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Journal articles on the topic 'Compensation of nonlinearity'

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Author: Grafiati

Published: 30 May 2022

Last updated: 31 May 2022

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1

Li, Songyu, Xinguang Du, Luyao Zhang, Ken Chen, and Shuai Wang. "Study on dynamic characteristics of underwater pressure compensator considering nonlinearity." Mechanical Sciences 11, no. 1 (June 3, 2020): 183–92. http://dx.doi.org/10.5194/ms-11-183-2020.

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Abstract. The external pressure is the biggest problem faced by underwater hydraulic systems. The strength and sealing ability of the structure are facing enormous challenges. For this problem, the common solution is to use pressure compensation technology. The pressure of the seawater is transmitted to the inside of the hydraulic system through a pressure compensator, which equalizes the return pressure of the hydraulic system and the seawater pressure. The structure of the compensation system, the volume and dynamic characteristics of the compensator, and the compensation failure caused by hydraulic oil leakage will all affect the normal operation of the underwater equipment. Therefore, it is necessary to study the pressure compensation system. This paper analyzes the pressure characteristics of the rubber-bellows type compensator. The dynamic characteristic equation of the pressure is established. Due to the strong nonlinear nature of rubber, the finite element method is used to simulate the deformation process of the rubber-bellows type pressure compensator. The relationship between the volume variation and the spring displacement of the rubber-bellows type pressure compensator is calculated by FE simulation. The relationship is brought into the theoretical equation result to obtain the pressure characteristics of the compensator. Through the control variable method, the influence of damping, total mass, effective area and spring stiffness on the internal pressure of the compensator is obtained. According to the analysis result, the damping ratio should be appropriately increased to reduce the overshoot of pressure fluctuations in the design. Since the damping is difficult to control, the total mass of the end cap, the guide post, the rubber bellows and the spring can be minimized. It also reduces the quality of the equipment. The spring stiffness and effective area have a significant influence on the steady-state pressure. A softer spring should be used and the effective area should be increased as much as possible to reduce the final steady-state pressure.

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Arpaia, P., L. Michaeli, and S. Rapuano. "Model-Based Compensation of SAR Nonlinearity." IEEE Transactions on Instrumentation and Measurement 58, no. 3 (March 2009): 541–50. http://dx.doi.org/10.1109/tim.2008.2005817.

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3

Lazzarin, G., S. Pupolin, and A. Sarti. "Nonlinearity compensation in digital radio systems." IEEE Transactions on Communications 42, no. 2/3/4 (February 1994): 988–99. http://dx.doi.org/10.1109/tcomm.1994.580207.

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4

Wang, Deng Wang, Hui Wang, Zhi Gang Liang, Shi Ying Tang, and Yan Li. "Study of Eliminating Calculation Errors in Large-Strain Measurement with Strain Gauges." Applied Mechanics and Materials 138-139 (November 2011): 548–52. http://dx.doi.org/10.4028/www.scientific.net/amm.138-139.548.

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Resistance strain gauge is common used in strain measurement, particularly in small elastic strain measurement, it has many advantages. However when the measured strain increases, the output nonlinearity of the Wheatstone bridge will become obvious; in this paper the nonlinearity error of the output in large-strain measurement is analyzed, and based on this a mathematical algorithm for nonlinearity compensation is proposed; finally the effect of the algorithm for nonlinearity compensation is proved by theoretical research and experimental treatment.

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5

Dincmen, Erkin. "Extremum seeking dead-zone pre-compensator for an industrial control system." at - Automatisierungstechnik 66, no. 6 (June 1, 2018): 471–82. http://dx.doi.org/10.1515/auto-2017-0095.

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Abstract PID type industrial controllers such as PI, PD, PID are mature control algorithms and they are intensively used in industry due to their simplicity and easily implementability. However, they start to fail when there is an unknown or unpredictable nonlinear behavior in the plant or actuator. In this paper, a novel compensation algorithm is proposed for PD type industrial control systems, which possess an unknown dead-zone nonlinearity. An extremum-seeking technique is utilized in the compensation algorithm. The aim is to propose a new, effective and robust compensator which can be added easily to an existing industrial controller without any need to change/retune the controller settings/parameters. It is shown that by adding the compensator to an existing PD control system, the sensitivity of the controller to the dead-zone nonlinearity is removed.

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6

Lee, Kyo-Beum, and Frede Blaabjerg. "Disturbance Observer-Based Simple Nonlinearity Compensation for Matrix Converter Drives." Research Letters in Electronics 2009 (2009): 1–4. http://dx.doi.org/10.1155/2009/215782.

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This paper presents a new method to compensate the nonlinearity for matrix converter drives using disturbance observer. The nonlinearity of matrix converter drives such as commutation delay, turn-on and turn-off time of switching device, and on-state switching device voltage drop is modeled by disturbance observer and compensated. The proposed method does not need any additional hardware and offline experimental measurements. The proposed compensation method is applied for high-performance induction motor drives using a 3 kW matrix converter system without a speed sensor. Simulation and experimental results show that the proposed method using disturbance observer provides good compensating characteristics.

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7

Shi, Qi, Liyu Ouyang, Jinhua She, Li Xu, Junya Imani, and Yasuhiro Ohyama. "Compensation of Stribeck-Type Nonlinear Friction in Positioning Control Using Equivalent-Input-Disturbance Approach." Journal of Advanced Computational Intelligence and Intelligent Informatics 18, no. 2 (March 20, 2014): 150–56. http://dx.doi.org/10.20965/jaciii.2014.p0150.

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A method of compensating for Stribeck-type nonlinear friction torque for a two-mass mechatronic system has been devised based on the equivalent-inputdisturbance (EID) approach. The nonlinearity in the system is treated as an input-dependent disturbance, and an EID estimator is designed that estimates it. The incorporation of the estimate into the control input compensates for the nonlinearity. Simulation results demonstrate the validity of the method and show that the compensation accuracy is closely related to the time constant of the low-pass filter.

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8

Kumar Orappanpara Soman, Sunish. "A tutorial on fiber Kerr nonlinearity effect and its compensation in optical communication systems." Journal of Optics 23, no. 12 (November 22, 2021): 123502. http://dx.doi.org/10.1088/2040-8986/ac362a.

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Abstract 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 information transfer. However, the communication using the optical fibers is affected by several linear and nonlinear effects. The most common linear effects are attenuation and chromatic dispersion, whereas the dominant nonlinear effect is the Kerr effect. The Kerr effect induces a power-dependent nonlinear distortion for the signal propagating in the optical fiber. The detrimental effects of the Kerr nonlinearity limit the capacity of long-haul optical communication systems. Fiber Kerr nonlinearity compensation using digital signal processing (DSP) techniques has been well investigated over several years. In this paper, we provide a comprehensive tutorial, including the fundamental mathematical analysis, on the characteristics of the optical fiber channel, the origin of the Kerr nonlinearity effect, the theory of the pulse propagation in the optical fiber, and the numerical and analytical tools for solving the pulse propagation equation. In addition, we provide a concise review of various DSP techniques for fiber nonlinearity compensation, such as digital back-propagation, Volterra series-based nonlinearity equalization, perturbation theory-based nonlinearity compensation, and phase conjugation. We also carry out numerical simulation and the complexity evaluation of the selected nonlinearity compensation techniques.

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9

Ren, Xiao, and Wen Mei Hou. "Research on Phase Compensation of Nonlinearity Error in Heterodyne Interferometer." Applied Mechanics and Materials 263-266 (December 2012): 435–43. http://dx.doi.org/10.4028/www.scientific.net/amm.263-266.435.

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A novel method to eliminate nonlinearity error in heterodyne interferometer is studied in the paper. A simple phase compensation system is built and the nonlinearity error is eliminated by rotating the polarizer in front of the optical detector in interferometer according to phase difference signal. The experiments demonstrate that the method is available to eliminate one-order or high-order nonlinearity in heterodyne interferometer. The effects to decrease nonlinearity error depend on high measuring precision of phase difference and high control precision of the rotating polarizer.

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10

Jun Oh Jang. "Adaptive NFN Nonlinearity Compensation for Mobile Manipulators." Journal of Next Generation Information Technology 4, no. 2 (April 30, 2013): 59–75. http://dx.doi.org/10.4156/jnit.vol4.issue2.7.

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11

Cooper, E., and R. Hampshire. "Adaptive compensation for position error signal nonlinearity." IEEE Transactions on Magnetics 38, no. 3 (May 2002): 1593–602. http://dx.doi.org/10.1109/20.999135.

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12

Saleh, A. A. M., R. M. Jopson, and T. E. Darcie. "Compensation of nonlinearity in semiconductor optical amplifiers." Electronics Letters 24, no. 15 (1988): 950. http://dx.doi.org/10.1049/el:19880647.

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13

Popović, R. S., and B. Hälg. "Nonlinearity in hall devices and its compensation." Solid-State Electronics 31, no. 12 (December 1988): 1681–88. http://dx.doi.org/10.1016/0038-1101(88)90064-0.

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14

Lee, Joon-Hee, and Seung-Ki Sul. "Inverter Nonlinearity Compensation Through Deadtime Effect Estimation." IEEE Transactions on Power Electronics 36, no. 9 (September 2021): 10684–94. http://dx.doi.org/10.1109/tpel.2021.3061285.

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15

Giacoumidis, Elias, Yi Lin, Mutsam Jarajreh, Sean O’Duill, Kevin McGuinness, Paul F. Whelan, and Liam P. Barry. "A Blind Nonlinearity Compensator Using DBSCAN Clustering for Coherent Optical Transmission Systems." Applied Sciences 9, no. 20 (October 17, 2019): 4398. http://dx.doi.org/10.3390/app9204398.

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Coherent fiber-optic communication systems are limited by the Kerr-induced nonlinearity. Benchmark optical and digital nonlinearity compensation techniques are typically complex and tackle deterministic-induced nonlinearities. However, these techniques ignore the impact of stochastic nonlinear distortions in the network, such as the interaction of fiber nonlinearity with amplified spontaneous emission from optical amplification. Unsupervised machine learning clustering (e.g., K-means) has recently been proposed as a practical approach to the blind compensation of stochastic and deterministic nonlinear distortions. In this work, the Density-Based Spatial Clustering of Applications with Noise (DBSCAN) algorithm is employed, for the first time, for blind nonlinearity compensation. DBSCAN is tested experimentally in a 40 Gb/s 16 quadrature amplitude-modulated system at 50 km of standard single-mode fiber transmission. It is shown that at high launched optical powers, DBSCAN can offer up to 0.83 and 8.84 dB enhancement in Q-factor when compared to conventional K-means clustering and linear equalisation, respectively.

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16

Zhao, Hai Bo, and Yun Guo Zhu. "A Compensation Approach of Dead-Zone Nonlinearity in Dual-Motor Driving Servo System." Applied Mechanics and Materials 389 (August 2013): 454–59. http://dx.doi.org/10.4028/www.scientific.net/amm.389.454.

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Aiming at the control problem of dual-motor driving servo system with dead-zone nonlinearity,we proposed the model of system linear part.We used describing function methods to analyze dead-zone nonlinearity characteristic.The simulation experiments of nonlinear system with dead-zone were carried out.The results of simulation show that system represents the phenomenon of zero deflection with step response,error curve exists peak at commutation time with sine response.In the end,we used compensation control strategy to weaken the impact of dead-zone nonlinearity on dual-motor driving servo system.Finally the simulation illustrates the effectiveness of the proposed compensation control strategy.

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17

Hou, Wen Mei, and Xiao Ren. "Research on Compensation of Nonlinearity in Heterodyne Interferometer." Applied Mechanics and Materials 36 (October 2010): 303–10. http://dx.doi.org/10.4028/www.scientific.net/amm.36.303.

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The demands of nano-measurement and nano-positioning now in research and industries become the challenge for heterodyne interferometer because its nonlinearity often limits the effective resolution. This paper introduces new developed method for compensation of the nonlinearity in heterodyne interferometer and explains what accuracy can be reached with demonstrations figured by the test results. On the basis of theoretical analyses and experimental investigations it shows which exactness can be expected.

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18

Zhao, Hai Bo, and Yun Guo Zhu. "A Compensation Approach of Backlash Nonlinearity in Dual-Motor Driving Servo System." Applied Mechanics and Materials 389 (August 2013): 448–53. http://dx.doi.org/10.4028/www.scientific.net/amm.389.448.

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Aiming at the control problem of dual-motor driving servo system with backlash nonlinearity, we proposed the model of system linear part. We used describing function methods to analyze backlash nonlinearity characteristic. The simulation experiments of nonlinear system with backlash were carried out. The results of simulation show that system represents residual self-oscillation with step response, nonstationarity with low speed tracking and error abrupt change produced by sinusoidal tracking reversing. In the end, we used compensation control strategy to weaken the impact of backlash nonlinearity on dual-motor driving servo system. Finally the simulation illustrates the effectiveness of the proposed compensation control strategy.

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19

Chen, Guohong, Shengjun Zhou, Jie Ni, and Hao Huang. "Adaptive Nonlinearity Compensation System for Integrated Temperature and Moisture Sensor." Micromachines 10, no. 12 (December 13, 2019): 878. http://dx.doi.org/10.3390/mi10120878.

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Measuring temperature and moisture are important in many scenarios. It has been verified that temperature greatly affects the accuracy of moisture sensing. Moisture sensing performance would suffer without temperature calibrations. This paper introduces a nonlinearity compensation technique for temperature-dependent nonlinearity calibration of moisture sensors, which is based on an adaptive nonlinear order regulating model. An adaptive algorithm is designed to automatically find the optimal order number, which was subsequently applied in a nonlinear mathematical model to compensate for the temperature effects and improve the moisture measurement accuracy. The integrated temperature and moisture sensor with the proposed adaptive nonlinear order regulating nonlinearity compensation technique is found to be more effective and yield better sensing performance.

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20

Wang, Qiang, Yang Yue, and Jon Anderson. "Compensation of Limited Bandwidth and Nonlinearity for Coherent Transponder." Applied Sciences 9, no. 9 (April 28, 2019): 1758. http://dx.doi.org/10.3390/app9091758.

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Coherent optical transponders are widely deployed in today’s long haul and metro optical networks using dense wavelength division multiplexing. To increase the data carrying capacity, the coherent transponder utilizes the high order modulation format and operates at a high baud rate. The limited bandwidth and the nonlinearity are two critical impairments for the coherent in-phase quadrature transmitter. These impairments can be mitigated by digital filters. However, to accurately determine the coefficients of these filters is difficult because the impairment from the limited bandwidth and the impairment from nonlinearity are coupled together. In this paper, we present a novel method to solve this problem. During the initial power-up, we apply a sinusoidal stimulus to the coherent IQ transmitter. We then scan the frequency and amplitude of the stimulus and monitor the output power. By curve-fitting with an accurate mathematical model, we determine the limited bandwidth, the nonlinearity, the power imbalance, and the bias point of the transponder simultaneously. Optimized coefficients of the digital filters are determined accordingly. Furthermore, we utilize a coherent IQ transponder and demonstrate that the limited bandwidth is improved by the finite impulse response filter, while nonlinearity is mitigated by the memoryless Volterra filter.

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21

Zhang, Fangyuan, Qunbi Zhuge, Meng Qiu, Xingyu Zhou, Mohammed Y. S. Sowailem, Thang M. Hoang, Meng Xiang, and David V. Plant. "Blind Adaptive Digital Backpropagation for Fiber Nonlinearity Compensation." Journal of Lightwave Technology 36, no. 9 (May 1, 2018): 1746–56. http://dx.doi.org/10.1109/jlt.2017.2785179.

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22

Zhu, Likai, and Guifang Li. "Nonlinearity compensation using dispersion-folded digital backward propagation." Optics Express 20, no. 13 (June 12, 2012): 14362. http://dx.doi.org/10.1364/oe.20.014362.

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23

Grudinin, Ivan, Hansuek Lee, Tong Chen, and Kerry Vahala. "Compensation of thermal nonlinearity effect in optical resonators." Optics Express 19, no. 8 (April 1, 2011): 7365. http://dx.doi.org/10.1364/oe.19.007365.

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24

Van den Broeck, T. "Calibrated measurements and nonlinearity compensation of narrowband amplifiers." IEEE Transactions on Microwave Theory and Techniques 43, no. 12 (1995): 2999–3006. http://dx.doi.org/10.1109/22.475666.

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25

Dutta, Lachit, Anil Hazarika, and Manabendra Bhuyan. "Nonlinearity compensation of DIC-based multi-sensor measurement." Measurement 126 (October 2018): 13–21. http://dx.doi.org/10.1016/j.measurement.2018.05.020.

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26

Wei, Haiqing, and David V. Plant. "Intra-channel nonlinearity compensation with scaled translational symmetry." Optics Express 12, no. 18 (2004): 4282. http://dx.doi.org/10.1364/opex.12.004282.

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27

Rafique, Danish. "Fiber Nonlinearity Compensation: Commercial Applications and Complexity Analysis." Journal of Lightwave Technology 34, no. 2 (January 15, 2016): 544–53. http://dx.doi.org/10.1109/jlt.2015.2461512.

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28

Tsang, Mankei, and Demetri Psaltis. "Dispersion and nonlinearity compensation by spectral phase conjugation." Optics Letters 28, no. 17 (September 1, 2003): 1558. http://dx.doi.org/10.1364/ol.28.001558.

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29

Khan, B. M., and G. S. Simin. "Third-order nonlinearity compensation in field effect transistors." Electronics Letters 47, no. 24 (2011): 1343. http://dx.doi.org/10.1049/el.2011.2839.

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30

Cabarkapa, M., N. Neskovic, A. Neskovic, and D. Budimir. "Adaptive nonlinearity compensation technique for 4G wireless transmitters." Electronics Letters 48, no. 20 (2012): 1308. http://dx.doi.org/10.1049/el.2012.2829.

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31

Liu, Xuejun, Haiying Luan, Wenbai Chen, Yue Dai, Jiandong Liu, and Bo Lan. "Electrical nonlinearity pre-compensation for CO-OFDM system." Optik 125, no. 2 (January 2014): 616–19. http://dx.doi.org/10.1016/j.ijleo.2013.05.141.

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32

Huang Bin, 黄斌, 张黎杰 Zhang Lijie, 李霞 Li Xia, and 隋琪 Sui Qi. "Fiber Nonlinearity Compensation Algorithm Based on Spectrum Compressing." Laser & Optoelectronics Progress 57, no. 23 (2020): 230601. http://dx.doi.org/10.3788/lop57.230601.

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33

BELLO, ADAMU LAWAL, SAMUEL ENIOLA AGBI, and LATEEF OLUMIDE MUSTAPHA. "CEO COMPENSATION AND FIRM PERFORMANCE: NONLINEARITY AND ASYMMETRY." International Journal of Social Sciences and Management Review 05, no. 02 (2022): 63–76. http://dx.doi.org/10.37602/ijssmr.2022.5205.

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The study examined the relationship between CEO compensation and firm financial performance of listed oil and gas companies in Nigeria. The study was conducted for a period from 2011 to 2021. The study adopted an Ex-post facto research design. The ex-post facto research design was used because the study relied heavily on already existing secondary data of all listed oil and gas companies in Nigeria. The population of the study was all the twelve (12) oil and gas companies listed on the floor of the Nigerian Stock Exchange (NSE, 2021). The sample size of the study was eight (8) oil and gas companies listed on the Nigeria stock exchange. Based on the short-run effect, the results revealed that during the favourable period, CEO remuneration Pay-out has a positive and significant association with the firm financial performance of listed oil and gas companies in Nigeria. Also, the results revealed that during the period positive outcome, CEO Dividend has a negative and a significant relationship with the firm financial performance of listed oil and gas companies in Nigeria. Finally, in the short run, the results revealed that during the favourable period, CEO Stock has a negative and significant with the firm financial performance of listed oil and gas companies in Nigeria. the study concluded based on the asymmetry results that CEO compensation has a significant effect on the financial performance of listed oil and gas companies in Nigeria. On the basis of the findings and the conclusion made above, the study recommends that: The oil and gas companies should always consider the asymmetric effect of CEO compensation in determining the kind of incentives to be given to the CEOs

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Tavares, Lucas A., Petrus E. O. G. B. Abreu, and Luis A. Aguirre. "Nonlinearity compensation based on identified NARX polynomials models." Nonlinear Dynamics 107, no. 1 (December 2, 2021): 709–25. http://dx.doi.org/10.1007/s11071-021-06797-2.

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Wang, Xiang Jiang, and Ji Song Tang. "Research of Dynamic Compensation for Hysteresis Nonlinear." Applied Mechanics and Materials 128-129 (October 2011): 985–89. http://dx.doi.org/10.4028/www.scientific.net/amm.128-129.985.

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The hysteresis nonlinearity reduces the accuracy of precision instrument..In order to mitigate the effect of the hysteresis, it is necessary to build hysteresis model and compensate hysteresis nonlinearity.The Krasnosel’skii–Pokrovkii （KP） operator is used to build hysteresis model, which the model is divided into linear part and nonlinear part. The KP compensating operator is proposed to compensate nonlinear part of hysteresis model. The Sliding model adaptive control law for the control method is deduced from the Lyapunov stability theorem. The emulational results confirmed the availability of hysteresis nonlinear compensation control.

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Hu, Hai Jiang, Ju Ju Hu, and Ying Hua Ji. "Nonlinearity Errors in Heterodyne Interferometer: A Survey." Advanced Materials Research 629 (December 2012): 511–14. http://dx.doi.org/10.4028/www.scientific.net/amr.629.511.

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As the most important error source in the heterodyne interferometer, the nonlinearity errors reduce the measurement accuracy in the nanometric or picometric measurement. This survey states both the definition of nonlinearity errors and the cause of the errors. Moreover, two kinds of methods for detection and compensation of the nonlinearity errors are also discussed respectively in this paper.

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Tang, Yao Geng, Song Gao, and Xing Qu. "Nonlinearity Compensation for Thermocouple Vacuum Gauge Using Particle Swarm Optimized Least Squares Support Vector Machine." Applied Mechanics and Materials 321-324 (June 2013): 2177–82. http://dx.doi.org/10.4028/www.scientific.net/amm.321-324.2177.

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A method for compensating nonlinear characteristic of thermocouple vacuum gauge is proposed. Least squares support vector machine (LS-SVM) is adopt as compensation model, of which parameters are optimized using particle swarm optimization (PSO) algorithm. Experimental results using data obtained on-site show that the proposed approach effectively compensates the nonlinearity characteristic, and the accuracy of this method is higher than those obtained by SVM model.

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Mingliang Deng, Mingliang Deng, Xingwen Yi Xingwen Yi, Jing Zhang Jing Zhang, Hongbo Zhang Hongbo Zhang, and Kun Qiu Kun Qiu. "Fiber nonlinearity compensation for CO-OFDM transmission with 10.7-Gb/s NRZ-OOK neighbors." Chinese Optics Letters 10, no. 11 (2012): 110602–5. http://dx.doi.org/10.3788/col201210.110602.

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Chen, Chen, Xiong Deng, Yanbing Yang, Pengfei Du, Helin Yang, and Lifan Zhao. "LED Nonlinearity Estimation and Compensation in VLC Systems Using Probabilistic Bayesian Learning." Applied Sciences 9, no. 13 (July 3, 2019): 2711. http://dx.doi.org/10.3390/app9132711.

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In this paper, we propose and evaluate a novel light-emitting diode (LED) nonlinearity estimation and compensation scheme using probabilistic Bayesian learning (PBL) for spectral-efficient visible light communication (VLC) systems. The nonlinear power-current curve of the LED transmitter can be accurately estimated by exploiting PBL regression and hence the adverse effect of LED nonlinearity can be efficiently compensated. Simulation results show that, in a 80-Mbit/s orthogonal frequency division multiplexing (OFDM)-based nonlinear VLC system, comparable bit-error rate (BER) performance can be achieved by the conventional time domain averaging (TDA)-based LED nonlinearity mitigation scheme with totally 20 training symbols (TSs) and the proposed PBL-based scheme with only a single TS. Therefore, compared with the conventional TDA scheme, the proposed PBL-based scheme can substantially reduce the required training overhead and hence greatly improve the overall spectral efficiency of bandlimited VLC systems. It is also shown that the PBL-based LED nonlinearity estimation and compensation scheme is computational efficient for the implementation in practical VLC systems.

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40

Song, Dong-Gi, Sungho Choi, Taehyeon Kim, and Kyung-Young Jhang. "Compensation of a Second Harmonic Wave Included in an Incident Ultrasonic Wave for the Precise Measurement of the Acoustic Nonlinearity Parameter." Sensors 21, no. 9 (May 5, 2021): 3203. http://dx.doi.org/10.3390/s21093203.

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The incident second harmonic wave is a problematic issue for the precise measurement of the acoustic nonlinearity parameter. This paper proposes a compensation method to remove the effect of the incident second harmonic component in the measurement of the absolute acoustic nonlinearity parameter using the calibration method. For this, the second harmonic component detected by the receiving transducer is considered as the sum of the component due to material nonlinearity and the component included in the incident signal and a numerical calculation model is developed as a function of the propagation distance. In the model, the factors related to the material nonlinear parameter and the magnitude of the incident second harmonic component are unknown and these are determined by finding a value that best matches the experimental data according to the change in the propagation distance; compensation for the incident second harmonic component is then achieved. The case where the phase of the second harmonic wave due to material nonlinearity is opposite to that of the fundamental wave is also considered. To verify the validity of the proposed method, fused silica and aluminum alloy Al6061-T6 specimens with different thicknesses corresponding to the propagation distance are tested. The experimental results show that the nonlinear parameters changed significantly according to the propagation distance before compensation but were very stable after compensation. Additionally, the average values of the nonlinear parameter are 11.04 in the fused silica, which is within the literature value range (10.1 to 12.4), and that for the Al6061-T6 is 6.59, which is close to the literature value range (4.5 to 6.12).

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41

Zhang, Rui, and Zhi Bin Zeng. "Undersampling Digital Predistortion Compensation Technology Based on Broadband Signals." Applied Mechanics and Materials 543-547 (March 2014): 2381–84. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.2381.

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Nonlinearity of power amplifier always results in spectrum spreading on input signal. When using digital predistortion technology to compensate power amplifier's nonlinearity, the required sampling frenquence for the output signal of amplifier is times of the original signal. The undersampling predistortion method can reduce the sampling frequency requirements. However, for the broadband signal, due to the significant memory effect of the power amplifier, the performance of undersampling digital predistortion is not satisfactory. In order to improve the undesirable predistortion performamce, this paper presents two kinds of undersampling digital predistortion compensation methods. For different sampling frequencies, the predistortion performances of these two kinds of compensation methods are different.

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42

Semrau, Daniel, Domanic Lavery, Lidia Galdino, Robert I. Killey, and Polina Bayvel. "The Impact of Transceiver Noise on Digital Nonlinearity Compensation." Journal of Lightwave Technology 36, no. 3 (February 1, 2018): 695–702. http://dx.doi.org/10.1109/jlt.2017.2777452.

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43

Liu, Ling, Liangchuan Li, Yuanda Huang, Kai Cui, Qianjin Xiong, Fabian N. Hauske, Changsong Xie, and Yi Cai. "Intrachannel Nonlinearity Compensation by Inverse Volterra Series Transfer Function." Journal of Lightwave Technology 30, no. 3 (February 2012): 310–16. http://dx.doi.org/10.1109/jlt.2011.2182038.

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Lee, K. B., and F. Blaabjerg. "A Nonlinearity Compensation Method for a Matrix Converter Drive." IEEE Power Electronics Letters 3, no. 1 (March 2005): 19–23. http://dx.doi.org/10.1109/lpel.2004.842361.

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Friel, G. A., D. M. Hummels, and F. H. Irons. "Measurement and compensation of digital-to-analog converter nonlinearity." Measurement 31, no. 3 (April 2002): 175–86. http://dx.doi.org/10.1016/s0263-2241(01)00030-6.

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Foo, Benjamin, Bill Corcoran, Chen Zhu, and Arthur J. Lowery. "Distributed Nonlinearity Compensation of Dual-Polarization Signals Using Optoelectronics." IEEE Photonics Technology Letters 28, no. 20 (October 15, 2016): 2141–44. http://dx.doi.org/10.1109/lpt.2016.2584105.

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umar, Dr D. V. K. "On-Line Nonlinearity Compensation Technique for PWM Inverter Drives." International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering 3, no. 7 (July 20, 2014): 10766–73. http://dx.doi.org/10.15662/ijareeie.2014.0307071.

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Xie Lianni, 谢连妮, 曹蕾 Cao Lei, 张璐 Zhang Lu, and 余玉揆 Yu Yukui. "Techniques for Kerr Nonlinearity Compensation in Fiber Communication Systems." Laser & Optoelectronics Progress 56, no. 6 (2019): 060002. http://dx.doi.org/10.3788/lop56.060002.

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Tao, Gang, Jason O. Burkholder, and Jiaxing Guo. "Adaptive state feedback actuator nonlinearity compensation for multivariable systems." International Journal of Adaptive Control and Signal Processing 27, no. 1-2 (September 28, 2012): 82–107. http://dx.doi.org/10.1002/acs.2338.

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Hou, Wenmei, and Günter Wilkening. "Investigation and compensation of the nonlinearity of heterodyne interferometers." Precision Engineering 14, no. 2 (April 1992): 91–98. http://dx.doi.org/10.1016/0141-6359(92)90054-z.

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