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Dissertations / Theses on the topic 'Carrier synchronization'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Yao, Yao, and 姚瑤. "Carrier synchronization techniques in MIMO systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B31246230.

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2

Remvik, Per Kristian. "Carrier Synchronization in OFDM without Use of Pilots." Doctoral thesis, Norwegian University of Science and Technology, Department of Telematics, 2000. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1270.

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<p>Among new emerging digital communication systems, there is a clear trend of an increasing number of services using high capacity broad band connections, e.g. transfer of images, video and high quality sound. This makes it necessary to find bandwidth efficient modulation formats and efficient channel equalization solutions at the receiver. A modulation format, with possibilities for both relatively simple equalizer structures and bandwidth efficient solutions is Orthogonal Frequency Division Multiplexing (OFDM). The symbol stream is divided into parallel symbol streams, which are modulated o

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3

Aziz, Babar. "Frequency synchronization for carrier allocation in uplink OFDMA systems." Phd thesis, Université de Cergy Pontoise, 2011. http://tel.archives-ouvertes.fr/tel-00767906.

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La mise en oeuvre de systèmes basés OFDMA nécessite une synchronisation de la fréquence très fine en raison de l'extrème sensibilité de l'OFDMA aux décalages en fréquence porteuse (CFO). La synchronisation en fréquence devient plus difficile dans les systèmes OFDMA en liaison montante. Nos objectifs comprennent l'étude et l'analyse des problèmes résultant de décalages de fréquence et la proposition de solutions pour lutter contre ces problèmes. Nous examinons d'abord les interférences résultant de décalages de fréquence porteuse présents dans l'oscillateur du terminal utilisateur. Nous démontr

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4

Kim, Inwoong. "SYNCHRONIZATION IN ADVANCED OPTICAL COMMUNICATIONS." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3564.

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All-optical synchronization and its application in advanced optical communications have been investigated in this dissertation. Dynamics of all-optical timing synchronization (clock recovery) using multi-section gain-coupled distributed-feedback (MS-GC DFB) lasers are discussed. A record speed of 180-GHz timing synchronization has been demonstrated using this device. An all-optical carrier synchronization (phase and polarization recovery) scheme from PSK (phase shift keying) data is proposed and demonstrated for the first time. As an application of all-optical synchronization, the characteriza

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5

Shaw, Christopher G. "Modulation and Synchronization for Aeronautical Telemetry." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/3971.

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Aeronautical telemetry systems have historically been implemented with constant envelope modulations like CPM. Shifts in system constraints including reduced available bandwidth and increased throughput demands have caused many in the field to reevaluate traditional methods and design practices. This work examines the costs and benefits of using APSK for aeronautical telemetry instead of CPM. Variable rate turbo codes are used to improve the power efficiency of 16- and 32-APSK. Spectral regrowth in nonlinear power amplifiers when driven by non-constant envelope modulation is also considered. S

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6

Jordaan, G. D. "Carrier recovery for 49 quadrature partial response signals." Interim : Interdisciplinary Journal, Vol 7, Issue 1: Central University of Technology Free State Bloemfontein, 2008. http://hdl.handle.net/11462/380.

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Published Article<br>A reference carrier signal should be regenerated from a received partial response (PR) signal in order to facilitate optimal demodulation of the received signal. This paper describes the development and evaluation of such a carrier recovery system using DSP techniques. The relative phase of a free-running local oscillator at the receiver is synchronized with the carrier signal of a received 49 quadrature partial response signal (49QPRS). Synchronization is achieved and maintained by means of a process of cross-correlation.

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7

Caouras, Nestor. "Fast all-digital carrier synchronization techniques for linear modulation formats." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0019/MQ47824.pdf.

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8

Ni, Min. "An Optimized Software-Defined-Radio Implementation of Time-Slotted Carrier Synchronization for Distributed Beamforming." Digital WPI, 2010. https://digitalcommons.wpi.edu/etd-theses/1015.

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"This thesis describes the development of an optimized software-defined-radio implementation of a distributed beamforming system and presents experimental results for two-source and three- source wired-channel and acoustic-channel distributed beamforming using the time-slotted round-trip carrier synchronization protocol. The frequency and phase synthesizer used in this system is based on an optimized ``hybrid' phase locked loop (PLL) with averaging window which is shown to have high frequency estimation accuracy and consistency. For the wired-channel experiments, each source node was implement

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9

Wu, Yik Chung. "New advances in symbol timing synchronization of single-carrier, multi-carrier and space-time multiple-antenna systems." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2579.

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In this dissertation, the problem of symbol timing synchronization for the following three different communication systems is studied: 1) conventional single-carrier transmissions with single antenna in both transmitter and receiver; 2) single-carrier transmissions with multiple antennas at both transmitter and receiver; and 3) orthogonal frequency division multiplexing (OFDM) based IEEE 802.11a wireless local area networks (WLANs). For conventional single-carrier, single-antenna systems, a general feedforward symbol-timing estimation framework is developed based on the conditional maximum lik

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10

Zhou, Mingda. "Carrier Synchronization, Impairment Estimation and Interference Alignment for Wireless Communication Systems." Digital WPI, 2019. https://digitalcommons.wpi.edu/etd-dissertations/567.

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Wireless communication systems utilize the wireless medium to perform over-the-air (OTA) data transfer. There are many factors that can impact the quality of wireless communications, such as medium imperfection, interfering environment, mismatch of transceivers, etc. To mitigate these problems and improve the quality of service (QoS), this research study is conducted on three important topics including synchronization techniques, impairment estimation theory and techniques, and interference alignment techniques. In this thesis, it firstly present a dual link algorithm to align and manage the i

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11

Gul, Malik Muhammad Usman. "Timing and frequency synchronization for orthogonal frequency division multiple-access systems." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52328.

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Reliable timing and frequency synchronization is a major requirement in orthogonal frequency division multiple-access (OFDMA) systems as synchronization errors can result in inter-symbol-interference (ISI) and inter-carrier-interference (ICI) in the received signal, which severely degrade system performance. Thus, the objective of the proposed research is to develop, analyze, and prototype timing and frequency synchronization techniques for downlink (DL) and uplink (UL) OFDMA transmissions. For synchronization in DL OFDMA transmissions, we have developed conditions to select appropriate Zadoff

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12

Palmer, Joseph. "A HIGH-ACCURACY AND LOW-COMPLEXITY CARRIER-OFFSET-FREQUENCY ESTIMATOR." International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604513.

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ITC/USA 2007 Conference Proceedings / The Forty-Third Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2007 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>A single-tone frequency estimator for a non-uniformly sampled sinusoid is proposed. A nonuniformly sampled sinusoid may be generated from the received training sequences of a telemetry link. The frequency of the sinusoid matches the carrier-frequency-offset (CFO) of the received signal, and estimation of this quantity allows a receiver to compensate for the CFO. The performance bounds of this

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13

Jedlička, Petr. "Softwarový přijímač GNSS." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413152.

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The thesis deals with the analysis and the reception of the freely available signals of the navigation satellites in the L1 and E1 bands of the GPS and Galileo systems. The described signal reception sections include the process of the acquisition, the carrier frequency and phase synchronization and tracking, the spreading code phase tracking, the signal demodulation and the channel decoding. The simulation of the entire receiver is performed in MATLAB. The deeply analyzed signal reception component is the one responsible for the carrier phase and frequency synchronization and tracking. In tha

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14

Li, Hongxiang. "Performance of multitone direct sequence speread [sic] spectrum in the presence of imperfect carrier synchronization." Ohio : Ohio University, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1103057412.

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15

Zhang, Boyang. "Real-time software-defined-radio implementation of time-slotted carrier synchronization for distributed beamforming." Worcester, Mass. : Worcester Polytechnic Institute, 2009. http://www.wpi.edu/Pubs/ETD/Available/etd-050509-200154/.

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Thesis (M.S.)--Worcester Polytechnic Institute.<br>Keywords: distributed beamforming; carrier synchronization; software-defined-radio; sensor networks; wireless networks; cooperative transmission; virtual antenna arrays. Includes bibliographical references (leaves 168-169).

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16

Li, Hongxiang. "Performance of Multitone Direct Sequence Spread Spectrum in the Presence of Imperfect Carrier Synchronization." Ohio University / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1103057412.

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17

Tingyan, Yao, Zhao Weigang, and Zhang Qishan. "A MODIFIED FOUR-QUADRANT FREQUENCY DISCRIMINATOR FOR CARRIER FREQUENCY ACQUISITION OF GPS RECEIVERS." International Foundation for Telemetering, 2005. http://hdl.handle.net/10150/605031.

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ITC/USA 2005 Conference Proceedings / The Forty-First Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2005 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>The four-quadrant frequency discriminator (FQFD) plays an important role in GPS receivers for carrier synchronization. This paper presents a detailed study of the operating principle of the FQFD, and the acquisition performance degradation due to the gain fluctuation of the FQFD is discussed. A modified FQFD called the enveloped-four-quadrant frequency discriminator (Enveloped-FQFD) is propose

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18

Wang, Chong. "Modeling and Analysis of Synchronization Schemes for the TDMA Based Satellite Communication System." University of Toledo / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1351964768.

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19

Palmer, Joseph M. "Real-Time Carrier Frequency Estimation Using Disjoint Pilot Symbol Blocks." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/1780.

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Three new and efficient carrier frequency offset estimators are created for the case of disjoint pilot symbol blocks. The estimators are efficient in both a statistical sense and a computational sense. They are formulated to reduce computational cost for use in real-time applications, such as FPGA (field programmable gate array) devices. A reduced cost maximum likelihood (ML) frequency estimator is described. It is a generalization of the approximate ML estimator for a single block of pilot symbols. A number of recent ML estimation techniques are integrated with the purpose of reducing the com

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20

Coey, Tyson Curtis. "Round-trip time-division distributed beamforming." Link to electronic thesis, 2007. http://www.wpi.edu/Pubs/ETD/Available/etd-071007-124515/.

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21

Figueredo, Caio Gomes de. "Full digital BPSK demodulator with supressed carrier for satellite telecommand channel applications." Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=16729.

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CoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel Superior<br>This work presents a new structure for an all-digital BPSK demodulator developed for space communications that performs simultaneously the sampling and down-conversion of the the intermediate frequency signal to the baseband signal. The most important aspect of this work is the design of a new interpolator to retrieve lost samples during the down conversion process, and also to simplify the demodulator implementation. This interpolator correlates the samples of the output signal in such way that it was necessary to design a optimum

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22

Booysen, Samuel. "The design of a high speed topology for a QPSK demodulator with emphasis on the synchronization algorithms needed for demodulation." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4107.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: This thesis describes the design and implementation of a software based QPSK demodulator with a demodulation speed of 100 Mbps. The objective of the thesis was to identify a topology for the QPSK demodulator that would allow for high data rates and the design of the synchronization algorithms for carrier and symbol recovery. The QPSK demodulator was implemented on an Altera Stratix II field programmable gate array (FPGA), which does complex I and Q sampling on a down converted 7

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23

Lowham, Keith D. "Synchronization analysis and simulation of a standard IEEE 802.11g OFDM signal." Thesis, Monterey, California. Naval Postgraduate School, 2004. http://hdl.handle.net/10945/1652.

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Approved for public release, distribution is unlimited<br>Synchronization of orthogonal frequency-division multiplexed (OFDM) signals is significantly more difficult than synchronization of a single-carrier system. The recently approved IEEE Standard 802.11g specifies a packet-based OFDM system that provides a basis for the discussion of OFDM synchronization in a packet-based environment. Algorithms that synchronize the receiver carrier demodulation frequency and phase, the data frame, the OFDM symbol timing, and the data symbol timing are discussed and analyzed in an AWGN channel. System View

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24

Nilsson, Johan, and Mikael Rothin. "Live Demonstration of Mismatch Compensation for Time-Interleaved ADCs." Thesis, Linköpings universitet, Elektroniksystem, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-78709.

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The purpose of this thesis is to demonstrate the effects of mismatch errors that occur in time-interleaved analog-to-digital converters (TI-ADC) and how these are compensated for by proprietary methods from Signal Processing Devices Sweden AB. This will be demonstrated by two different implementations, both based on the combined digitizer/generator SDR14. These demonstrations shall be done in a way that is easy to grasp for people with limited knowledge in signal processing. The first implementation is an analog video demo where an analog video signal is sampled by such an TI-ADC in the SDR14,

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25

[Verfasser], Kittipong Piyawanno, Berthold [Akademischer Betreuer] Lankl, and Henning [Akademischer Betreuer] Bülow. "Carrier Synchronization in High Bit-Rate Optical Transmission Systems / Kittipong Piyawanno. Universität der Bundeswehr München, Fakultät für Elektrotechnik und Informationstechnik. Gutachter: Henning Bülow. Betreuer: Berthold Lankl." Neubiberg : Universitätsbibliothek der Universität der Bundeswehr, 2012. http://d-nb.info/1024414817/34.

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26

Piyawanno, Kittipong [Verfasser], Berthold [Akademischer Betreuer] Lankl, and Henning [Akademischer Betreuer] Bülow. "Carrier Synchronization in High Bit-Rate Optical Transmission Systems / Kittipong Piyawanno. Universität der Bundeswehr München, Fakultät für Elektrotechnik und Informationstechnik. Gutachter: Henning Bülow. Betreuer: Berthold Lankl." Neubiberg : Universitätsbibliothek der Universität der Bundeswehr, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:706-2908.

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27

Zedka, Radim. "Softwarový přijímač pro dálkový průzkum Země v pásmu X." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-400551.

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Práce se zabývá procesem návrhu digitálního přijímače pro signály družic dálkového průzkumu Země v pásmu X. V první části je uveden seznam družic které umožnují příjem vědeckých dat pomocí amatérských neautorizovaných stanic. Jsou zde vypsány základní signálové parametry některých družic, z nichž EOS-PM-1 je zvolena jako hlavní objekt pro návrh přijímače. Ve druhé části je použit software MATLAB pro simulaci družicového O-QPSK signálu v základním pásmu, mechanizmu kompenzace kmitočtového ofsetu, synchronizaci nosné, symbolové synchronizaci, rámcové synchronizaci a odstranění fázové dvojznačnos

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28

Jagoš, Ľubomír. "Generování OFDM signálů pomocí generátoru libovolných průběhů LW410." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316436.

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This thesis describing basic concepts and parts of OFDM modulator, showing their implementation in Matlaba. It's also focusing on how to use USRP with Matlab and creating functional OFDM modulator. Main efford is forwarded to practical impelementation of OFDM using available hardware.

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29

Lenez, Thierry. "Synchronisation et égalisation en communication numérique : application au modem VDSL." Grenoble INPG, 2001. http://www.theses.fr/2001INPG0058.

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30

Segkos, Michail. "Advanced techniques to improve the performance of OFDM Wireless LAN." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Jun%5FSegkos.pdf.

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Thesis (M.S. in Electrical Engineering and M.S. in Applied Physics)--Naval Postgraduate School, June 2004.<br>Thesis advisor(s): Tri T. Ha, Brett H. Borden. Includes bibliographical references (p. 107-109). Also available online.

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31

Jhaidri, Mohamed Amine. "Techniques de synchronisation à très faible SNR pour des applications satellites." Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2017. http://www.theses.fr/2017IMTA0038/document.

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Les transmissions numériques par satellite sont largement utilisées dans plusieurs domaines allant des applications commerciales en orbites terrestres aux missions d'exploration scientifiques en espace lointain (Deep Space). Ces systèmes de transmission fonctionnent sur des très grandes distances et ils disposent des ressources énergétiques très limitées. Cela se traduit par un très faible rapport signal à bruit au niveau de la station de réception terrestre. Une possibilité d'établir une liaison fiable dans ces conditions très défavorables, réside dans l'utilisation de codes correcteurs d'err

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32

Туровський, Олександр Леонідович, Александр Леонидович Туровский та Oleksandr Leonidovych Turovsky. "Моделі та методи підвищення точності роботи систем фазової синхронізації супутникових телекомунікацій в режимі стеження за несучою частотою". Thesis, Національний авіаційний університет, 2021. https://er.nau.edu.ua/handle/NAU/49647.

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У дисертаційній роботі вирішується актуальна науково-технічна проблема розроблення моделей та методів підвищення точності роботи систем фазової синхронізації супутникових телекомунікацій в режимі стеження за несучою частотою. У роботі розроблено моделі та методи синтезу комбінованої системи фазової синхронізації когерентних демодуляторів в режимі стеження за несучою частотою в сталому та перехідному режимах роботи супутникових телекомунікації, які дозволяють синтезувати комбіновані системи синхронізації з суттєвими перевагами по швидкодії і точності оцінки несучої частоти на відміну від

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33

Lin, Wei-Tsen, and 林威岑. "Investigation of Kalman Filtering for Adaptive Carrier Synchronization." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/72604154178640338462.

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碩士<br>國立中央大學<br>通訊工程研究所<br>93<br>In this thesis, we study the adaptive carrier synchronization by using the Kalman filtering technique. Practically, such problem can be resolved by a carrier synchronization loop in the receiver. Conventionally, a feedback loop called the phase-locked loop (PLL) is used to implement the carrier synchronization loop. However, due to the fixed loop bandwidth, the design of a PLL always needs the acquisition time and steady-state phase tracking variation of the carrier recovery loop to be compromised and thus possesses a design challenge for designers.Instead a le

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Liu, Jen-Heng, and 劉任恆. "The Effect of Multipath on Carrier Frequency Synchronization." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/47293794875198083464.

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碩士<br>國立交通大學<br>電信工程研究所<br>101<br>In the communication systems, the channel multipath fading will cause Inter-symbol interference (ISI). In this thesis, the Square Timing Recovery is used to get correct Timing. The design of carrier recovery subsystem is used to compensate the frequency error. However, the convergence of the output constellation from system is not satisfactory. Therefore, we use the Linear Least Mean Square equalizer as last stage to overcome the constellation convergence problem and compensate carrier phase error. Finally, analysis of channel fading on the timing and carrier

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Swain, Priyaranjan, and J. K. Chaitanya Goudu. "Effect of Synchronization error in Multi Carrier systems." Thesis, 2012. http://ethesis.nitrkl.ac.in/3582/1/Effect_of_Synchrnozation_Error_in_Multi_Carrier_Systems.pdf.

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Communications as an important aspect life plays a major role in our daily routine. With the progress in age and growth in its demand, there has been rapid development in the field of communications. Analog signals which were used to send information previously are now sent in digital domain in a much wider range. For better performance in terms of transmissions, single carriers are replaced by multi-carriers Some of the methods that use multi-carriers for transmission are Orthogonal Division Frequency Multiplexing (OFDM), Code Division Multiple Access (CDMA). In OFDM system, orthogonally plac

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Di, Girolamo Rocco. "Fast and efficient carrier synchronization for burst-mode communications." Thesis, 1993. http://spectrum.library.concordia.ca/3246/1/MM90850.pdf.

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Chien, Yan-Hao, and 簡彥豪. "Study of Time Synchronization and Calibration Using GPS Carrier Phase." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/50758603793909890276.

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碩士<br>國立勤益技術學院<br>資訊與電能科技研究所<br>94<br>The main purpose of this paper is to calibrate the time by using GPS carrier phase measurements. The rubidium atom clock supposes the atom clock of the satellites, then we can obtain the transmission error via the signal of 1PPS of the GPS receiver single frequency observation. In this paper, we utilize GPS carrier phase measurements to calibrate the time synchronization and frequency stability. So far the most papers are to utilize two GPS receivers measurement, and perform the frequency stabilizing and the vehicle positioning with the double differences.

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"Synchronization of multi-carrier CDMA signals and security on internet." Chinese University of Hong Kong, 1996. http://library.cuhk.edu.hk/record=b5888906.

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by Yooh Ji Heng.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 1996.<br>Includes bibliographical references (leaves 119-128).<br>Appendix in Chinese.<br>Chapter I --- Synchronization of Multi-carrier CDMA Signals --- p.1<br>Chapter 1 --- Introduction --- p.2<br>Chapter 1.1 --- Spread Spectrum CDMA --- p.4<br>Chapter 1.1.1 --- Direct Sequence/SS-CDMA --- p.5<br>Chapter 1.1.2 --- Frequency Hopping/SS-CDMA --- p.5<br>Chapter 1.1.3 --- Pseudo-noise Sequence --- p.6<br>Chapter 1.2 --- Synchronization for CDMA signal --- p.7<br>Chapter 1.2.1 --- Acquisition of PN Sequence --- p.7<br>

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Liao, Yi-Ching, and 廖宜慶. "Carrier Synchronization of OFDM Systems over Dispersive Multipath Fading Channels." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/97214179673754472281.

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博士<br>國立臺灣大學<br>電信工程學研究所<br>94<br>In recent years, the spectacular growth of video, voice and data communication over the Internet and the equally rapid pervasion of mobile telephony justify the great expectations for mobile multimedia. Research and development are taking place all over the world to define the next generation wireless broadband multimedia communications system that may create the global information village. While present communications systems are primarily designed for one specific application, such as speech on mobile telephony or high-rate data in wireless local area networ

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Ke, Chyuan-Jen, and 柯全真. "Research on Symbol and Carrier Synchronization Techniques for TDMA Systems." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/17877645139549946316.

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Chien, Lu-Chung, and 簡盧忠. "Low Complexity Carrier Frequency Synchronization for DVB-T/H System." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/40807956752538752118.

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碩士<br>國立交通大學<br>電子工程系所<br>93<br>In this thesis, a low complexity carrier frequency offset (CFO) synchronization scheme is proposed for Digital Video Broadcasting-Terrestrial/Handheld (DVB-T/H) system, which comprises two acquisition strategies and a tracking loop. The proposed fractional CFO acquisition algorithm can overcome the distortion caused by multipath delay spread and achieves 0.25~7.8dB gain in RMSE compared with the conventional approach. A 2-stage scheme is proposed for the integral CFO acquisition to reduce the search range. Besides, two low complexity algorithms are also proposed

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Chen, Yii-Wen, and 陳顗文. "The Research of Carrier Frequency Synchronization Algorithm for OFDM Systems." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/80805161525602180848.

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碩士<br>國立雲林科技大學<br>電機工程系碩士班<br>90<br>Orthogonal Frequency Division Multiplexing (OFDM) has been widely applied to several mobile radio communication systems. OFDM technique is an efficient transmission scheme to cope with many possible channel impairments than other multicarrier communication systems. These include surviving in multipath fading channel, yielding the high spectral efficiently, and effectively reduces the intersymbol interference (ISI). However one of the major drawbacks of the OFDM systems is its high sensitivity to carrier frequency offset. Many algorithms were proposed under t

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Chen, Hsin-Nan, and 陳信男. "The Study of Carrier Synchronization for MIMO-OFDM Baseband Designs." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/65364809988821855834.

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碩士<br>國立交通大學<br>網路工程研究所<br>95<br>Multiple-Input Multiple-Output Orthogonal Frequency Division Modulation (MIMO-OFDM) is the candidate for next generation of wireless communication. However, implementation of MIMO-OFDM suffers from the problem caused by carrier synchronization. This thesis will address two performance degrading effects of carrier synchronization, namely, I/Q imbalance and Carrier Frequency Offset (CFO). The I/Q imbalance is caused by the mismatch between the I and Q branches and the CFO is caused by the mismatch of radio frequency circuits between the transmitter and receiver.

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Jia-Hao, Wu. "Maximum Likelihood Multiuser Carrier Frequency Offset Synchronization in DS-CDMA Systems." 2005. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2907200514085300.

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Wu, Jia-Hao, and 吳家豪. "Maximum Likelihood Multiuser Carrier Frequency Offset Synchronization in DS-CDMA Systems." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/86530977986668742668.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>93<br>We investigate multiuser synchronization problems fundamentally by using maximum likelihood estimation techniques. In particular, we put most efforts on multiuser carrier frequency offset estimation. Due to the special contour shape of ML estimation metric function, a two-stage estimation method including DFT coarse search and neighborhood search is described in single-user case and extended to multiuser case. We discuss multiple-access interference (MAI) in the presence of carrier frequency offset. From the maximum likelihood viewpoints, we suggest the succes

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Tsai, Tzung-Ru, and 蔡宗儒. "Blind channel identification and synchronization for single-carrier block transmission system." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/j58kmg.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>94<br>By advance of communication system, channel response acts a key point for increasing the transmission rate. An efficient blind channel identification and synchronization method is introduced here for equalization and synchronization in single carrier block transmission system by means of subspace algorithm. The channel impulse response (CIR) is acquired from Singular Value Decomposition (SVD) of the auto-correlation matrix by observing a small amount of data records. We also demonstrate the necessary and sufficient condition of subspace algorithm to proof the C

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CHOU, FU-SHAN, and 周福山. "Improving Clock Synchronization Precision over Carrier Ethernet for Wireless Backhaul Networks." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/7mfn3b.

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碩士<br>中華大學<br>資訊工程學系碩士在職專班<br>101<br>Telecommunications network switching technology is rapidly converted from the circuit-switched to packet-switched technology. In circuit-switched networks TDM (Time-Division Multiplexing, TDM) is used to achieve accurate frequency synchronization. In packet-switched networks high QoS (Quality of Service, QoS) and MSAN (Multi-Service Access Node) depend on frequency synchronization in the backhaul networks. Ethernet is a main technology of packet-switching networks. Whether carrier-grade synchronization quality can be provided to wireless base stations and r

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Fan, Ze-Wei, and 范澤崴. "Carrier Frequency Synchronization with Extensive Estimation Range for Wireless OFDM Communications." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/93819742593437869837.

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碩士<br>國立暨南國際大學<br>電機工程學系<br>97<br>Orthogonal frequency division multiplexing (OFDM) techniques are well popular and attractive for high-data-rate wireless transmission. A well-known problem in OFDM systems is the synchronization issues, including both timing shift and frequency offset. Carrier frequency offset (CFO) and symbol time offset can cause intersymbol (ISI) and intercarrier interference (ICI) and degrade system performance seriously. For this reason, how to correctly estimate carrier frequency offset and time offset in the receiver end of OFDM systems is a crucial mission. In this the

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Liu, Dong-Hong, and 劉東鋐. "Design and Analysis of Carrier and Code Synchronization for GNSS Receiver." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/87479133881711124368.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>96<br>The United State Global Positioning System (GPS) is the familiar Global Navigation Satellite System (GNSS). The European Union will develop its own next generation GNSS, called Galileo Positioning System. In the thesis, the Low-IF receiver architecture is adopted to receive GPS/Galileo E1 signal. In the thesis, the non-constant group delay of the RF front-end complex filter and the baseband signal processing effect is analyzed for low-IF receiver. Galileo E1 system has a code period of 4ms which is quadruple that of GPS C/A code. In other words, due to the

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Chang, Chin-Yi, and 張靜宜. "Initial Synchronization in Carrier Aggregation Scenarios Applied on LTE-A Communications." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/82248893748227147248.

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碩士<br>國立中央大學<br>通訊工程研究所<br>99<br>Since the demand of high speed mobile broadband services, the International Telecommunication Union - Radio Communication Sector (ITU-R) has proposed the next generation mobile communication system Long term evolution advanced (LTE-Advanced) which will retain most of the system construction in Long term evolution (LTE) and increase the performance of it. Then, LTE-Advanced proposes carrier aggregation (CA) to aggregate component carriers (CCs) which I belonging to contiguous or non-contiguous frequency bands and it is used to meet the specification of future

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