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Dissertations / Theses on the topic 'Constant Modulus Algorithm'

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Published: 4 June 2021

Last updated: 25 July 2025

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1

Schumacher, Robert G. Jr. "An Efficient FPGA Implementation of a Constant Modulus Algorithm Equalizer for Wireless Telemetry." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1417738709.

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2

Batra, Anuj. "Extensions of the constant modulus algorithm and the phase-locked loop for blind multiuser detection." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/15360.

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3

Luo, Yuhui. "A mixed cross-correlation and constant modulus adaptive algorithm for joint blind equalisation and source separation." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270380.

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4

Taiwo, Peter, and Itie Serge Kone Dossongui. "Towards Real-Time CMA Equalization by using FFT for Signal Blocks transmitted over an Aeronautical channel." International Foundation for Telemetering, 2016. http://hdl.handle.net/10150/624260.

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We consider the problem of equalizing data blocks of signals, which have been transmitted over an aeronautical channel using two different modulation schemes. The equalization is performed using the block-processing constant modulus algorithm (CMA), and in order to achieve real-time processing a Fast Fourier Transform (FFT) is used to compute the gradient of this cost function during equalization. The equalizer length is chosen to be five times of the channel length. For the first experiment, we present the result of equalizing a set of measured data, which was modulated and transmitted u

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5

Jauhar, Ahmad Shujauddin. "A CMA-FRESH Whitening Filter for Blind Interference Rejection." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/85389.

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The advent of spectrum sharing has increased the need for robust interference rejection methods. The Citizens Broadband Radio Service (CBRS) band is soon to be occupied by LTE waveforms and License Assisted Access (LAA) will have LTE signals coexisting with other signals in the 5 GHz band. In anticipation of this need, we present a method for interference rejection of cyclostationary signals, which can also help avoid interference through better detection of low power co-channel signals. The method proposed in this thesis consists of a frequency-shift (FRESH) filter which acts as a whitening

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6

Xingwen, Ding, Zhai Wantao, Chang Hongyu, and Chen Ming. "CMA BLIND EQUALIZER FOR AERONAUTICAL TELEMETRY." International Foundation for Telemetering, 2016. http://hdl.handle.net/10150/624262.

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In aeronautical telemetry, the multipath interference usually causes significant performance degradation. As the bit rate of telemetry systems increases, the impairments of multipath interference are more serious. The constant modulus algorithm (CMA) blind equalizer is effective to mitigate the impairments of multipath interference. The CMA adapts the equalizer coefficients to minimize the deviation of the signal envelope from a constant level. This paper presents the performances of the CMA blind equalizer applied for PCM-FM, PCM-BPSK, SOQPSK-TG and ARTM CPM in aeronautical telemetry.

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Filho, João Mendes. "Algoritmos eficientes para equalização autodidata de sinais QAM." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/3/3142/tde-15032012-122010/.

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Neste trabalho, são propostos e analisados algoritmos autodidatas eficientes para a equalização de canais de comunicação, considerando a transmissão de sinais QAM (quadrature amplitude modulation). Suas funções de erro são construídas de forma a fazer com que o erro de estimação seja igual a zero nas coordenadas dos símbolos da constelação. Essa característica os possibilita ter um desempenho similar ao de um algoritmo de equalização supervisionada como o NLMS (normalized least mean-square), independentemente da ordem da constelação QAM. Verifica-se analiticamente que, sob certas condições fav

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8

Fernandes, Carlos Alexandre Rolim. "EqualizaÃÃo adaptativa e autodidata de canais lineares e nÃo-lineares utilizando o algoritmo do mÃdulo constante." Universidade Federal do CearÃ, 2005. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=2041.

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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico<br>Este trabalho trata da proposiÃÃo de algoritmos para equalizaÃÃo cega de canais lineares e nÃao-lineares inspirados no Algoritmo do MÃdulo Constante (CMA). O CMA funciona de maneira bastante eficiente com constelaÃÃes nas quais todos os pontos possuem a mesma amplitude, como em modulaÃÃes do tipo Phase Shift Keying (PSK). Entretanto, quando os pontos da constelaÃÃo podem assumir diferentes valores de amplitudes, como em modulaÃÃes do tipo Quadrature Amplitude Modulation (QAM), o CMA e seus derivados muitas vezes nÃo funcionam de

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9

Santos, Samuel Batista dos. "Estudo de algoritmos adaptativos aplicados a redes de sensores sem fio : caso supervisionado e não supervisionado." reponame:Repositório Institucional da UFABC, 2014.

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Orientadora: Profa. Dra. Aline de Oliveira Neves Panazio<br>Dissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Engenharia da Informação, 2014.<br>Redes de sensores sem o (WSN - Wireless Sensor Networks) têm sido usadas na observação de fenômenos, identicação de sistemas, equalização de canais, além de aplicações nas mais diversas áreas. Considerando o caso de redes homogêneas com protocolo ponto a ponto, nas quais os sensores são capazes de processar suas informações e se comunicar com sensores vizinhos, diversos algoritmos adaptativos vêm sendo aplicados no pro

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10

Silva, Daniela Brasil. "Restauração cega de imagens: soluções baseadas em algoritmos adaptativos." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3142/tde-27082018-143938/.

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O objetivo da desconvolução cega de imagens é restaurar uma imagem degradada sem usar informação da imagem real ou da função de degradação. O mapeamento dos níveis de cinza de uma imagem em um sinal de comunicação possibilita o uso de técnicas de equalização cega de canais para a restauração de imagens. Neste trabalho, propõe-se o uso de um esquema para desconvolução cega de imagens baseado na combinação convexa de um equalizador cego com um equalizador no modo de decisão direta. A combinação também é adaptada de forma cega, o que possibilita o chaveamento automático entre os filtros component

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11

Assis, Fábio Ferreira de. "Algoritmos set-membership para equalização autodidata aplicados a redes de sensores sem fio." reponame:Repositório Institucional da UFABC, 2018.

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Orientadora: Profa. Dra. Aline de Oliveira Neves Panazio<br>Dissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Engenharia da Informação, Santo André, 2018.<br>Este trabalho dedica-se ao estudo de algoritmos de filtragem adaptativa autodidata no modo difusão, com aplicações em redes de sensores sem fio (RSSF). No modo difusão, os nós sensores da rede possuem poder de processamento local e trocam informações com seus vizinhos. Neste trabalho, propomos dois algoritmos utilizando como base o algoritmo CMA no modo Difusão (CMAD), com duas abordagens distintas da técn

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12

Dabeer, Onkar. "Convergence analysis of the LMS and the constant modulus algorithms /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2002. http://wwwlib.umi.com/cr/ucsd/fullcit?p3055781.

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13

Neville, Katrina Lee, and katrina neville@rmit edu au. "Channel Compensation for Speaker Recognition Systems." RMIT University. Electrical and Computer Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080514.093453.

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This thesis attempts to address the problem of how best to remedy different types of channel distortions on speech when that speech is to be used in automatic speaker recognition and verification systems. Automatic speaker recognition is when a person's voice is analysed by a machine and the person's identity is worked out by the comparison of speech features to a known set of speech features. Automatic speaker verification is when a person claims an identity and the machine determines if that claimed identity is correct or whether that person is an impostor. Channel distortion occurs wh

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14

Al-Hasani, Firas Ali Jawad. "Multiple Constant Multiplication Optimization Using Common Subexpression Elimination and Redundant Numbers." Thesis, University of Canterbury. Electrical and Computer Engineering, 2014. http://hdl.handle.net/10092/9054.

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The multiple constant multiplication (MCM) operation is a fundamental operation in digital signal processing (DSP) and digital image processing (DIP). Examples of the MCM are in finite impulse response (FIR) and infinite impulse response (IIR) filters, matrix multiplication, and transforms. The aim of this work is minimizing the complexity of the MCM operation using common subexpression elimination (CSE) technique and redundant number representations. The CSE technique searches and eliminates common digit patterns (subexpressions) among MCM coefficients. More common subexpressions can be found

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15

Vestin, Albin, and Gustav Strandberg. "Evaluation of Target Tracking Using Multiple Sensors and Non-Causal Algorithms." Thesis, Linköpings universitet, Reglerteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-160020.

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Today, the main research field for the automotive industry is to find solutions for active safety. In order to perceive the surrounding environment, tracking nearby traffic objects plays an important role. Validation of the tracking performance is often done in staged traffic scenarios, where additional sensors, mounted on the vehicles, are used to obtain their true positions and velocities. The difficulty of evaluating the tracking performance complicates its development. An alternative approach studied in this thesis, is to record sequences and use non-causal algorithms, such as smoothing, i

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16

De, Villiers Johan Pieter. "Blind multi-user cancellation using the constant modulus algorithm." Diss., 2003. http://hdl.handle.net/2263/28080.

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Please read the abstract in the section 00front of this document<br>Dissertation (M Eng (Electronic Engineering))--University of Pretoria, 2006.<br>Electrical, Electronic and Computer Engineering<br>unrestricted

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17

Chen, Tsan-Lin, and 陳燦琳. "Blind Equalization Using Constant Modulus Algorithm for Cable DVB System." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/99135981610746576622.

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碩士<br>國立交通大學<br>電子工程系<br>90<br>Blind equalizers have long been employed to recover the distorted signal over ISI channel with AWGN noise. Among the many blind algorithms, constant modulus algorithm (CMA) is the most frequently employed adaptation algorithm in blind equalizers. In this thesis, we consider the applicability of such equalizers to the EN300429 DVB system using QAM modulation technique. Specifically, the effects of several algorithms for blind equalization are discussed and compared. Computer simulation results indicate that the performances of blind equalizers using SGA

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Wang, Hong-Bin, and 王宏彬. "A 5Gb/s Blind Feed-Forward Equalizer Based on Constant Modulus Algorithm." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/73544624038699329284.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>101<br>In high-speed wireline communications, to reduce frequency-dependent channel loss is an important issue. The equalizer is an effective solution to resolve the frequency- dependent signal attenuation. This thesis proposed an on-chip constant-modulus-algorithm (CMA) -based Feed-Forward equalizer (FFE) to overcome this problem. Since CMA is a blind equalization method that does not need training sequence, the adaptive mechanism can be completely implemented on chip. This thesis proposed a constant-modulus-algorithm-based Feed-Forward equalizer that compensates th

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19

Yang, Yu-Sheng, and 楊育盛. "A 3.125 Gb/s Blind Decision Feedback Equalizer Based on Constant Modulus Algorithm." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/06138478603911017218.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>101<br>In high speed wireline communications, the frequency-dependent channel loss is an important issue. The equalizer is an effective method to resolve the frequency- dependent signal attenuation problem in wireline communications. This thesis realizes an on-chip constant-modulus-algorithm(CMA)-based decision feedback equalizer (DFE) to overcome the problem. The CMA is a blind equalization method, so it does not need a training sequence. Thus, the adaptive mechanism can be completely implemented on chip. The wireline we consider in this thesis is the RG58A/U coaxi

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20

Chung, Jen-hao, and 鍾仁豪. "A 5 Gb/s Blind Feed-Forward Equalizer Based on the Constant Modulus Algorithm." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/24338108735124171964.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>102<br>In high-speed wireline communications, to reduce frequency-dependent channel loss is an important issue. The equalizer is an effective solution to resolve the frequency- dependent signal attenuation. This thesis proposed an on-chip constant-modulus-algorithm (CMA) -based Feed-Forward equalizer (FFE) to overcome this problem. Since CMA is a blind equalization method that does not need training sequence, the adaptive mechanism can be completely implemented on chip. This thesis proposed the constant-modulus-algorithm-based Feed-Forward equalizer that compensates

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21

Liu, Hsiao-Chen, and 劉肖真. "Wavelet-Based Multiuser MC-CDMA Receiver with Linearly Constrained Constant Modulus Inverse QRD-RLS Algorithm." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/96196497378870289632.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>90<br>In this thesis, the problem of multiple access interference (MAI) suppression for the multi-carrier (MC) code division multiple access (CDMA) system, based on the wavelet-based (WB) multi-carrier modulation, associated with the combining process is investigated for Rayleigh fading channel. The main concern of this thesis is to derive a new scheme, based on the linearly constrained constant modulus (LCCM) criterion with the robust inverse QR decomposition (IQRD) recursive least squares (RLS) algorithm to improve the performance of the conventional MC-CDMA syst

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22

Yu, Chih-Kai, and 游智凱. "Estimation of Four Transmitting Antennas Space-Time Block Code by Modified Constant Modulus Algorithm (MCMA)." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/70276974012202400689.

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碩士<br>中原大學<br>電子工程研究所<br>98<br>Twin-QPSK is a four transmitting antennas space-time coding system with the features of orthogonal, full diversity, and full code rate. Here, the blind equalization at the receiver is proceeded by using the Modified Constant Modulus Algorithm (MCMA) which can estimate the transmitting signal without the training sequence in the system. The simulation results show that the original transmitted signals can be estimated efficiently. Compared with semi-blind algorithm, this approach not only increases the efficiency of using bandwidth, but also reduces the complexity

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23

Yu, Hung-ming, and 尤宏明. "Linearly Constrained Constant Modulus Inverse QRD-RLS Algorithm for Modified Gaussian Wavelet-Based MC-CDMA Receiver." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/2a3m84.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>95<br>In this thesis, the problem of multiple access interference (MAI) suppression for the multi-carrier (MC) code division multiple access (CDMA) system, based on the multi-carrier modulation with modified Gaussian wavelet, associated with the combining process is investigated for Rayleigh fading channel. The main concern of this thesis is to derive a new scheme, based on the linearly constrained constant modulus (LCCM) criterion with the robust inverse QR decomposition (IQRD) recursive least squares (RLS) algorithm to improve the performance of the wavelet-based

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24

Luo, Yin-chen, and 羅尹辰. "New Blind Constant Modulus Sliding Windows GSC-RLS Algorithm for DS-CDMA Receiver with Min/Max Criterion." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/n3d35d.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>95<br>The code division multiple access (CDMA) system implemented by the direct-sequence (DS) spread spectrum (SS) technique is one of the most promising multiplexing technologies for the wireless communications services. The SS communication adopts a technique of using much wider bandwidth necessary to transmit the information over the channel, and has been proposed for third generation broadband wireless access. The capacity and performance of the DS-CDMA system are mainly limited by the multiple access interference (MAI) and the inter-symbol-interference (ISI) c

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25

Cheng, Ming-Kai, and 鄭名凱. "Novel Blind ST-BC MIMO-CDMA Receiver with Adaptive Constant Modulus-GSC-RLS Algorithm in Multipath Channel." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/14565483379461059601.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>97<br>In this thesis, we present a new hybrid pre-coded direct-sequence code division multiple access (DS-CDMA) system framework that use the multiple-input multiple-output (MIMO) antennas along with Alamouti’s space-time block code (ST-BC). In the transmitter, the idea of hybrid pre-coded is exploited. It not only used to counteract the inter-symbol interference (ISI) introduced by the channel fading duo to multipath propagation but also very useful for exacting the phase of channel by appropriate design, which is not adopted in the conventional blind receiver. Un

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26

Wang, Sheng-Meng, and 王勝盟. "Adaptive Linearly Constrained Constant Modulus Conjugate Gradient Algorithm with Applications to Multiuser DS-CDMA Detector for Multipath Fading Channel." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/94377267081327148403.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>91<br>The direct-sequence code division multiple access (DS-CDMA) is one of the significant techniques for wireless communication systems with multiple simultaneous transmissions. The main concern of this thesis is to propose a new linearly constrained constant modulus modified conjugate gradient (LCCM-MCG) adaptive filtering algorithm to deal with problem of channel mismatch associated with the multiple access interference (MAI) in DS-CDMA system over multipath fading channel. In fact, the adaptive filtering algorithm based on the CM criterion is known to be very

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27

Chang, Shih-chi, and 張世奇. "Blind Adaptive DS-CDMA Receivers with Sliding Window Constant Modulus GSC-RLS Algorithm Based on Min/Max Criterion for Time-Variant Channels." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/88347590504212626430.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>94<br>The code division multiple access (CDMA) system implemented by the direct-sequence (DS) spread spectrum (SS) technique is one of the most promising multiplexing technologies for wireless communications services. The SS communication adopts a technique of using much wider bandwidth necessary to transmit the information over the channel. In the DS-CDMA system, due to the inherent structure interference, referred to as the multiple access interference (MAI), the system performance might degrade. Next, for DS-CDMA systems over frequency-selective fading channels,

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28

Wang, Shiue-Ru, and 王學儒. "Channel Tracking in MIMO OFDM Systems by Utilizing Constant Modulus Algorithms." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/37077845311215753094.

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碩士<br>國立中央大學<br>通訊工程研究所<br>97<br>The combination of multiple input and multiple output (MIMO) technology and orthogonal frequency division multiplexing (OFDM) to combat multipath and mobile channels is widely used in wireless communications. For example, in wireless network applications with limited number of pilots, channel tracking is an important scheme to deal with time-varying channels. Here, the Alamouti space-time block code is applied to a two-by-two MIMO OFDM system in which we explore a new channel tracking algorithm that can alternatively operate between the constant modulus algorit

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Samarasinghe, Devanarayanage Pradeepa. "Efficient methodologies for real-time image restoration." Phd thesis, 2011. http://hdl.handle.net/1885/9859.

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In this thesis we investigate the problem of image restoration. The main focus of our research is to come up with novel algorithms and enhance existing techniques in order to deliver efficient and effective methodologies, applicable in real-time image restoration scenarios. Our research starts with a literature review, which identifies the gaps in existing techniques and helps us to come up with a novel classification on image restoration, which integrates and discusses more recent developments in the area of image restoration. With this novel classification, we identified three major areas w

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Wu, Ping-Chen, and 吳品正. "A Constraint-Based Genetic Algorithm for the Scheduling of Module Operations in TFT-LCD Manufacturing." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/73432246267269173416.

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碩士<br>明新科技大學<br>工程管理研究所<br>92<br>This paper develops an operational strategy for the production scheduling of the module factory in thin film transistor liquid crystal display (TFT-LCD) manufacturing, where the module process involves a mass-customized production environment that depends on the availability of the key parts or components. How to meet a variety of designated materials requested by customers and how to cope with the quick response for confirmed orders will gradually become important issues for TFT-LCD industry. Basically, the traditional MRP (Material requirement planning) is su

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