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Dissertations / Theses on the topic 'Sideload'

Author: Grafiati

Published: 22 February 2023

Last updated: 31 July 2025

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1

Herold, F. W., and J. A. Kaiser. "ELIMINATION OF SIDELOBE RESPONSE." International Foundation for Telemetering, 1998. http://hdl.handle.net/10150/607377.

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International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, California<br>Conventional phased arrays nominally sum the signals received by the elements prior to detection. By multiplying rather than summing signals received from pairs of elements, i.e., interferometer pairs, a set of Spatial Frequencies (SFs) is obtained. Obtaining the SFs requires employment of a multiple local oscillator technique. When summed, these spatial frequencies produce a single lobed (voltage) radiation pattern which, when passed through

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2

Oruc, Ercan, and Sargun Goktun. "Sidelobe canceller jamming using hot-clutter." Thesis, Monterey California. Naval Postgraduate School, 2004. http://hdl.handle.net/10945/1419.

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Approved for public release; distribution is unlimited<br>Coherent Sidelobe Cancellation (CSLC) is a coherent processing technique that has the potential of reducing noise jamming through the antenna side lobes. Present CSLCs have the capability of reducing the noise jamming by 25 to 35 dB. The maximum number of side lobe jammers that can be handled by a CSLC is equal to the number of auxiliary antennas. The performance of CSLC is governed by nonlinear stochastic differential equations that are not solvable by analytic means. Therefore this thesis employs simulation techniques to solve these e

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3

Goktun, Sargun Oruc Ercan. "Sidelobe canceller jamming using hot-clutter /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Sep%5FGoktun.pdf.

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4

Armas, Nelson A. "Low sidelobe reflector antenna design for communications." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA276079.

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5

Haliloglu, Onur. "Successive Target Cancelation For Radar Waveform Sidelobe Reduction." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607595/index.pdf.

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Many radars suffer from masking of weaker targets by stronger ones due to range sidelobes of pulse compression codes. We propose a method to prevent this by successively detecting targets and canceling their effects. Performance of the proposed method will be investigated in various scenarios with regard to existence of noise, targets, and the Doppler effect.

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6

Yuan, Zhou. "Sidelobe suppression and agile transmission techniques for multicarrier-based cognitive radio systems." Worcester, Mass. : Worcester Polytechnic Institute, 2009. http://www.wpi.edu/Pubs/ETD/Available/etd-050309-163215/.

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7

Collins, Timothy. "Active sonar pulse design." Thesis, University of Birmingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311535.

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8

Townsend, Phil. "Enhancements to the Generalized Sidelobe Canceller for Audio Beamforming in an Immersive Environment." UKnowledge, 2009. http://uknowledge.uky.edu/gradschool_theses/645.

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The Generalized Sidelobe Canceller is an adaptive algorithm for optimally estimating the parameters for beamforming, the signal processing technique of combining data from an array of sensors to improve SNR at a point in space. This work focuses on the algorithm’s application to widely-separated microphone arrays with irregular distributions used for human voice capture. Methods are presented for improving the performance of the algorithm’s blocking matrix, a stage that creates a noise reference for elimination, by proposing a stochastic model for amplitude correction and enhanced use of cross

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9

Krishnamurthy, Siddhartha. "Peak Sidelobe Level Distribution Computation for Ad Hoc Arrays using Extreme Value Theory." Thesis, Harvard University, 2014. http://dissertations.umi.com/gsas.harvard:11300.

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Extreme Value Theory (EVT) is used to analyze the peak sidelobe level distribution for array element positions with arbitrary probability distributions. Computations are discussed in the context of linear antenna arrays using electromagnetic energy. The results also apply to planar arrays of random elements that can be transformed into linear arrays.<br>Engineering and Applied Sciences

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10

Vinagre, i. Solans Lluis. "Ultra low range sidelobe level pulse compression waveform design for spaceborne meteorological radars." Thesis, University College London (University of London), 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265985.

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11

El-Azhary, Ismail. "Simple and fast sidelobe cancellation techniques for phased array antennas using parallel microprocessor control." Thesis, University of Bradford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253323.

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12

Sail, Amit P. "Hardware Implementation of Filtering Based Sidelobe Suppression for Spectrally Agile Multicarrier based Cognitive Radio Systems." Digital WPI, 2013. https://digitalcommons.wpi.edu/etd-theses/63.

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Due to the ever increasing dependency on existing wireless technologies and the growing usage of sophisticated wireless devices, the demand for bandwidth is rising exponentially. Also, the Federal Communications Commission (FCC) has reserved a considerable amount of spectrum for licensed users. As a result, the unlicensed spectrum usage is constrained to the overcrowded unlicensed spectrum. Various spectral management surveys have indicated inefficient spectrum utilization in the licensed spectral bands. The congested unlicensed spectrum and inefficiently used licensed frequency bands calls fo

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13

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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14

MANCHEGO, ALFREDO OMAR CORDOVA. "EFFECT OF THE PROBABILISTIC MODELING OF EARTH STATION ANTENNA SIDELOBE GAINS ON THE EVALUATION OF INTERFERENCE AMONG SATELLITE COMMUNICATION NETWORKS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2012. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=23168@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>PROGRAMA DE EXCELENCIA ACADEMICA<br>Quando diversos sistemas de comunicação compartilham uma determinada faixa de frequências, cada um dos sistemas envolvidos opera sujeito às interferências geradas pelos demais. Dentro de este panorama, cresce a importância de uma avaliação precisa dos efeitos de interferência. Dada a complexidade do problema, o cálculo de interferências é usualmente feito considerando diversas situações de pior caso. Estas situações de pior caso incluem, por

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15

Kaiser, Julius A. "RETRODIRECTIVE ANTENNA SYSTEM." International Foundation for Telemetering, 1995. http://hdl.handle.net/10150/608421.

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International Telemetering Conference Proceedings / October 30-November 02, 1995 / Riviera Hotel, Las Vegas, Nevada<br>Two retrodirective antenna systems that autonomously point high gain beams to a signal source without requiring a priori knowledge of location are described. The first is a stationary phased array requiring no phase shifters or switches for its operation. The second is a steerable platform with a thinned receive array for signal acquisition and platform pointing and dish(es) to satisfy the high gain function.

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16

CALLA, ALBERTH RONAL TAMO. "EVALUATION OF INTERFERENCE AMONG SATELLITE COMMUNICATIONS NETWORKS: JOINT EFFECT OF THE PROBABILISTIC MODELING OF EARTH STATION ANTENNA LOCATIONS AND ANTENNA SIDELOBE GAINS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2013. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=23373@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>FUNDAÇÃO DE APOIO À PESQUISA DO ESTADO DO RIO DE JANEIRO<br>PROGRAMA DE EXCELENCIA ACADEMICA<br>Num ambiente onde diversos sistemas de comunicação compartilham uma determinada faixa de frequências, cada um dos sistemas envolvidos opera sujeito às interferências geradas pelos demais sistemas. Neste ambiente, cresce a importância de uma avaliação precisa dos efeitos de interferência. Dada a complexidade do problema, o cálculo de interferências é usualmente feito considerando-se d

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17

Khan, Asim Ali. "Performance optimisation of small antenna arrays." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/performance-optimisation-of-small-antenna-arrays(759e6929-04ab-408c-aee3-404c72711cdb).html.

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This thesis addresses radiation pattern synthesis problems for small linear periodic phased arrays (with array elements less then 10). Due to the small array size conventional pattern synthesis techniques fail to produce the required results. In the case of practical small arrays, mutual coupling and element pattern asymmetric effect degrade the array radiation performance. The main performance metrics considered in this thesis include side lobe level (SLL), gain, halfpower beamwidth (HPBW) and mainbeam scan direction. The conventional pattern synthesis approaches result in sub optimal gain, S

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18

Balci, Burak. "On The Detection Of Sinusoidal Signals Under Sinusoidal Interference." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612785/index.pdf.

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A complex exponential waveform embedded in white noise can be optimally detected by matched filtering which is equivalent to Discrete Fourier Transform (DFT). However, if the input includes multiple complex exponentials, the DFT processing is not optimal. The frequency spectrum of the complex exponential signal with finite observation interval is not impulse. The spectrum includes side-lobes called spectral leakage.Because of the strong side-lobes, weak components can be masked, or side-lobes can be interpreted as independent complex exponentials causing false alarms. The conventional approach

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19

Guvenkaya, Ertugrul. "Multidimensional Waveform Shaping in Multicarrier Systems." Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5958.

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Constantly increasing demand for wireless communications in various applications has always led to new ways of modulating the radio frequency (RF) carrier signal by advancing waveform structure throughout generations. Although communication data rates are limited by the theoretical capacity, specific signaling designs for the signal that experiences natural and artificial effects in the transmission medium such as multipath fading channel, hardware impairments and multiuser environment promised better solutions in providing improved wireless access to various type of users and networks. Beside

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20

Sahin, Alphan. "Towards Interference-Immune and Channel-Aware Multicarrier Schemes: Filters, Lattices, and Interference Issues." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4936.

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In this dissertation, multicarrier schemes are reviewed within the framework of Gabor Systems. Their fundamental elements; what to transmit, i.e., symbols, how to transmit, i.e., filters or pulse shape, and where/when to transmit, i.e., lattices are investigated extensively. The relations between different types of multicarrier schemes are discussed. Within the framework of Gabor systems, a new windowing approach, edge windowing, is developed to address the out-of-band (OOB) radiation problem of orthogonal frequency division multiplexing (OFDM) based multicarrier schemes. To the best of our kn

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21

Spalt, Taylor Brooke. "Constrained Spectral Conditioning for the Spatial Mapping of Sound." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/70868.

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In aeroacoustic experiments of aircraft models and/or components, arrays of microphones are utilized to spatially isolate distinct sources and mitigate interfering noise which contaminates single-microphone measurements. Array measurements are still biased by interfering noise which is coherent over the spatial array aperture. When interfering noise is accounted for, existing algorithms which aim to both spatially isolate distinct sources and determine their individual levels as measured by the array are complex and require assumptions about the nature of the sound field. This work develo

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22

Hasegawa, Naoki. "Integral Study of GaN Amplifiers and Antenna Technique for High Power Microwave Transmission." Kyoto University, 2018. http://hdl.handle.net/2433/232041.

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23

Tom, Anas. "Physical Layer Algorithms for Interference Reduction in OFDM-Based Cognitive Radio Systems." Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5872.

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Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier transmission scheme used in most of the existing wireless standards such as LTE, WiFi and WiMAX. The popularity of OFDM stems from the multitude of benefits it offers in terms of providing high data rate transmission, robustness against multipath fading and ease of implementation. Additionally, OFDM signals are agile in the sense that any subcarrier can be switched on or off to fit the available transmission bandwidth, which makes it well suited for systems with dynamic spectrum access such as cognitive radio systems. Nonethe

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24

Khayeri, Parinaz. "Binaural Beamforming Robust to Errors in Direction of Arrival Estimates." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34442.

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Binaural beamforming technology, which is based on the auditory perception of both ears, uses a wireless data connection to exchange data between the right-side and the left-side hearing aids. Over the years, several multichannel speech enhancement algorithms have been used in the hearing aid industry. For example, beamforming algorithms work by keeping a target signal undistorted while attenuating the noise fields (such as diffuse noise or white noise) and the interferers from different directions. Fixed and adaptive algorithms of this nature have been under active investigation by the heari

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25

Ozdemir, Secil. "An Adaptive Fast Time Radar Receiving Filter For Minimization Of Clutter And Time Side-lobes." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615325/index.pdf.

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In this thesis, a maximum likelihood receiver to obtain the target range profile that uses the clutter prediction derived from the target-free previous observations is suggested as a fast time processor for pulse compression radar systems. The maximum likelihood receiver is proposed to overcome the range sidelobe problem, which is introduced by the pulse compression method. Conventional methods, such as the matched filter receiver, as fast time processor result in the targets with high radar cross sec- tion masking the low radar cross section targets at the neighboring range cells<br>since sid

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26

Trouchaud, Céline. "Les portraits d'enfants porteurs de l'Horuslocke dans le monde gréco-romain." Thesis, Toulouse 2, 2019. http://www.theses.fr/2019TOU20107.

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L'étude présentée dans le cadre de cette thèse a pour sujet les portraits d'enfants gréco-romains identifiés comme porteurs d'une coiffure désignée depuis les premiers travaux fondamentaux entrepris sur la question dans les années 1950 sous l'appellation « Horuslocke », « mèche d'Horus ». Cet arrangement capillaire se caractérise par la présence d'une mèche, laissée libre ou tressée, qui se détache du reste de la chevelure, celle-ci pouvant être, selon les exemples, longue, courte, voire rasée. La mèche est généralement figurée sur le côté droit de la tête mais peut également apparaître sur le

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Jörgensen, Eskil. "Cell Acquisition and Synchronization for Unlicensed NB-IoT." Thesis, Linköpings universitet, Kommunikationssystem, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-139862.

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Narrowband Internet-of-Things (NB-IoT) is a new wireless technology designed to support cellular networks with wide coverage for a massive number of very cheap low power user devices. Studies have been initiated for deployment of NB-IoT in unlicensed frequency bands, some of which demand the use of a frequency-hopping scheme with a short channel dwell time. In order for a device to connect to a cell, it must synchronize well within the dwell time in order to decode the frequency-hopping pattern. Due to the significant path loss, the narrow bandwidth and the device characteristics, decreasing t

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Moore, Darren C. "Speech enhancement using microphone arrays." Thesis, Queensland University of Technology, 2000. https://eprints.qut.edu.au/36141/1/36141_Moore_2000.pdf.

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This thesis presents a comparative analysis of baseline microphone array speech enhancement techniques that are prominent in current literature. Delay-sum beamforming, sub-array beamforming, near- and far-field superdirectivity, the generalised sidelobe canceller and the adaptive system for microphone-array noise reduction (AivINOR) are evaluated in varying noise conditions and for different array geometries. The effect of complementing each technique with a postfilter is also assessed. A novel beamformer, termed the near-field adaptive beamformer (NFAB), is introduced and then shown to prov

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Haneberg-Diggs, Dominique Miguel. "Seismic attributes of the Clinton interval reservoir in the Dominion East Ohio Gabor gas storage field near North Canton, Ohio." Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1418759184.

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30

Cattenoz, Mathieu. "MIMO Radar Processing Methods for Anticipating and Preventing Real World Imperfections." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112077/document.

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Le concept du radar MIMO est prometteur en raison des nombreux avantages qu'il apporte par rapport aux architectures radars actuelles : flexibilité pour la formation de faisceau à l'émission - large illumination de la scène et résolution fine après traitement - et allègement de la complexité des systèmes, via la réduction du nombre d'antennes et la possibilité de transférer des fonctions de contrôle et d'étalonnage du système dans le domaine numérique. Cependant, le radar MIMO reste au stade du concept théorique, avec une prise en compte insuffisante des impacts du manque d'orthogonalité des f

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Sucic, Victor. "Parameters selection for optimising time-frequency distributions and measurements of time-frequency characteristics of nonstationary signals." Thesis, Queensland University of Technology, 2004. https://eprints.qut.edu.au/15834/1/Victor_Sucic_Thesis.pdf.

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The quadratic class of time-frequency distributions (TFDs) forms a set of tools which allow to effectively extract important information from a nonstationary signal. To determine which TFD best represents the given signal, it is a common practice to visually compare different TFDs' time-frequency plots, and select as best the TFD with the most appealing plot. This visual comparison is not only subjective, but also difficult and unreliable especially when signal components are closely-spaced in the time-frequency plane. To objectively compare TFDs, a quantitative performance measure should be u

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Sucic, Victor. "Parameters Selection for Optimising Time-Frequency Distributions and Measurements of Time-Frequency Characteristics of Nonstationary Signals." Queensland University of Technology, 2004. http://eprints.qut.edu.au/15834/.

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The quadratic class of time-frequency distributions (TFDs) forms a set of tools which allow to effectively extract important information from a nonstationary signal. To determine which TFD best represents the given signal, it is a common practice to visually compare different TFDs' time-frequency plots, and select as best the TFD with the most appealing plot. This visual comparison is not only subjective, but also difficult and unreliable especially when signal components are closely-spaced in the time-frequency plane. To objectively compare TFDs, a quantitative performance measure should be u

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33

SACCOCCIO, LUCA. "Numerical simulation of shock wave/turbulent boundary layer interactions in over-expanded nozzles." Doctoral thesis, 2020. http://hdl.handle.net/11573/1361686.

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The performances of first-stage liquid rocket engines are highly dependent on the fluid dynamic behaviour of the expansion nozzle and for launch-trajectory optimisation purposes, large values of the ratio between the exit and throat areas are desirable. The maximum limit to this ratio is imposed by the need to avoid internal flow separation, since at sea level the flow is highly overexpanded. However, during the start-up phase the chamber pressure is below the design pressure and the flow separates from the nozzle wall. This condition is characterised by complex physical features, including th

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黃克強. "Studies of generalized sidelobe cancelling adaptive arrays." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/06878250048102220380.

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Chou, Ting-Heng, and 鄒定衡. "Spectral Sidelobe Properties in CS-CDMA System." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/35797754718787707034.

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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>In this thesis, general constraints on the employed spreading code are developed for comb spectrum code-division multiple access (CS-CDMA) systems to warrant the desirable spectral property that the power spectral sidelobes decay asymptotically as f-2Q-2, where Q is a preassigned positive integer. Precisely, f-4 and f-6-decaying codewords are designed to provide small sidelobes decaying and thus mitigate adjacent channel interference. It is shown that the sidelobe decaying characteristic of the CS-CDMA signal can be properly described by the code index of the

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Kumar, Mrigendra. "Sidelobe Suppression in Pulse Compresssed Radar Signal." Thesis, 2016. http://ethesis.nitrkl.ac.in/8619/1/2016_MT_214EC6427_Mrigendra_Kumar.pdf.

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Radio Detection And Ranging, RADAR, is a system that is used to detect and track a target at distant location with its other features (like velocity, direction etc.). The system uses various techniques to enhance its efficiency in terms of different physical parameters. Pulse compression technique provides the radar designers with an ability to combine the benefits of low power transmitters and the larger pulse wavelength to maintain the energy content of the pulse, in turn, the process elevates the range detection ability of high duration pulses and the resolution capacity of short pulses. To

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Chamma, Walid Afif. "Novel schemes for sidelobe reduction in aperture antennas." 1988. http://hdl.handle.net/1993/16600.

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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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Hsu, Yeh-Ju, and 許曄儒. "The study on sidelobe interference of OFDM systems." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/5yhfht.

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碩士<br>國立彰化師範大學<br>電信工程學研究所<br>105<br>Orthogonal frequency division multiplexing (OFDM) technique is used to many wireless communication systems. OFDM system is effective to against frequency selective fading channel and has high spectrum efficiency. In addition, OFDM system needs only simple equalization in receiver. However, OFDM system also has disadvantages. OFDM systems cause high sidelobe interference due to OFDM modulations. Nowadays, the technique of guard band is extensive used to sidelobe interference suppression, but it wastes bandwidth. In this paper, we study the sidelobe interfere

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Chang, Chun-Lin, and 張君臨. "Modified Generalized Sidelobe Canceller with Inverse QRD-RLS Algorithm." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/46246645581826104527.

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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 conventional temporal filtering approach cannot be used to separate signal from interference which occupies the same temporal frequency band as signal. Using a spatial filtering at the receiver can separate signals from interference that originates from different spatial location. Many adaptive array beamforming algorithms, based on linear constraints, have been proposed for suppressing undesired interference and being applied to wireless communication systems for multiuser detection. The adaptive array system can be employed to automatically adjust its d

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Liu, Chia-Liang, and 劉家良. "Studies on Broadband Generalized Sidelobe Canceller with Decision Feedback." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/03367067250380547042.

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碩士<br>國立暨南國際大學<br>通訊工程研究所<br>98<br>Smart antenna is an antenna array system which consists of several antenna elements for processing the received signal. Since there usually exists a number of signal sources in the communication environment, the received signal may contain interference from other spatial directions and the desired signal can be degraded. Here, we consider to employ beamforming techniques to overcome this problem. The structure of generalized sidelobe canceller (GSC) is used to adaptively steer to the received signal, maximize the signal power and suppress the interference and

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Huang, Yi-Min, and 黃逸民. "Sidelobe Suppression and Power Loading for Spectrally Precoded OFDMA." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/98490586248133557986.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>101<br>In this thesis, we combine spectrally precoded orthogonal frequency division multiple access (SP-OFDMA) with specific-band power minimization (SBPM) and power loading (PL) to reduce near-sidelobe power and improve error performance. Spectral precoding (SP) including correlative and orthogonal precoders can endow transmitted signals with fast-sidelobe decaying and thus achieve all-sidelobe suppression. Since the correlative precoder causes high peak-to-average power ratio (PAPR), the orthogonal precoder with relatively lower PAPR is considered in the thesis. H

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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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Chen, Ming-Yuan, and 鄭銘元. "Sidelobe Suppression Using Unequal Power Divider for 2.45GHz Dipole Array Antenna." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/27236779143933524402.

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碩士<br>國立臺灣海洋大學<br>電機工程學系<br>102<br>The aim of this thesis is to design a 2.45GHz dipole array antenna with side lobe and back lobe suppression by using unequal power divider. In the case of a single dipole antenna, the two ports of the dipole antenna were placed on the same side with grounding on the back side, and implemented with a Bulan to generate a phase difference of 180 degrees to facilitate impedance matching and arraying of the antenna to increase the antenna gain. For the array arrangement, quarter wavelength impedance converter was used to satisfy dipole array antenna impedance matc

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Yang, Kai-Jie, and 楊凱傑. "Sidelobe Suppression Using Taylor distribution for 2.45 GHz Patch Array Antenna." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/69090400097791488574.

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碩士<br>國立臺灣海洋大學<br>電機工程學系<br>104<br>The antenna design for Outdoor Customer Premises Equipment (OCPE) application should accommodate long-distance communication needs and have good directivity. In this thesis we designed 1 × 5 array microstrip patch antenna system to illustrate such required features. One array system was designed with uniform distributed power and the simulated first sidelobe level is -12.92 dB. The second array was designed with Taylor’s distributed power so that the first sidelobe level can be preassigned. In this work, we set the first sidelobe level to be -20 dB. The fabri

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Jiang, Jia-Ling, and 江嘉玲. "Cancellation Symbol Insertion Technique for Sidelobe Suppression in OFDM Pilot Waveform." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/nuy5ha.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>107<br>In this thesis, the cancellation symbol insertion (CSI) technique is adopted to suppress the sidelobe power of the OFDM pilot waveform while maintaining the channel estimation (CE) optimality on the quasi-static multipath channel. Different from the conventional CSI technique where the cancellation symbols (CSs) are designed to suppress the sidelobe power of composite OFDM waveforms conveying data and pilot symbols, the proposed CSs depend on pilot symbols only and can be known to the receiver. Hence, the CSs can be used to assist channel estimation when they

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Lin, Chia-Ching, and 林家慶. "Spectral Sidelobe Property of MC-CDMA and OFCDM Signals and Its Applications." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/68949013136642171303.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>97<br>In this thesis, the spectral sidelobe properties of MC-CDMA and OFCDM signals are investigated. Particularly, a general fast-sidelobe-decaying property of the frequency-domain spreading codes is observed to provide small power spectral sidelobes. Given the length of the frequency-domain spreading code, a limitation on the resulted sidelobe-decaying rate is also obtained. It is shown that, by proper arrangements, the spectral sidelobe properties of MC-CDMA or OFCDM signals with (frequency-domain spreading) OVSF and OCG codes can be completely described by their

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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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Chang, Shih-Chang, and 張世昌. "Insertion of Extended Data Carriers for Sidelobe Suppression in CR-OFDM Systems." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/85552866145600381689.

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碩士<br>國立高雄第一科技大學<br>電腦與通訊工程研究所<br>103<br>Cognitive radio with OFDM systems (CR-OFDM) exhibit significant out-of-band radiation by large sidelobe spectrum power of OFDM signals. A lot of existing techniques have been done on suppressing the sidelobe power and numerous methods have been propose. In this thesis, we propose a novel scheme to suppress the sidelobe of signals in the PU spectrum band by insertion of extended carriers. We deploy the extended carriers within secondary user (SU) data frequency spectrum to suppress the sidelobe of signals in the primary user (PU) spectrum band. Furthermo

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HSU, Jeng-Han, and 許正翰. "Robust Two-Dimensional Space-Time Generalized Sidelobe Cancellers Based on The Eigenanalysis Approach." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/16048983566968947134.

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碩士<br>嶺東科技大學<br>資訊科技應用研究所<br>96<br>In recent years, direct-sequence code-division multiple access (DS-CDMA) system and smart antenna have been proposed for implementation of high data rate systems. This thesis deals with robust interference suppression based on generalized sidelobe canceller (GSC) with the eigenanalysis-based estimating techniques for CDMA system under uniform plant array. It has been shown that the GSC possesses the advantage of providing maximal suppressing of interference with fast convergence over conventional beamformers. Based on the corrected steering angle, a proper bl

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