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A novel approach integrating CFBG and optical filters to mitigate CD and PMD effects in high speed DWDM fiber optic links

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OPTICAL AND QUANTUM ELECTRONICS 2024年第8期56卷 1283-1283页

作者： Sreeragi, G. R. Vijayakumar, N. Pradeep, R. Govt Engn Coll Dept Elect & Commun Barton Hill Thiruvananthapuram 695035 India APJ Abdul Kalam Technol Univ Thiruvananthapuram India Univ Kerala Board Studies Thiruvananthapuram India Coll Engn Dept Elect & Commun Thiruvananthapuram 695016 India

Fiber dispersion is a severe constraint to be addressed in high speed optical communication, as it restricts the transmission capacity and reach of fiber optics link. This work presents an effective dispersion compensation technique in the optical domain with minimal hardware complexity. Here, we integrated a single linearly chirped fiber Bragg grating (CFBG) with tanh apodization for Chromatic Dispersion (CD) compensation and a second-order optical FIR filter for Polarization Mode Dispersion (PMD) compensation. Adaptive PMD compensation is obtained by updating the filter parameters using Least Mean Square (lms) error algorithm, which enables the system to adjust and mitigate PMD effects dynamically, enhancing overall efficiency. The performance of the proposed system with different modulation schemes such as NRZ, RZ, and duo-binary schemes are experimented. A WDM link of 16 channels over 100 km is designed with the proposed model, with each channel transmitting data at 40 Gbps. Simulation results reveal that the presented model performed well with reduced hardware complexity, keeping BER value below 10-9\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$10<^>{-9}$$\end{document} and Q-Factor above 6.

关键词： Bit error rate Chromatic dispersion Fiber bragg grating lms algorithm Optical filters Polarization mode dispersion

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A fast convergence algorithm for echo cancellers in full duplex transmission using back projection from slicer

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 2005年第4期53卷 1534-1549页

作者： Stopler, D Reuven, I Tel Aviv Univ Dept Elect Engn Syst IL-69978 Tel Aviv Israel

The problem of accelerating echo canceller tracking, during full duplex transmission, in single carrier (data) receivers with adaptive equalization is addressed. The scheme presented accelerates the convergence rate by orders of magnitude, with a minor increase in complexity, which can be traded for speed. The complexity may be reduced to a fraction of that of previously published acceleration schemes, while providing substantial speedup factors with respect to conventional echo cancellers. The new scheme is based on measuring the residual echo signal at the slicer (symbol-by-symbol detector) but applying the correction to the conventional echo canceller. Measuring changes in a low-noise (post-slicer) environment enables speedup of the adaptation. Updating the pre-equalizer echo canceller both reduces complexity and distills the echo from the noisy equalizer input.

关键词： adaptive digital filters convergence acceleration digital subscriber line DSL echo echo cancellation fast convergence fast echo canceller fast tracking lms algorithm

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Reference-Free Deterministic Calibration of Pipelined ADC

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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 2015年第2期E98A卷 665-675页

作者： Oshima, Takashi Yamawaki, Taizo Hitachi Ltd Cent Res Lab Kokubunji Tokyo 1858601 Japan

Novel deterministic digital calibration of pipelined ADC has been proposed and analyzed theoretically. Each MDAC is dithered exploiting its inherent redundancy during the calibration. The dither enables fast accurate convergence of calibration without requiring any accurate reference signal and hence with minimum area and power overhead. The proposed calibration can be applied to both the 1.5-bit/stage MDAC and the multi-bit/stage MDAC. Due to its simple structure and algorithm, it can be modified to the background calibration easily. The effectiveness of the proposed calibration has been confirmed by both the extensive simulations and the measurement of the prototype 0.13-mu m-CMOS 50-MS/s pipelined ADC using the op-amps with only 37-dB gain. As expected, SNDR and SFDR have improved from 35.5 dB to 58.1 dB and from 37.4 dB to 70.4 dB, respectively by the proposed calibration.

关键词： deterministic calibration dither lms algorithm pipelined ADC multi-bit/stage MDAC

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Adaptive pose output decoupling for a hydraulically-driven 6-DOF parallel manipulator

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JOURNAL OF VIBRATION AND CONTROL 2011年第9期17卷 1417-1423页

作者： Yao Jianjun Fu Wei Hu Shenghai Harbin Engn Univ Coll Mech & Elect Engn Harbin Peoples R China

Since kinematic and dynamic coupling phenomena occur in a parallel manipulator, the outputs of the system corresponding to a sinusoidal pose contains coupling poses besides the fundamental input, causing coupling pose outputs. The method for pose output decoupling based on adaptive noise cancellation, a method for noise control and vibration control, is proposed here. The task is accomplished by generating a reference signal with the same frequency of the input pose. The reference input is weighted by the least mean square (lms) algorithm in such a way that it closely matches the coupling pose output. The weighted reference signal is added to the fundamental signal such that the coupling pose output is cancelled leaving the desired pose alone. The weights of the lms algorithm are adjusted by the coupling pose output, which is to be cancelled. The system is based on linkspace control, and its pose output is calculated in real-time from the actuator lengths by forward kinematics. The above concept is used as a basis for the development of an adaptive pose output decoupling algorithm. Experimental results performed with a hydraulically driven six degrees-of-freedom parallel manipulator demonstrate the efficiency and validity of the proposed control scheme.

关键词： 6-DOF parallel manipulator adaptive pose output decoupling coupling pose output lms algorithm

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EEG adaptive noise cancellation using information theoretic approach

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BIO-MEDICAL MATERIALS AND ENGINEERING 2017年第4期28卷 325-338页

作者： Darroudi, Ali Parchami, Jaber Razavi, Morteza Kafaee Sarbisheie, Ghazaleh Sadjad Univ Technol Dept Elect Engn Jalal 64 StJalal Blvd Mashhad Iran Sadjad Univ Technol Dept Biomed Engn Mashhad Iran

OBJECTIVE: In this paper, an adaptive method based on error entropy criterion is presented in order to eliminate noise from Electroencephalogram (EEG) signals. METHOD: Conventionally, the Mean-Squared Error (MSE) criterion is the dominant criterion deployed in the adaptive filters for this purpose. By deploying MSE, only second-order moment of the error distribution is optimized, which is not adequate for the noisy EEG signal in which the contaminating noises are typically non-Gaussian. By minimizing error entropy, all moments of the error distribution are minimized;hence, using the Minimum Error Entropy (MEE) algorithm instead of MSE-based adaptive algorithms will improve the performance of noise elimination. RESULTS: Simulation results indicate that the proposed method has a better performance compared to conventional MSE-based algorithm in terms of signal to noise ratio and steady state error.

关键词： Adaptive filtering entropy lms algorithm MEE algorithm noise cancellation

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A New Mixed Variable Step Size Elms algorithm And Its Application in ANC

A New Mixed Variable Step Size ELMS Algorithm And Its Applic...

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2010 Second International Conference on E-Learning, E-Business, Enterprise Information Systems, and E-Government (EEEE 2010)

作者： Sun Li Jun School of Electrical Engineering Henan University of Technology Zhengzhou 450001, China ZHANG Shou_yong, WANG Xiang_li School of Information Science and Engineering Henan University of Technology Zhengzhou 450001, China

In this paper, we proposed a new mixed variable step size Elms algorithm (MVSS-Elms) which combined the mean square error and the correlation of the error to modify the step size. The approach is general in the sense that it not only retains the benefits of Elms algorithm lower steady-state error, but also improves the system convergence speed. In comparison, the new approach performance is much better than VSS-Elms algorithm and VFSS-Elms algorithm in the convergence speed and anti-noise capacity. Effectiveness of the proposed algorithm is demonstrated through computer simulations.

关键词： adaptive filtering noise canceller lms algorithm Elms algorithm

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Development and study of an automatic ac bridge for impedance measurement

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IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 2001年第5期50卷 1048-1052页

作者： Dutta, M Rakshit, A Bhattacharyya, SN Jadavpur Univ Dept Elect Engn Kolkata 700032 W Bengal India

An automatic ac bridge method employing the principle of balancing by means of a stochastic gradient search algorithm is presented. Among the various gradient search techniques, the Widrow-Hoff least mean square (lms) technique has been chosen as it involves a low computational burden. The lms algorithm has been used by the authors for the operation of an ac bridge operating with continuous variables. The relevant operation has been verified by simulation;it can also measure negative impedance. A relation has been established between parameters to be used in the lms algorithm for discrete and continuous versions of the bridge. The balance convergence time for a relatively simple form of the lms bridge, namely, the R-R type bridge, has been theoretically established and experimentally verified both by simulation and real-time implementation. The frequency response of the lms algorithm has also been determined.

关键词： adaptive weight automatic ac bridge convergence factor lms algorithm negative impedance time varying impedance

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A High Q Gm-C Filter with On-Chip Automatic Tuning Circuit Implemented in Nano-Scale CMOS Process

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NANOSCIENCE AND NANOTECHNOLOGY LETTERS 2014年第9期6卷 856-860页

作者： Kuang, Xiao Fei Guo, Chenxu Cheng, Yuhua Wang, Hengyi Hangzhou Dianzi Univ Inst Microelect CAD Hangzhou 310018 Zhejiang Peoples R China

A fourth-order Butterworth band-pass filter whose Q value is greater than 10 implemented in nanoscale CMOS process, is presented. The center frequency can be switched by an external switch. The filter integrates a Q-tuning scheme and a frequency tuning scheme. The Q-tuning scheme has a high accuracy based on the lms algorithm. The basic block OTA in the filter takes advantage of the dynamic source degeneration technique, which could improve the input linearity range. The pass bandwidth is 260 kHz, the adjacent channel rejection is greater than 30 dB, and the max power consumption is only 7.9 mW.

关键词： Gm-C Continuous-Time Filter Q-Tuning Frequency Tuning lms algorithm

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Design and Application of a DSP Controller for Giant Magnetostrictive Smart Structure

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Chinese Journal of Aeronautics 2006年第B12期19卷 220-223页

作者： ZHANG Wen-guang Mao Jian-qin School of Mechanical Engineering and Automation Beijing University of Aeronautics and Astronautics Beijing 100083 China

It is proposed a digital signal processing （DSP） controller used in the control system of six degree-of-freedom （DOF） giant magnetostrictive smart structure （GMSS）. Also are presented the controller design and its implementation, the embedded adaptive least mean-square （lms） control algorithm and the real-time experiments of GMSS. Three programs are embedded in this controller. Of them are the adaptive lms control algorithm and the other two which are used to search for the optimal values for the initial weight vectors. Moreover, the work flow and the control approach of the GMSS with the DSP controller are introduced. The experimental results indicate that the DSP controller has better control precision and real-time property, and the damping effect is up to 20 dB-30 dB.

关键词： GMSS DSP active vibration control lms algorithm

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Blind adaptive channel mismatch equalisation method for GNSS antenna arrays

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IET RADAR SONAR AND NAVIGATION 2018年第4期12卷 383-389页

作者： Lu, Zukun Chen, Huaming Chen, Feiqiang Nie, Junwei Ou, Gang Natl Univ Def Technol Coll Elect Sci 109 Deya Rd Changsha Hunan Peoples R China

A blind adaptive channel mismatch equalisation method for global navigation satellite system (GNSS) antenna arrays is proposed. The anti-jamming performance of the antenna arrays is limited by the channel mismatch that is a relative characteristic of each radio frequency channel but not an absolute non-ideal characteristic. To pre-process the received data in the frequency domain, the least mean square (lms) algorithm is used. The reference signal in lms is the received data in the reference element. The purpose of pre-processing is to make the received data in the other elements approach the reference signal, which, in essence, is to equalise the mismatched channel. Without any auxiliary sensors and calibration source, this method can estimate the channel characteristics relative to the reference elements. Simulations and experimental results show that the proposed method is significant in improving the anti-jamming performance.

关键词： channel estimation blind equalisers adaptive equalisers satellite navigation satellite antennas antenna arrays jamming interference suppression least mean squares methods frequency-domain analysis blind adaptive channel mismatch equalisation method GNSS antenna array Global Navigation Satellite System antijamming performance radiofrequency channel least mean square algorithm lms algorithm frequency domain algorithm auxiliary sensor calibration source channel estimation

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