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Dissertations / Theses on the topic 'ML estimation'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Liu, Kejing, and Michael Rice. "Data Aided ML Symbol Timing Estimation for MIMO Systems Using a Polyphase Filterbank." International Foundation for Telemetering, 2003. http://hdl.handle.net/10150/605379.

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International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>This paper derives the maximum likelihood (ML) symbol timing estimator for a frequency non-selective multiple-input, multiple output (MIMO) channel assuming linear modulation and known data and known channel gains. The non-frequency selective fading assumption means the multipath delay spread is small so that the symbol time delay is the same across all receive antennas. Both a closed-loop and an approximate open-loop architecture are demonstrated. The open-lo

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2

Gomes, Marco Aurelio Cazarotto 1984. "Filtragem otima para melhorar o desempenho de estimadores DOA-ML." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261946.

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Orientador: Amauri Lopes<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação<br>Made available in DSpace on 2018-08-14T21:35:53Z (GMT). No. of bitstreams: 1 Gomes_MarcoAurelioCazarotto_M.pdf: 1012758 bytes, checksum: 0c2ca6c09e4123b277735dca0f50a107 (MD5) Previous issue date: 2009<br>Resumo: Abordamos o problema de estimação de direção de chegada (DOA) de ondas planas usando um arranjo de sensores. Na literatura encontramos diversos estimadores para DOA, porém estamos considerando apenas os estimadores de Máxima Verossimilhança (ML)

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3

Avan, Muhammet. "Joint Frequency Offset And Channel Estimation." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/2/12610149/index.pdf.

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In this thesis study, joint frequency offset and channel estimation methods for single-input single-output (SISO) systems are examined. The performance of maximum likelihood estimate of the parameters are studied for different training sequences. Conventionally training sequences are designed solely for the channel estimation purpose. We present a numerical comparison of different training sequences for the joint estimation problem. The performance comparisons are made in terms of mean square estimation error (MSE) versus SNR and MSE versus the total training energy metrics. A novel estimation

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4

Mollén, Katarina. "Water Depth Estimation Using Ultrasound Pulses for Handheld Diving Equipment." Thesis, Linköpings universitet, Institutionen för systemteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-117061.

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This thesis studies the design and implementation of an ultra-sonic water depth sounder. The depth sounder is implemented in a hand-held smart console used by divers. Since the idea of echo sounding is to measure the flight time between transmitting the signal and receiving the echo, the main challenge of this task is to find a time-of-flight (ToF) estimation for a signal in noise. It should be suitable for this specific application and robust when implemented in the device. The thesis contains an investigation of suitable ToF methods. More detailed evaluations of the matched filter, also know

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5

Sazak, Hakan Savas. "Estimation And Hypothesis Testing In Stochastic Regression." Phd thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/3/724294/index.pdf.

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Regression analysis is very popular among researchers in various fields but almost all the researchers use the classical methods which assume that X is nonstochastic and the error is normally distributed. However, in real life problems, X is generally stochastic and error can be nonnormal. Maximum likelihood (ML) estimation technique which is known to have optimal features, is very problematic in situations when the distribution of X (marginal part) or error (conditional part) is nonnormal. Modified maximum likelihood (MML) technique which is asymptotically giving the estimators equivalent to

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6

Olofsson, Ivar. "Enhancements in LTE OTDOA Positioning for Multipath Environments." Thesis, Linköpings universitet, Kommunikationssystem, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-131821.

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By using existing radio network infrastructure, a user can be positioned even where GPS and other positioning technologies lack coverage. The LTE Positioning Protocol (LPP) supports user Reference Signal Time Difference (RSTD) reports based on the Time of Arrival (TOA) for a Positioning Reference Signal (PRS). In the current reporting format, only one RSTD for each base station is considered, but for indoor environments this is easily biased due to fading and multipath issues, resulting in a Non-Line of Sight (NLOS) bias. With a rich User Equipment (UE) feedback that can represent the multipat

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7

Mohammad, Maruf H. "Blind Acquisition of Short Burst with Per-Survivor Processing (PSP)." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/46193.

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This thesis investigates the use of Maximum Likelihood Sequence Estimation (MLSE) in the presence of unknown channel parameters. MLSE is a fundamental problem that is closely related to many modern research areas like Space-Time Coding, Overloaded Array Processing and Multi-User Detection. Per-Survivor Processing (PSP) is a technique for approximating MLSE for unknown channels by embedding channel estimation into the structure of the Viterbi Algorithm (VA). In the case of successful acquisition, the convergence rate of PSP is comparable to that of the pilot-aided RLS algorithm. However, the pe

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8

Fares, Fares. "Traitement des signaux Argos 4." Thesis, Toulouse, INPT, 2011. http://www.theses.fr/2011INPT0024/document.

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Cette thèse est dédié à l’étude de la problématique des interférences multi utilisateurs dans le système Argos et à la proposition des diverses techniques pour réduire les effets de ces interférences. Le système Argos est un système mondial de localisation et de collecte de données géo positionnées par satellite. Il permet à l’échelle mondiale de collecter et de traiter les données émises par des émetteurs installés sur la surface de terre. Ces émetteurs sont connus sous le nom de balises. Ces balises sont installées sur des voiliers, des stations météo, des bouées, ainsi que sur quelques anim

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9

Bacharach, Lucien. "Caractérisation des limites fondamentales de l'erreur quadratique moyenne pour l'estimation de signaux comportant des points de rupture." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS322/document.

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Cette thèse porte sur l'étude des performances d'estimateurs en traitement du signal, et s'attache en particulier à étudier les bornes inférieures de l'erreur quadratique moyenne (EQM) pour l'estimation de points de rupture, afin de caractériser le comportement d'estimateurs, tels que celui du maximum de vraisemblance (dans le contexte fréquentiste), mais surtout du maximum a posteriori ou de la moyenne conditionnelle (dans le contexte bayésien). La difficulté majeure provient du fait que, pour un signal échantillonné, les paramètres d'intérêt (à savoir les points de rupture) appartiennent à u

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10

Santos, Helton Saulo Bezerra dos. "Essays on Birnbaum-Saunders models." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2013. http://hdl.handle.net/10183/87375.

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Nessa tese apresentamos três diferentes aplicações dos modelos Birnbaum-Saunders. No capítulo 2 introduzimos um novo método por função-núcleo não-paramétrico para a estimação de densidades assimétricas, baseado nas distribuições Birnbaum-Saunders generalizadas assimétricas. Funções-núcleo baseadas nessas distribuições têm a vantagem de fornecer flexibilidade nos níveis de assimetria e curtose. Em adição, os estimadores da densidade por função-núcleo Birnbaum-Saunders gene-ralizadas assimétricas são livres de viés na fronteira e alcançam a taxa ótima de convergência para o erro quadrático integ

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11

Tsai, Chia-Hung, and 蔡嘉鴻. "Low-complexity ML Doppler Spread Estimation for OFDM Systems." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/91485105639865188737.

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12

Li, Jia-Xing, and 李佳興. "A Novel ML Estimation of Time and Frequency Offset in the BPSK-OFDM System." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/94438463319734206155.

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碩士<br>國立暨南國際大學<br>通訊工程研究所<br>95<br>OFDM technique has advantages in providing a high data transmission capacity, being robust to the selective fading effects, combating inter-symbol interference (ISI), and so on. OFDM with above advantages becomes more significant in the future wireless communication systems. However, the knowledge of symbol timing offset and frequency offset are required for demodulation in OFDM systems. Previously, the ML estimation of timing and frequency offset in OFDM systems employing cyclic prefix has been presented with the assumption of independent identical distribut

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13

Hong, Ming-Chih, and 洪明志. "Frequency Synchronization and Channel Estimation for OFDM Systems over Frequency-Flat Channels: ML and LS Approaches." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/42366168221715496117.

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碩士<br>淡江大學<br>電機工程學系碩士班<br>96<br>Orthogonal frequency division multiplexing (OFDM) is a new generation modulation technique. OFDM system is robust against the fading effects of multipath propagation. The IEEE 802.11a applies OFDM for wireless local area networks (WLAN) as standard specification. OFDM has several advantages ：reduced computational complexity、exploitation of frequency diversity、and robust against narrowband interference. In this paper, we consider joint frequency offset and channel estimation assuming timing synchronization has been completed .Flat fading channels are considered.

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14

Nan, Shang-Chieh, and 南尚傑. "Frequency Synchronization and Channel Estimation for OFDM Systems over Frequency-Selective Channels: ML and LS Approaches." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/82824895887736290942.

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碩士<br>淡江大學<br>電機工程學系碩士班<br>96<br>In this thesis, we first introduced the basic principle of the orthogonal frequency division multiplexing (OFDM) transmission and modulation technique. Second, we present a maximum-likelihood (ML) estimation algorithm for jointly estimate frequency offset and channel frequency response (CFR) for OFDM systems in frequency selective channels. Then, with proper approximations after frequency offset correction, a least squares approach is also used for channel estimation for comparison. The frequency offset may arise from both carrier frequency mismatch and Doppler

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15

Gelin, Michaela Nicole. "Type I error rates of the DIF MIMIC approach using Joreskog’s covariance matrix with ML and WLS estimation." Thesis, 2005. http://hdl.handle.net/2429/17323.

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This dissertation presents new research that examines the Type I error rate of a structural equation modeling (SEM) approach for investigating differential item functioning (DIF) in short scales. Specifically Muthen's S EM model for DIF is examined using a new estimation method (Joreskog, 2002). In general, this method conditions on the latent variable while simultaneously testing the effect of the grouping variable over-and-above the underlying latent variable of interest. Thus, it is a multiple-indicators, multiple-causes (MIMIC) model for DIF. The Type I error rates of this DIF MIMIC approa

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16

Chen, Hou-Lin, and 陳侯霖. "An Investigation into the Properties of ML-NVE with Channel Estimation Error and Carrier Frequency Offset in OFDM Systems." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/v54849.

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碩士<br>國立中山大學<br>通訊工程研究所<br>97<br>Noise variance estimator is very important in communication system which could control the transmission power and help system to reach the maximum capacity. But almost every kind of noise variance estimators assume that channel status is perfectly. Unfortunately the estimation error is always existence. This paper discuss that the maximum likelihood noise variance estimator (ML-NVE) in orthogonal frequency division multiplexing (OFDM) system with estimated channel. We take two kinds of the most popular channel estimation (CE) schemes Least Square (LS) and Modif

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17

Vicente, David José Marques. "Distributed Algorithms for Target Localization in Wireless Sensor Networks Using Hybrid Measurements." Master's thesis, 2017. http://hdl.handle.net/10362/27875.

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This dissertation addresses the target localization problem in wireless sensor networks (WSNs). WSNs is now a widely applicable technology which can have numerous practical applications and offer the possibility to improve people’s lives. A required feature to many functions of a WSN, is the ability to indicate where the data reported by each sensor was measured. For this reason, locating each sensor node in a WSN is an essential issue that should be considered. In this dissertation, a performance analysis of two recently proposed distributed localization algorithms for cooperative 3-D wirel

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