
Nonlinear Distortions

An adaptive digital predistortion for compensating nonlinear distortions in RF power amplifier with memory effects

Integration ◽  
2017 ◽  
Vol 57 ◽  
pp. 184-191 ◽  
Author(s):  
Ahmad Rahati Belabad ◽  
Seyed Ahmad Motamedi ◽  
Saeed Sharifian
Keyword(s):  
Power Amplifier ◽  
Memory Effects ◽  
Digital Predistortion ◽  
Rf Power ◽  
Rf Power Amplifier ◽  
Nonlinear Distortions ◽  
With Memory

Effect of nonlinear distortions in frequency doublers on angle-measurement errors

1977 ◽  
Vol 20 (3) ◽  
pp. 366-368
Author(s):  
B. N. Ivanov ◽  
Yu. S. Ivanov
Keyword(s):  
Measurement Errors ◽  
Angle Measurement ◽  
Frequency Doublers ◽  
Nonlinear Distortions

Measurement of small nonlinear distortions contributed by an amplitude-modulated oscillations detector

1973 ◽  
Vol 16 (2) ◽  
pp. 298-300
Author(s):  
A. V. Zen'kovich
Keyword(s):  
Nonlinear Distortions

scholarly journals Digital Post-Compensation of Nonlinear Distortions in Wavelength Conversion Based on Four-Wave Mixing in a Semiconductor Optical Amplifier

2015 ◽  
Vol 33 (15) ◽  
pp. 3254-3264 ◽  
Author(s):  
Benoit Filion ◽  
An T. Nguyen ◽  
Leslie Ann Rusch ◽  
Sophie LaRochelle
Keyword(s):  
Semiconductor Optical Amplifier ◽  
Wavelength Conversion ◽  
Optical Amplifier ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Nonlinear Distortions

Compensation of nonlinear distortions in speech for automatic recognition

2015 ◽  
Author(s):  
Jiri Malek ◽  
Jan Silovsky ◽  
Petr Cerva ◽  
Zbynek Koldovsky ◽  
Jan Nouza ◽  
...  
Keyword(s):  
Automatic Recognition ◽  
Nonlinear Distortions

scholarly journals Hardware Design of a High Dynamic Range Radio Frequency (RF) Harmonic Measurement System

Instruments ◽  
2018 ◽  
Vol 2 (3) ◽  
pp. 16 ◽  
Author(s):  
Ram Narayanan ◽  
Kyle Gallagher ◽  
Gregory Mazzaro ◽  
Anthony Martone ◽  
Kelly Sherbondy
Keyword(s):  
Radio Frequency ◽  
Measurement System ◽  
High Power ◽  
Nonlinear Distortion ◽  
Dynamic Range ◽  
Low Level ◽  
Rf Systems ◽  
Nonlinear Distortions ◽  
Circuit Elements ◽  
Rf Circuit

Radio frequency (RF) circuit elements that are traditionally considered to be linear frequently exhibit nonlinear properties that affect the intended operation of many other RF systems. Devices such as RF connectors, antennas, attenuators, resistors, and dissimilar metal junctions generate nonlinear distortion that degrades primary RF system performance. The communications industry is greatly affected by these unintended and unexpected nonlinear distortions. The high transmit power and tight channel spacing of the communication channel makes communications very susceptible to nonlinear distortion. To minimize nonlinear distortion in RF systems, specialized circuits are required to measure the low level nonlinear distortions created from traditionally linear devices, i.e., connectors, cables, antennas, etc. Measuring the low-level nonlinear distortion is a difficult problem. The measurement system requires the use of high power probe signals and the capability to measure very weak nonlinear distortions. Measuring the weak nonlinear distortion becomes increasingly difficult in the presence of higher power probe signals, as the high power probe signal generates distortion products in the measurement system. This paper describes a circuit design architecture that achieves 175 dB of dynamic range which can be used to measure low level harmonic distortion from various passive RF circuit elements.

scholarly journals Algorithm of FBG Spectrum Distortion Correction for Optical Spectra Analyzers with CCD Elements

2021 ◽  
Author(s):  
Vladimir Anfinogentov ◽  
Kamil Karimov ◽  
Artem Kuznetsov ◽  
Ilnur Nureev ◽  
Airat Sakhabutdinov ◽  
...  
Keyword(s):  
Nonlinear Distortion ◽  
Spectrum Analyzer ◽  
Distortion Correction ◽  
Optical Spectrum Analyzer ◽  
Measuring Systems ◽  
Central Wavelength ◽  
Charge Coupled Device ◽  
Nonlinear Distortions ◽  
Mathematical Processing ◽  
Nonlinear Spectrum

Abstract: Nonlinear spectrum distortions are caused by the peculiarities of the operation of charge-coupled device elements (CCD), in which the signal exposition time (TINT) is one of the significant parameters. A change of TINT on a CCD leads to a nonlinear distortion of the resulting spectrum. Nonlinear distortion of the spectrum, in its turn, leads to errors in determining the central wavelength of Fiber Bragg Gratings (FBG) and spectrally sensitive sensors, which, in general, negatively affects the accuracy of measuring systems. The paper proposes an algorithm for correcting nonlinear distortions of the spectrum obtained on a spectrum analyzer using CCD as a receiver. It is shown that preliminary calibration of the optical spectrum analyzer with subsequent mathematical processing of the signal makes it possible to make corrections in the resulting spectrum, thereby leveling the errors caused by measurements at different TINT.

scholarly journals Investigation of sub-carrier multiplexed fiber optic link supporting WLAN and WCDMA

2021 ◽  
Author(s):  
Roland M. C. Yuen
Keyword(s):  
Access Control ◽  
Medium Access Control ◽  
Mobile Communication ◽  
Fiber Optic ◽  
Multipath Fading ◽  
Numerical Results ◽  
Optical Noise ◽  
Medium Access ◽  
Air Interface ◽  
Nonlinear Distortions

In this thesis, an optical fiber based radio access architecture that simultaneously provides services of the wireless local area network (WLAN) and the third generation (3G) mobile communication system is investigated. The sub-carrier multiplexed (SCM) technique of the fiber optic system is considered. The SCM architecture does not require frequency conversion and plays an important role enabling the WLAN to complement the cellular mobile communication systems so that the user can have both services as needed. In the SCM architecture, the two mediums that signals propagate are the air interface and the radio over fiber (ROF) link. In the air interface, the signal experience path loss and multipath fading that have effect on the system performance. The ROF link introduces nonlinear distortions and optical noise. The uplink and downlink analysis are performed in this thesis considering all the impairments from the air interface and the ROF link. Thereafter, numerical results are generated for both the uplink and downlink to illustrate the performance of the SCM architecture. The analysis identifies the interdependent relationship of the WLAN and the WCDMA system. The numerical results graphically illustrate such interdependent relationship. In the downlink, a 5 km ROF link operating at optimal power can support a WCDMA system with 1 km radius of coverage that has 26 dB of signal to distortion and noise ratio (SDNR); and a WLAN system with 400 m radius of coverage that has 27 dB of SDNR. The throughput of IEEE 802.11 WLAN depends on the medium access control. Hence, the medium access control is investigated and the throughput expression is modified to adapt to the SCM architecture where signals travel extra distance in a fiber.

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