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Dissertations / Theses on the topic 'Adaptive Cancelers'

Author: Grafiati

Published: 4 June 2021

Last updated: 20 February 2023

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1

Mitchell, Daniel Allan. "Interference Mitigation in Radio Astronomy." Thesis, The University of Sydney, 2004. http://hdl.handle.net/2123/693.

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This thesis investigates techniques and algorithms for mitigating radio frequency interference (RFI) affecting radio astronomy observations. In the past radio astronomy has generally been performed in radio-quiet geographical locations and unused parts of the radio spectrum, including small protected frequency bands. The increasing use of the entire spectrum and global transmitters such as satellites are forcing the astronomy community to begin implementing active interference cancelling. The amount of harmful interference affecting observations will also increase as future instruments such as

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Mitchell, Daniel Allan. "Interference Mitigation in Radio Astronomy." University of Sydney. Physics, 2004. http://hdl.handle.net/2123/693.

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This thesis investigates techniques and algorithms for mitigating radio frequency interference (RFI) affecting radio astronomy observations. In the past radio astronomy has generally been performed in radio-quiet geographical locations and unused parts of the radio spectrum, including small protected frequency bands. The increasing use of the entire spectrum and global transmitters such as satellites are forcing the astronomy community to begin implementing active interference cancelling. The amount of harmful interference affecting observations will also increase as future instruments such as

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3

Picciolo, Michael L. "Robust Adaptive Signal Processors." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/26993.

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Standard open loop linear adaptive signal processing algorithms derived from the least squares minimization criterion require estimates of the N-dimensional input interference and noise statistics. Often, estimated statistics are biased by contaminant data (such as outliers and non-stationary data) that do not fit the dominant distribution, which is often modeled as Gaussian. In particular, convergence of sample covariance matrices used in block processed adaptive algorithms, such as the Sample Matrix Inversion (SMI) algorithm, are known to be affected significantly by outliers, causing undu

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Zerguine, Azzedine. "Algorithms and structures for long adaptive echo cancellers." Thesis, Loughborough University, 1996. https://dspace.lboro.ac.uk/2134/22076.

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The main theme of this thesis is adaptive echo cancellation. Two novel independent approaches are proposed for the design of long echo cancellers with improved performance. In the first approach, we present a novel structure for bulk delay estimation in long echo cancellers which considerably reduces the amount of excess error. The miscalculation of the delay between the near-end and the far-end sections is one of the main causes of this excess error. Two analyses, based on the Least Mean Squares (LMS) algorithm, are presented where certain shapes for the transitions between the end of the nea

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5

Sankaran, Sundar G. "Implementation and evaluation of echo cancellation algorithms." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-02132009-172004/.

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6

Campbell, David Kemp. "Adaptive Beamforming Using a Microphone Array for Hands-Free Telephony." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/31294.

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This thesis describes the design and implementation of a 4-channel microphone array that is an adaptive beamformer used for hands-free telephony in a noisy environment. The microphone signals are amplified, then sent to an A/D converter. The microprocessor board takes the data from the 4 channels and utilizes digital signal processing to determine the direction-of-arrival of the sources and create an output which 'steers' the microphone array to the desired look direction while trying to minimize the energy of interference sources and noise. All of the processing for this thesis will be don

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7

Mackey, Richard Paul. "An asynchronous, single-chip, LMS based, adaptive fir echo canceller." Thesis, The University of Arizona, 1995. http://hdl.handle.net/10150/291387.

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An asynchronous, single-chip, high-speed communication adaptive echo canceller was developed during this research. Adaptation is based on the LMS algorithm with power-of-two convergence factor. Cancellation is performed by a 128-coefficient adaptive finite impulse response filter whose coefficients are updated every cycle. The LMS power-of-two update equations were modified to allow a pipelined implementation. Pipelining the adaptation and echo estimation operations enabled hardware minimization, a high sampling rate, and no increase in convergence time. The resulting circuit updates the filte

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Yamazaki, Ken Carleton University Dissertation Engineering Electrical. "Convergence behaviour of a jointly-adaptive transversal and memory- based echo canceller." Ottawa, 1989.

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9

Brophy, Sean G. (Sean Gregory) Carleton University Dissertation Engineering Electrical. "Synchronization and its effect on adaptive echo canceller performance in the digital subscriber loop environment." Ottawa, 1985.

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10

Karim, Md Anisul. "Weighted layered space-time code with iterative detection and decoding." Thesis, The University of Sydney, 2006. http://hdl.handle.net/2123/1095.

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Multiple antenna systems are an appealing candidate for emerging fourth-generation wireless networks due to its potential to exploit space diversity for increasing conveyed throughput without wasting bandwidth and power resources. Particularly, layered space-time architecture (LST) proposed by Foschini, is a technique to achieve a significant fraction of the theoretical capacity with a reasonable implementation complexity. There has been a great deal of challenges in the detection of space-time signal; especially to design a low-complexity detector, which can efficiently remove multi-layer in

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11

Karim, Md Anisul. "Weighted layered space-time code with iterative detection and decoding." School of Electrical & Information Engineering, 2006. http://hdl.handle.net/2123/1095.

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Master of Engineering (Research)<br>Multiple antenna systems are an appealing candidate for emerging fourth-generation wireless networks due to its potential to exploit space diversity for increasing conveyed throughput without wasting bandwidth and power resources. Particularly, layered space-time architecture (LST) proposed by Foschini, is a technique to achieve a significant fraction of the theoretical capacity with a reasonable implementation complexity. There has been a great deal of challenges in the detection of space-time signal; especially to design a low-complexity detector, which c

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12

Ahmed, Mamun. "Adaptive Sub band GSC Beam forming using Linear Microphone-Array for Noise Reduction/Speech Enhancement." Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-6174.

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This project presents the description, design and the implementation of a 4-channel microphone array that is an adaptive sub-band generalized side lobe canceller (GSC) beam former uses for video conferencing, hands-free telephony etc, in a noisy environment for speech enhancement as well as noise suppression. The side lobe canceller evaluated with both Least Mean Square (LMS) and Normalized Least Mean Square (NLMS) adaptation. A testing structure is presented; which involves a linear 4-microphone array connected to collect the data. Tests were done using one target signal source and one noise

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13

Gao, Ying. "A Digital Signal Processing Approach for Affective Sensing of a Computer User through Pupil Diameter Monitoring." FIU Digital Commons, 2009. http://digitalcommons.fiu.edu/etd/132.

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Recent research has indicated that the pupil diameter (PD) in humans varies with their affective states. However, this signal has not been fully investigated for affective sensing purposes in human-computer interaction systems. This may be due to the dominant separate effect of the pupillary light reflex (PLR), which shrinks the pupil when light intensity increases. In this dissertation, an adaptive interference canceller (AIC) system using the H∞ time-varying (HITV) adaptive algorithm was developed to minimize the impact of the PLR on the measured pupil diameter signal. The modified pupil dia

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14

謝忠文. "Modular Adaptive Filter Design and Implementation of Ghost Canceler." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/42061718035590016898.

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15

尤閔生. "The Study of Adaptive Digital Array Noise Canceller." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/15875441277364341617.

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碩士<br>逢甲大學<br>電機工程研究所<br>86<br>Active control of a single channel system produces only a zone of quit around the monitor microphone. For noise cancellation of a large space, the multichannel system is needed. Hence, in this research, we intend to use the array of microphones and loudspeakers to generate zones of quite. 　　The performance of the single channel system has a great influence on the multichannel because the multichannel channel system is an extension of the single channel system. Usually time-domain filtered-x LMS algorithm in the single channel system does not have good perform ace

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"Mixed-Mode Adaptive Ripple Canceller for Switching Regulators." Master's thesis, 2016. http://hdl.handle.net/2286/R.I.40787.

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abstract: State of art modern System-On-Chip architectures often require very low noise supplies without overhead on high efficiencies. Low noise supplies are especially important in noise sensitive analog blocks such as high precision Analog-to-Digital Converters, Phase Locked Loops etc., and analog signal processing blocks. Switching regulators, while providing high efficiency power conversion suffer from inherent ripple on their output. A typical solution for high efficiency low noise supply is to cascade switching regulators with Low Dropout linear regulators (LDO) which generate inherentl

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17

Cho, Jing Lun, and 卓經綸. "Robust Adaptive Array Beamforming Using Generalized Sidelobe Canceller." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/60007714589817918414.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>90<br>Beamforming technique can suppress interference.But if there are some nonideal situations, beamforming technique can't suppress interference.For example,the antenna location has error, or some near field signals exist. We develop some algorithms to improve the performance of beamforming at steering vector error.In the other words,we develope robust beamforming to degrade the effect of sensor position error and near field signal. We primarily discuss beamforming with GSC architecture.This archite

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Wu, Chau-Ching, and 吳兆鈞. "Design and Implementation of An Asynchronous Adaptive Echo Canceller." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/82328711319766075584.

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碩士<br>國立成功大學<br>電機工程學系<br>86<br>Echo has disturbed us under many conditions for a long time. For example, it might occur in telephone or satellite communication system or in microphone-loudspeaker based system. The appearance of echo in these communication systems will reduce the communication quality and cause the user feel uncomfortable. Thus in this thesis, we developed a LMS algorithm and adaptive filter based asynchronous echo canceller to solve this problem. During the design proced

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19

Huang, Tsung-Wen, and 黃宗文. "The Application of Adaptive Noise Canceller for Hearing Aids." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/56356735592487423206.

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碩士<br>國立成功大學<br>電機工程學系<br>89<br>The structure of traditional hearing aids is relatively simple. They amplify ambient sounds which include speech signal as well as noise. Because noise and human speech signal are amplified at the same time, hearing aid users can’t clearly hear speech signal in noisy environment. By combining adaptive noise canceller and adaptive beamformer, the direction of sound can be used to discriminate speech signal from noise. We have developed a noise cancellation system that based on Griffiths-Jim beamformer. This technique combines NLMS and FLS adaptive algo

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20

Liao, Hui-Hsiung, and 廖輝雄. "Applied Variable Step Size Algorithm to Dual-Adaptive Noise Canceller." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/87802417601173925190.

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碩士<br>龍華科技大學<br>電子系碩士班<br>94<br>The adaptive filter is an important tool in digital signal processing. Depending on the changing of system conditions, an adaptive filter can be designed to estimate the parameters of the system and to adjust accordingly. Because of this advantage and its simplicity, the time-domain adaptive LMS algorithm has attracted a lot of attention and become one of the most widely used techniques in the past decade. However, because its converging speed is slow and there is no generally applicable rule in deciding the step size in each iteration, this technique is not ver

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21

Lin, Chun Fan, and 林俊帆. "Study of Adaptive Nonlinear Echo Canceller Using Layered Bilinear Structure." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/11342798593818400962.

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碩士<br>國立交通大學<br>電子研究所<br>84<br>A nonlinear echo canceller, based on the adaptive two-layer bilinear filter structure, is presented. The computation coeifficients are reduced from a general adaptive layered bilinear filter. Computer simulation results show that our methods can improve the echo cancellation performanceefficiently. The ERLE(echo return loss enhancement) over the adaptive linearecho canceller is 15 dB approximately at SNR=30 dB.

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22

Lee, Yinman, and 李彥文. "Adaptive Decision Feedback Generalized Sidelobe Canceller: Performance Analysis and Applications." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/18174633789388170975.

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博士<br>國立交通大學<br>電信工程系所<br>94<br>The adaptive generalized sidelobe canceller (GSC) is a commonly used device for interference cancellation in array beamforming. However, due to its inherent structure, its convergence is slow. Also, it is sensitive to model mismatch. When model mismatch exists, a phenomenon called signal cancellation will occur, and the performance of the adaptive GSC can be seriously affected. These problems limit the use of adaptive GSC in time-variant systems and also complicate real-world implementations. In this dissertation, we propose a new scheme that can effectively sol

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23

Liao, Wei-Shun, and 廖偉舜. "Pulmonary Recording System Using Transform Domain Adaptive Ambient Noise Canceller." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/47440777299792938189.

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碩士<br>國立臺灣大學<br>電機工程學研究所<br>90<br>The recording process of pulmonary sounds is the first and very important step of the researches about pulmonary sounds. The pulmonary sound signal would corrupted by the ambient noise during and the post-process of the pulmonary sound signal would be erroneous because of the ambient noise interference. Therefore, the aim of this research is to develop a pulmonary recording system that could remove the ambient noise recorded in pulmonary sounds effectively. The solution this thesis proposed is to use the structure of transform domain adaptive filter (TDAF) wit

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24

WU, XIAN-HUANG, and 吳先晃. "Adaptive echo canceller for 2-wire full-duplex voiceband data transmission." Thesis, 1986. http://ndltd.ncl.edu.tw/handle/62938755851587401051.

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25

Friedman, Richard M. "A combined channel-modified adaptive array MMSE canceller and viterbi equalizer." Thesis, 2003. http://library1.njit.edu/etd/fromwebvoyage.cfm?id=njit-etd2003-085.

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26

黃志友. "Pre-rake transmit diversity with adaptive interference canceller for CDMA systems." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/42948435169104633091.

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27

Liao, Ching-Wei, and 廖敬瑋. "Robust Adaptive Beamforming Using Modified Generalized Sidelobe Canceller Under Non-ideal Environments." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/12687364340673925278.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>103<br>LCMV (Linearly Constrained Minimum Variance) beamformer is one of the important and basic techniques in the antenna array signal processing. It aims to find the optimal solution for the weight vector by maintaining the desired array response while minimizing the array output power. Thus, the beamformer has a great ability to suppress interference and noise. The GSC (Generalized Sidelobe Canceller) derived from LCMV beamformer provides a simple way for implementing and makes the implementation of the LCMV much more efficient. However, the performance of the af

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Lin, Po-Yi, and 林柏怡. "Robust Adaptive Beamforming using A New Generalized Sidelobe Canceller Under Non-ideal Environment." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/94293961173296280648.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>104<br>Adaptive array beamforming is the technique which can not only extracts signals of interest from specific angles but also suppresses interferences and noise. LCMV(Linearly Constrained Minimum Variance) beamformer and GSC(Generalized Sidelobe Canceller) are the important techniques in the antenna array signal processing which need the direction of the desired signal as a priori information. The main part of this thesis is to modify GSC(Generalized Sidelobe Canceller) and then proposes the NBMGSC (Noise Block Modified Generalized Sidelobe Canceller) by combini

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29

Wei, Fan Yu, and 范育維. "Multitone Modulation Systemswith Interference Canceller or Adaptive Number of Tones in Wireless Channels." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/43529215994034312663.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>90<br>Multi-media communication and high-speed data transmission are parts of the main goals for the development of the third generation wireless communication system. The multi-path fading of the wireless channels would cause severe inter-symbol interference (ISI) for high-speed data transmission and therefore reduce the performance of the communication system. To overcome the ISI problem for the high-speed data transmission, complex channel equalization at receivers is required. An alternative way to overcome the problem is to use multi-carrier modulation scheme. I

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Chen, CHI-HE, and 陳麒合. "Fetal ECG Extraction and Analysis from Composite Maternal ECG using an Adaptive Noise Canceller." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/66112000204508241649.

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碩士<br>亞洲大學<br>生物資訊學系碩士班<br>99<br>Electorcardiography (ECG) is one of the best ways to measure and diagnose abnormal rhythms of the heart. Its noninvasive nature is especially beneficial for diagnosis of fetal heart defects in advance of delivery. However, there is no appropriate method for noninvasively measuring the fetal ECGs. In this study, we propose a method to cancel noise and drifting and further to extract fetal ECG effectively by an adaptive filter from maternal abdomen and thorax ECGs. In addition, an integrated analysis software, Fetal ECG Analysis Environment (FEAE), for fetal ECG

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Yang, Yun-Si, and 楊盷羲. "Porting of FreeRTOS with real-time Adaptive Noise Canceller and Bluetooth Transmission on ARM Cortex M0." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/87870614214021948049.

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碩士<br>東南科技大學<br>電機工程研究所<br>101<br>Considering the rapid arrival of aging population society in Taiwan, the prevalence of the Android platform, and the competitive price of the 32 bits Cortex-M microcontroller by ARM corp., the long-term home-care medical instruments combined with cloud medical services become more and more important in the future. This study adopts a cheap Cortex-M0 microcontroller ($0.5pcs or so for asking price) and uses its embedded ADC to convert two analog input signals, then the digital signals are processed by adaptive noise canceller (ANC). The experiments are arranged

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Jiun, Yang Yu, and 楊渝軍. "Combination of two local adaptive antenna arrayand an array combiner for cochannel interference canceller in DS-SSMA." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/33216798547038398383.

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碩士<br>國立臺灣科技大學<br>電子工程學系<br>84<br>In the realization of code division multiple access based on a spread-spectrum communication system, i.e., spread spec- trum multiple access (SSMA), reduction of cochannel inter- ference is important problem. This paper proposes an adaptive array system which can improve performance by combining two local adaptive antenna arrays and an array output combiner. While one of two local antenna arrays cannot suppress inter- ference sources with arrival angles the

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Yang, Yu-Jun, and 楊渝軍. "Combination of two Local Adaptive Antenna Arrays and An Array Output Combiner for Cochannel Interference Canceller in DS-SSMA System." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/14527691585201697416.

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