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Dissertations / Theses on the topic 'NLSMs'

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Published: 2 June 2025

Last updated: 31 July 2025

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1

Kuhn, Eduardo Vinicius. "Modelagem estocástica do algoritmo NLMS." Florianópolis, SC, 2012. http://repositorio.ufsc.br/xmlui/handle/123456789/99376.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Elétrica.<br>Made available in DSpace on 2013-03-04T19:47:54Z (GMT). No. of bitstreams: 1 313758.pdf: 2236026 bytes, checksum: b96b29cf2037d52a2d1bf72f2088b483 (MD5)<br>Este trabalho de pesquisa trata da modelagem estocástica de algoritmos adaptativos com sinal de entrada normalizado. Particularmente, visa se obter um modelo estocástico mais preciso para o algoritmo NLMS (normalized least-mean-square) do que os até então disponíveis na literatura. O modelo aqui proposto

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Roy, Tamoghna. "BER Modeling for Interference Canceling Adaptive NLMS Equalizer." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/78055.

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Adaptive LMS equalizers are widely used in digital communication systems for their simplicity in implementation. Conventional adaptive filtering theory suggests the upper bound of the performance of such equalizer is determined by the performance of a Wiener filter of the same structure. However, in the presence of a narrowband interferer the performance of the LMS equalizer is better than that of its Wiener counterpart. This phenomenon, termed a non-Wiener effect, has been observed before and substantial work has been done in explaining the underlying reasons. In this work, we focus on the Bi

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3

Ndungu, Edward Nganga. "A stable pre-whitened NLMS algorithm for acoustic echo cancellation." Thesis, Loughborough University, 1997. https://dspace.lboro.ac.uk/2134/14117.

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This thesis is on a new method for improving the convergence speed of the normalised least mean square (NLMS) algorithm when the input is a coloured signal, such as speech, that can be decorrelated using linear prediction. The proposed method gives a significant improvement in the convergence speed and requires very little additional computation in terms of arithmetic operations and memory space. It is also very easy to implement. An important aspect of the proposed method is its inherent stability irrespective of the order of the prediction-error filter or the manner in which it is adapted. T

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4

Sharma, Maneesha. "Channel prediction in MU-MIMO-OFDM downlink system." Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/198037/1/Maneesha_Sharma_Thesis.pdf.

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In multi-user multiple input multiple output orthogonal frequency division multiplexing downlink system, it is important to have an accurate channel state information at the base-station in order to minimize the inter-user interference. However, when the channel changes rapidly, the available channel state information at the base-station can be outdated, causing performance loss. In this research, we propose to use linear adaptive filtering algorithms, such as normalized least mean squares and recursive least squares to predict the channel state information at the base-station to improve the b

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Nguyen, Ngoc Hung, Majid Dowlatnia, and Azhar Sarfraz. "Implementation of the LMS and NLMS algorithms for Acoustic Echo Cancellationin teleconference systemusing MATLAB." Thesis, Växjö University, School of Mathematics and Systems Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-6368.

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<p>In hands-free telephony and in teleconference systems, the main aim is to provide agood free voice quality when two or more people communicate from different places.The problem often arises during the conversation is the creation of acoustic echo. Thisproblem will cause the bad quality of voice signal and thus talkers could not hearclearly the content of the conversation, even thought lost the important information.This acoustic echo is actually the noise which is created by the reflection of soundwaves by the wall of the room and the other things exist in the room. The mainobjective for en

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6

Dahlberg, Anders. "Evaluation of a Floating Point Acoustic Echo Canceller Implementation." Thesis, Linköping University, Department of Electrical Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8938.

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<p>This master thesis consists of implementation and evaluation of an AEC, Acoustic Echo Canceller, algorithm in a floating-point architecture. The most important question this thesis will try to answer is to determine benefits or drawbacks of using a floating-point architecture, relative a fixed-point architecture, to do AEC. In a telephony system there is two common forms of echo, line echo and acoustic echo. Acoustic echo is introduced by sound emanating from a loudspeaker, e.g. in a handsfree or speakerphone, being picked up by a microphone and then sent back to the source. The problem wit

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7

MONTAZERI, MOHSEN. "Une famille d'algorithmes adaptatifs comprenant les algorithmes nlms et rls application a l'annulation d'echo acoustique." Paris 11, 1994. http://www.theses.fr/1994PA112282.

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L'annulation d'echo acoustique pour les communications avec les postes mains-libres est une application typique du filtrage adaptatif. Cette application pose un probleme difficile, car a contraintes contradictoires, pour lequel on cherche encore une solution satisfaisante. L'objectif vise dans ce travail est donc de developper des algorithmes adaptatifs efficaces dans ce contexte. D'une nouvelle maniere, c'est-a-dire a partir d'une propriete commune entre l'algorithme nlms et l'algorithme rls par bloc a fenetre rectangulaire ou la taille du bloc et la taille de la fenetre sont egales a celle d

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Raghavendran, Srinivasaprasath. "Implementation of an Acoustic Echo Canceller Using Matlab." [Tampa, Fla.] : University of South Florida, 2003. http://purl.fcla.edu/fcla/etd/SFE0000169.

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9

FURTADO, Vagner Guidotti. "Circuitos divisores Newton-Raphson e Goldschmidt otimizados para filtro adaptativo NLMS aplicado no cancelamento de interferência." Universidade Catolica de Pelotas, 2017. http://tede.ucpel.edu.br:8080/jspui/handle/jspui/693.

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Submitted by Cristiane Chim (cristiane.chim@ucpel.edu.br) on 2018-05-08T17:34:22Z No. of bitstreams: 1 Vagner Guidotti Furtado (1).pdf: 2942442 bytes, checksum: a43c18ecb28456284d4b6c622f11210d (MD5)<br>Made available in DSpace on 2018-05-08T17:34:22Z (GMT). No. of bitstreams: 1 Vagner Guidotti Furtado (1).pdf: 2942442 bytes, checksum: a43c18ecb28456284d4b6c622f11210d (MD5) Previous issue date: 2017-12-07<br>The division operation in digital systems has its relevance because it is a necessary function in several applications, such as general purpose processors, digital signal processors and

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Ikuma, Takeshi. "Non-Wiener Effects in Narrowband Interference Mitigation Using Adaptive Transversal Equalizers." Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/26772.

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The least mean square (LMS) algorithm is widely expected to operate near the corresponding Wiener filter solution. An exception to this popular perception occurs when the algorithm is used to adapt a transversal equalizer in the presence of additive narrowband interference. The steady-state LMS equalizer behavior does not correspond to that of the fixed Wiener equalizer: the mean of its weights is different from the Wiener weights, and its mean squared error (MSE) performance may be significantly better than the Wiener performance. The contributions of this study serve to better understand thi

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Silva, Wilander Testone Pereira da. "Modelagem Estocástica: Teoria, Formulação e Aplicações do Algoritmo LMS." Universidade Federal do Maranhão, 2016. http://tedebc.ufma.br:8080/jspui/handle/tede/301.

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Made available in DSpace on 2016-08-17T14:52:41Z (GMT). No. of bitstreams: 1 Dissertacao-WilanderTestonePereiraSilva.pdf: 3903191 bytes, checksum: b91ff906a27937df64d75b330c6ea137 (MD5) Previous issue date: 2016-03-11<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>In this dissertation we present a research in aspects of stochastic modeling, convergence and applications of least mean square (LMS) algorithm, normalized least mean square (NLMS) algorithm and proportionate normalized least mean square (PNLMS) algorithm. Specifically, the aim is to address the LMS algorithm i

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12

Deyneka, Alexander. "Metody ekvalizace v digitálních komunikačních systémech." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-218963.

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Tato práce je psaná v angličtině a je zaměřená na problematiku ekvalizace v digitálních komunikačních systémech. Teoretická část zahrnuje stručné pozorování různých způsobů návrhu ekvalizérů. Praktická část se zabývá implementací nejčastěji používaných ekvalizérů a s jejich adaptačními algoritmy. Cílem praktické části je porovnat jejich charakteristiky a odhalit činitele, které ovlivňují kvalitu ekvalizace. V rámci problematiky ekvalizace jsou prozkoumány tři typy ekvalizérů. Lineární ekvalizér, ekvalizér se zpětnou vazbou a ML (Maximum likelihood) ekvalizér. Každý ekvalizér byl testován na mo

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Forsgren, Fredrik. "Active Noise Control in Forest Machines." Thesis, Umeå universitet, Institutionen för fysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-48661.

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Achieving a low noise level is of great interest to the forest machine industry. Traditionally this is obtained by using passive noise reduction, i.e. by using materials for sound isolation and sound absorption. Especially designs to attenuate low frequency noise tend to be bulky and impractical from an installation point of view. An alternative solution to the problem is to use active noise control (ANC). The basic principle of ANC is to generate an anti-noise signal designed to destructively interfere with the unwanted noise. In this thesis two algorithms (Feedback FxLMS and Feedforward FxLM

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14

Sklar, Alexander Gabriel. "Channel Modeling Applied to Robust Automatic Speech Recognition." Scholarly Repository, 2007. http://scholarlyrepository.miami.edu/oa_theses/87.

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In automatic speech recognition systems (ASRs), training is a critical phase to the system?s success. Communication media, either analog (such as analog landline phones) or digital (VoIP) distort the speaker?s speech signal often in very complex ways: linear distortion occurs in all channels, either in the magnitude or phase spectrum. Non-linear but time-invariant distortion will always appear in all real systems. In digital systems we also have network effects which will produce packet losses and delays and repeated packets. Finally, one cannot really assert what path a signal will take, and

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15

Wu, Une Chung, and 吳遠全. "Acoustic fast equivalent NLMS echo cancellation in subband." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/71631926213267545546.

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碩士<br>國立交通大學<br>電信工程研究所<br>86<br>Abstract: Thousands of tap weights of an adaptive FIR echo canceller usually results in slow convergence speed and high computational complexity. In thisthesis, a fast equivalent NLMS (FENLMS) algorithm is proposed which has lower computational complexity and similar convergence characteristic as compared tothe NLMS algorithm. For speech signal, another decorrelation FENLMS (DFENLMS) algorithm is proposed to improve the performance of the FENLMS algorithm.Ad

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16

Chen, Jun Ming, and 陳俊銘. "Step-Size Adjustments of NLMS Algorithm for Acoustic Echo Cancellation." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/9532hj.

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碩士<br>國立交通大學<br>電信工程系所<br>92<br>The most often used algorithm for acoustic echo cancellation is normalized least mean square (NLMS) algorithm due to its simplicity and robustness. However, the major drawback of NLMS algorithm is its slow convergence rate due to its constant step-size. We propose a new approach of adjusting step-size called optimum step-size NLMS. The word “optimum” means the step-size can provide the minimum tap coefficient error mean square error at each iteration step which leads the fastest convergence rate than other algorithms. Each tap has its individual time-variant ste

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17

Chou, Mu-Xuan, and 周睦軒. "Adapt feedback noise cancellation to hearing aid by NLMS algorithm." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/83f62t.

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碩士<br>國立陽明大學<br>醫學工程研究所<br>97<br>Feedback is one of the most frequent complaints of hearing aid users. Feedback and the occlusion effect pose great challenges for hearing aid design and usage. However, conventional solutions for those two problems often face the dilemma. In this research will discuss some advanced signal processing strategies of the feedback cancellation and the occlusion effect reduction. The strategies currently used to reduce feedback (i.e.,adaptive feedback reduction algorithms using adaptive gain reduction, notch filtering, and phase cancellation strategies). The adap

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Chou, Kui-Shun, and 周奎勳. "Improved Partial Update NLMS Algorithm for Sparse Impulse Response Identification." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/19963982759971849434.

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19

Tsai, Shang-Ching, and 蔡尚慶. "Echo Cancellation with Subband NLMS Algorithm Based on Wavelet Packets." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/06119454610109686046.

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碩士<br>國立交通大學<br>電信研究所<br>85<br>The normalized LMS is widely used because of its simplicity. However, the algorithm behaves unstably when all elements of an input vector is very small with respect to noise power. Coefficients of the adaptive filter are not updated when a norm of an input vector is smaller than a threshold. But we proposed an improved method that coefficients are updated by a smaller stepsize if this condition

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20

GUNE, SHREYAS. "CALCULATION OF PSDF USING SIXTH ORDER ADAPTIVE FILTER." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15522.

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In this thesis, ground motion has been modeled as IIR sixth order adaptive filter. Three IIR filter models have been compared for various earthquakes. White noise input is given to the filter and the filter coefficients, initialized as zero are adapted such that the output is equal to the desired earthquake. Further, three adaptive algorithms, namely, standard least mean square (LMS) algorithm, normalized least mean square(NLMS) algorithm and LMS algorithm with different coefficients for forward and feedback loop have been used in this research. Acceleration time history graphs for different

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GUNE, SHREYAS. "CALCULATION OF PSDF USING SIXTH ORDER ADAPTIVE FILTER." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14704.

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In this thesis, ground motion has been modeled as IIR sixth order adaptive filter. Three IIR filter models have been compared for various earthquakes. White noise input is given to the filter and the filter coefficients, initialized as zero are adapted such that the output is equal to the desired earthquake. Further, three adaptive algorithms, namely, standard least mean square (LMS) algorithm, normalized least mean square(NLMS) algorithm and LMS algorithm with different coefficients for forward and feedback loop have been used in this research. Acceleration time history graphs for different

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22

Chiang, Tsung-Yao, and 江宗堯. "Subband Adaptive Filtering with Variable Step-Size NLMS for Echo Cancelation." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/85428246882176027903.

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碩士<br>國立交通大學<br>電機與控制工程系所<br>96<br>In this thesis, we consider the problem of acoustic echo cancelation for a time varying environment. In the context of adaptive filtering, the subband adaptive filtering (SAF) is known to enjoy a fast convergence rate. By applying adaptive filtering in the subbands, it also has the advantage of a lower complexity. On the other hand, the normalized least mean squares (NLMS) algorithm with a variable step size (VSS)is known to have a good tracking ability in a time varying environment. However the implementation of VSS-NLMS is usually computationally expensi

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Wei-Cheng, Sun, and 孫偉誠. "Application of an Integrator prior to the NLMS algorithm for speech noise reduction." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/23409169106984900368.

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碩士<br>高苑科技大學<br>電子工程研究所<br>97<br>In this study, a signal pre-processing technique for NLMS algorithm is developed for reducing the noise in speech signal. Two microphones, installed in parallel with a distance of 4 cm in the front panel of a mobile phone, are utilized to collect raw signals of speech. One of the raw signal, saying S1, is directly used as the contaminated speech signal for NLMS. As for the reference noise for NLMS, it is obtained by integrating the difference of the two signals, saying (S1-S2). This technique is the main contribution in this study. Five different types of

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Hwang, Chien-Hsin, and 黃謙信. "The Transient Analysis of the Variable Step Size and the Variable Regularization NLMS Algorithm." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/343q8n.

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碩士<br>元智大學<br>電機工程學系<br>105<br>In this paper, we doing the transient analysis of two proposed adaptive algorithm for digital filters. One is the particular variable step size-NLMS(VSS-NLMS) algorithm , another is the particular variable regularization-NLMS(VR-NLMS). We refer to the process of the NLMS’s transient analysis in the reference, and use some approximate assumption to help derive the transient analysis of the two algorithm. Finally, we absolute the goodness of fit by using the computer simulation.

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Chen, Jia-Wei, and 陳家緯. "A new convergence statistic indicator and the application of variable step-size NLMS algorithm." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/94578636478825910145.

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碩士<br>元智大學<br>電機工程學系<br>99<br>Variable step-size algorithm may along with time change the step-size parameter, increase filter’s convergence performance, but make a lot of trouble to set the parameters. In this paper, we proposed a new convergence statistic indicator and the application of variable step-size NLMS algorithm, and with the NLMS algorithm and other scholars proposed non parametric variable step-size NLMS algorithm on simulations, and then analyzes how to select the appropriate threshold of convergence statistical indicators, in order to have both fast convergence and good steady-s

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Bhotto, Md Zulfiquar Ali. "Improved robust adaptive-filtering algorithms." Thesis, 2011. http://hdl.handle.net/1828/3791.

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New adaptive-filtering algorithms, also known as adaptation algorithms, are proposed. The new algorithms can be broadly classified into two categories, namely, steepest-descent and Newton-type adaptation algorithms. Several new methods have been used to bring about improvements regarding the speed of convergence, steady-state misalignment, robustness with respect to impulsive noise, re-adaptation capability, and computational load of the proposed algorithms. In chapters 2, 3, and 8, several adaptation algorithms are developed that belong to the steepest-descent family. The algori

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Wang, Qing-Xuan, and 王清玄. "Optimal Variable Step-Size NLMS Algorithms for Online Secondary Path Modeling in Active Noise Control Systems." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/66743727583779293825.

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碩士<br>國立中興大學<br>機械工程學系所<br>100<br>The practical application of active noise control system, using the FxLMS algorithms need to get the transfer function of the secondary path. In the past the second path transfer function is mostly obtained from an off-line identification, but taking into account the system has the change situation occurrence, the transfer function of the secondary path which the off-line identification obtain can become inaccurate. Therefore require the development of online secondary path modeling methods to solve this problem. This study proposes a new online secondary path

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28

Yang, Yung-Ning, and 楊詠甯. "A New Double-Talk Detection Using Square-Error-Based Regularization NLMS Algorithm For Acoustic Echo Cancellation." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/22713058231971175644.

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碩士<br>元智大學<br>電機工程學系<br>96<br>The main purpose of this thesis is to study the double-talk detection of the acoustic echo cancellation. We use the frame of the two-path echo cancellation which is combined with cross-correlation method to be our double-talk detection. The detector can actually differentiate between echo and near-end speech. We introduce the square-error-based regularization NLMS algorithm acoustic echo cancellation method with double-talk detection. A large number of simulations demonstated the usefulness of our sheme.

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29

Kuo, Hung-I., and 郭弘驛. "A Study on the Application of a Fuzzy Variable Step Size Adaptive NLMS Filter to the Noise Cancellation." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/67527507894254783166.

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碩士<br>國立成功大學<br>電機工程學系碩博士班<br>95<br>Adaptive filter algorithms are generally used for the achievement of active noise cancellation. Especially least mean square (LMS) and normalized least mean square (NLMS) are two of the most widely used algorithms. The step size and the power of reference signal in NLMS algorithm are the most critical parameters in adaptive filtering. They govern the convergence speed and the fluctuation of the NLMS adaptation process. Here the step size is decided not only by reference signal but also by convergence factor. Besides, a fixed convergence factor can not respon

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Lo, Yun-Ta, and 羅運達. "Development and Application of Optimal Variable Step-Size NLMS Algorithms in Feedforward Active Noise Control Subject to Disturbance." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/18845319951223551987.

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碩士<br>國立中興大學<br>機械工程學系所<br>100<br>In the application of active noise control (ANC) system, weights update of an adaptive filter will affected by disturbance picked up by the error microphone, leading to the degradation of system performance. In addition, the existing adaptive Variable Step-Size(VSS) algorithms usually have commonly issue in selection of Step-Size function parameters. If the parameter selection is poor, the control performance of the control system will be substantially reduced. However, the selections of parameters are usually only rely on the rule of thumb, leading to the use

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Sequeira, Raquel Lourenço das Neves. "Optimizing nonviral vectors for gene therapy of the retina." Master's thesis, 2020. http://hdl.handle.net/10451/47814.

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Tese de mestrado em Biologia Molecular e Genética, Faculdade de Ciências, Universidade de Lisboa, 2020<br>A terapia génica tem-se revelado como uma abordagem terapêutica promissora pela manipulação de genes (quer por adição génica, quer por silenciamento ou edição de um gene mutante) para tratar doenças genéticas hereditárias, mas também doenças adquiridas ou infeciosas. Para que a terapia génica seja eficiente tem de compreender também uma forma eficiente de entrega do material genético às células alvo. Esta entrega é efetuada com recurso a dois tipos de vetores distintos: vetores virais e ve

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Runov, Boris. "Integrability of Bukhvostov-Lipatov model and ODE/IQFT correspondence." Phd thesis, 2018. http://hdl.handle.net/1885/148417.

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We consider Bukhvostov-Lipatov model, an integrable quantum field theory in two dimensions that arises as an approximation to O(3) NLSM. We compute its vacuum energy on a cylinder with twisted boundary conditions in weak coupling limit using renormalized perturbation theory, and in the short distance limit using conformal perturbation theory. The exact solution of this model via coordinate Bethe ansatz is provided. Two different regularizations of Bethe ansatz equations are constructed. The vacuum state is constructed and the vacuum energy is

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