Rozprawy doktorskie na temat „Digital modulation”
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Erdem, Erem. "Digital Modulation Recognition". Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12611281/index.pdf.
Pełny tekst źródłaOzturk, Uygar. "Chaotic Digital Modulation And Demodulation". Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12606895/index.pdf.
Pełny tekst źródłaShankar, Udaya. "Implementation of digital modulation techniques using direct digital synthesis". Master's thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-03302010-020333/.
Pełny tekst źródłaKempson, C. N. "Statistical techniques for digital modulation recognition". Thesis, Cranfield University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277938.
Pełny tekst źródłaRamakonar, Visalakshi S. "Modulation classification of digital communication signals". Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2002. https://ro.ecu.edu.au/theses/752.
Pełny tekst źródłaArani, Faramarz Shayan. "Trellis coded modulation techniques". Thesis, University of Warwick, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387324.
Pełny tekst źródłaDoerr, Michael B., William H. Jr Hallidy, Gary B. McMillian, Lawrence W. Jr Burke i Jonah N. Faust. "Digital FDM for the HSTSS DAC Program". International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/608712.
Pełny tekst źródłaThis paper presents the design of an innovative approach to Frequency Division Multiplexing (FDM) for the STRICOM Hardened Subminiature Telemetry and Sensor System (HSTSS) Data Acquisition Chipset (DAC) program. An ASIC (Application Specific Integrated Circuit) is being developed by Systems & Processes Engineering Corporation (SPEC) that implements this new digital FDM approach for telemetry applications. The FDM ASIC provides six channels that are IRIG-106 compatible, and may be used in conjunction with a Delay/Repeater ASIC. Together these ASICs make a complete instrumentation system for those applications requiring very small size, simplicity of use, and low cost, e.g. munitions/armament testing.
Han, Yu. "Optimization of Modulation Constrained Digital Transmission Systems". Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37097.
Pełny tekst źródłaSandberg, Sara. "Modulation and channel effects in digital communication /". Luleå : Luleå University of Technology, 2005. http://epubl.luth.se/1402-1757/2005/49.
Pełny tekst źródłaWong, Dennis Mou Ling. "Automatic classification of digital communication modulation schemes". Thesis, University of Liverpool, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.400128.
Pełny tekst źródłaPhillips, Andrew Julian. "Optically amplified digital pulse position modulation systems". Thesis, Manchester Metropolitan University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260069.
Pełny tekst źródłaHarrold, William. "Detection of continuous phase modulation". Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235856.
Pełny tekst źródłaDong, Adam Xuesi Carleton University Dissertation Engineering Electrical. "Incorporation of digital angle-modulation into a fractional division synthesizer". Ottawa, 1992.
Znajdź pełny tekst źródłaWebb, William. "QAM techniques for digital mobile radio". Thesis, University of Southampton, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385448.
Pełny tekst źródłaGrewal, Sukhminder Singh. "Digital signal processor implementation of novel PWM strategies". Thesis, University of Bristol, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246284.
Pełny tekst źródłaHatzichristos, George. "Classification of digital modulation types in multipath environments". Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2001. http://handle.dtic.mil/100.2/ADA390810.
Pełny tekst źródłaOkman, Osman Erman. "Quantization Index Modulation Based Watermarking Using Digital Holography". Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607506/index.pdf.
Pełny tekst źródłaJantzi, Stephen A. "Quadrature bandpass delta-sigma modulation for digital radio". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ27669.pdf.
Pełny tekst źródłaBax, Walter T. "Modulation and frequency synthesis for wireless digital radio". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0019/NQ48341.pdf.
Pełny tekst źródłaHashimi, Seyed Bahauddin. "Coded modulation techniques for digital mobile communication systems". Thesis, Staffordshire University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321787.
Pełny tekst źródłaKaluarachchi, Eraj Dulip. "Digital pulse interval modulation for optical communication systems". Thesis, Sheffield Hallam University, 1997. http://shura.shu.ac.uk/9101/.
Pełny tekst źródłaCryan, Robert Anthony. "High sensitivity optical digital pulse position modulation systems". Thesis, University of Huddersfield, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306086.
Pełny tekst źródłaYoung, Andrew F. "Classification of digital modulation types in multipath environments". Thesis, Monterey California. Naval Postgraduate School, 2008.
Znajdź pełny tekst źródłaAs the digital communications industry continues to grow and evolve, the applications of this discipline continue to grow as well. This growth, in turn, has spawned an increasing need to seek automated methods of classifying digital modulation types. This research is a revision of previous work, using the latest mathematical software including MATLAB version 7 and Simulink ®. The program considers the classification of nine different modulation types. Specifically, the classification scheme can differentiate between 2, 4, and 8 PSK, 256-QAM from other types of M-QAM signals, and also M-FSK signals from PSK and QAM signals in various types of propagation channels, including multipath fading and a variety of signal-to-noise levels. This method successfully identifies these modulation types without the benefit of a priori information. Higher-order statistical parameters are selected as class features and are tested in a classifier for their ability to identify the above modulation types. This study considers the effects due to realistic multipath propagation channels and additive white Gaussian noise. Using these features, and considering all fading conditions, it was determined that the classifier was correct for a randomly sent signal under randomly high or low SNR levels (low: 0dB to 8dB; high: 50dB to 100dB) over 83.9% of the time.
Calvert, N. "An optical fibre digital pulse position modulation system". Thesis, University of Huddersfield, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382254.
Pełny tekst źródłaSchoonees, Johann August. "A likelihood ratio analysis of digital phase modulation". Doctoral thesis, University of Cape Town, 1998. http://hdl.handle.net/11427/19508.
Pełny tekst źródłaAlthough the likelihood ratio forms the theoretical basis for maximum likelihood (ML) detection in coherent digital communication systems, it has not been applied directly to the problem of designing good trellis-coded modulation (TOM) schemes. The remarkably simple optimal receiver of minimum shift keying (MSK) has been shown to result from the mathematical simplification of its likelihood ratio into a single term. The log-likelihood ratio then becomes a linear sum of metrics which can be implemented as a so-called simplified receiver, comprising only a few adders and delay elements. This thesis project investigated the possible existence of coded modulation schemes with similarly simplifying likelihood ratios, which would have almost trivially simple receivers compared to the Viterbi decoders which are typically required for maximum likelihood sequence estimation (MLSE). A useful notation, called the likelihood transform, was presented to aid the analysis of likelihood ratios. The work concentrated initially on computer-aided searches, first for trellis codes which may give rise to simplifying likelihood ratios for continuous phase modulation (CPM), and then for mathematical identities which may aid in the simplification of generic likelihood ratios for equal-energy modulation. The first search yielded no simplified receivers, and all the identities produced by the second search had structures similar to the likelihood ratio of MSK. These observations prompted a formal proof of the non-existence of simplified receivers which use information from more than two symbols in their observation period. This result strictly bounds the error performance that is possible with a simplified receiver. It was also proved that simplified receivers are only optimal for modulation schemes which use no more than two pairs of antipodal signals, and that only binary modulation schemes can have simplified receivers which use information from all the symbols in their observation period.
Bax, Walter T. (Walter Timothy) Carleton University Dissertation Engineering Electronics. "Modulation and frequency synthesis for wireless digital radio". Ottawa, 1999.
Znajdź pełny tekst źródłaBullard, Jason Mark. "New modulation technique to improve supply ripple rejection of a digital pulse width modulator". [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0007548.
Pełny tekst źródłaGendron, Paul John. "A comparison of digital beacon receiver frequency estimators". Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-09292009-020307/.
Pełny tekst źródłaThorlby, J. Paul. "Equalisation techniques for coded modulation". Thesis, University of York, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338549.
Pełny tekst źródłaLi, Xiaodong. "Bandwidth-efficient coded modulation and iterative decoding /". Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/6017.
Pełny tekst źródłaGhate, Dilip B. "Implementation of a digital communication system using QPSK modulation". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA305334.
Pełny tekst źródłaStark, Stefan. "Direct Digital Pulse Width Modulation for Class D Amplifiers". Thesis, Linköping University, Department of Electrical Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8476.
Pełny tekst źródłaClass D amplifiers are becoming increasingly popular in audio devices. The strongest reason is the high efficiency which makes it advantageous for portable battery-driven products.
Infineon Technologies is developing products in this area, and has recently filed a patent application regarding an implementation of a part of the class D amplifier. The aim of this Master’s thesis is to evaluate a digital open-loop implementation of a class D amplifier, using the pending patent solution, and discuss the differences from an analog closed-loop implementation.
The focus has been on generating a high resolution PWM signal with a relatively low clock frequency. To achieve this, a hybrid of a counter and a self-calibrating tapped delay-line are used as a pulse generator. A model of the pulse generator was developed which made it possible to study how sampling frequency and different types of quantization affected quality parameters such as THD and SNR. With the results from the model two systems were implemented and simulated in HDL and as circuit schematics.
The proposed digital open-loop class D amplifier was found to be useful in voice-band applications and for music. Since the open-loop structure suffers from poor rejection of power supply ripple, either error correction or a regulated power supply is needed. If much effort is put on the different parts of the amplifier the result can be really good but, depending on other constraints on the system, it may be simpler and less time consuming to use the analog circuit with feedback to achieve hi-fi quality.
In summary, the combination of a counter and a self-calibrating tapped delay-line as a pulse generator is very useful in high resolution low-power systems. To avoid errors the delay-line and calibration can be made very accurate but with the expense of higher power consumption and area. However, the technique benefits from the small and fast logic devices available in deep sub-micron process technologies, which may finally lead to an advantage in power consumption and cost over the closed-loop analog solution.
Sieben, Michael James. "Single sideband modulation for digital fiber optic communication systems". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0024/NQ34832.pdf.
Pełny tekst źródłaEsslinger, Rolf. "One-bit Sigma-Delta Modulation for digital power amplifiers". Thesis, University of Strathclyde, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401393.
Pełny tekst źródłaTorrance, Jeffrey Mark. "Adaptive full response digital modulation for wireless communication environments". Thesis, University of Southampton, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242748.
Pełny tekst źródłaJacobs, Deon. "Digital pulse width modulation for Class-D audio amplifiers". Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019.1/1574.
Pełny tekst źródłaDigital audio data storage mediums have long been used within the consumer market. Today, because of the advancement of processor clock speeds and increased MOSFET switching capabilities, digital audio data formats can be directly amplified using power electronic inverters. These amplifiers known as Class-D have an advantage over there analogue counterparts because of their high efficiency. This thesis deals with the signal processing algorithms necessary to convert the digital audio data obtained from the source to a digital pulse width modulated signal which controls a full bridge inverter for audio amplification. These algorithms address difficulties experienced in the past which prevented high fidelity digital pulse width modulators to be implemented. The signal processing algorithms are divided into modular blocks, each of which are defined in theory, designed and simulated in Matlab® and then implemented within VHDL firmware. These firmware blocks are then used to realize a Class-D audio amplifier.
Verdin, Dan. "Synchronisation in sampled receivers for narrowband digital modulation schemes". Thesis, University of York, 1995. http://etheses.whiterose.ac.uk/10839/.
Pełny tekst źródłaFortune, P. M. "Multi-level modulation schemes for digital cellular mobile radio". Thesis, University of Southampton, 1988. https://eprints.soton.ac.uk/421471/.
Pełny tekst źródłaWu, Xiping. "Wireless communication systems based on spatial modulation MIMO". Thesis, University of Edinburgh, 2015. http://hdl.handle.net/1842/10505.
Pełny tekst źródłaGray, Andrew, Meera Srinivasan, Marvin Simon i Tsun-Yee Yan. "FLEXIBLE ALL-DIGITAL RECEIVER FOR BANDWIDTH EFFICIENT MODULATIONS". International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/608745.
Pełny tekst źródłaAn all-digital high data rate parallel receiver architecture developed jointly by Goddard Space Flight Center and the Jet Propulsion Laboratory is pre- sented. This receiver utilizes only a small number of high speed components along with a majority of lower speed components operating in a parallel fre- quency domain structure implementable in CMOS, and can process over 600 Mbps with numerous varieties of QPSK modulation, including those incorpo- rating precise pulse shaping for bandwidth eÆcient modulation. Performance results for this receiver for bandwidth eÆcient QPSK modulation schemes such as square-root raised cosine pulse shaped QPSK and Feher’s patented QPSK are presented, demonstrating the great degree of exibility and high performance of the receiver architecture.
Tuthill, John D. "Frequency dependent digital compensation in DSP based FM modulators". Thesis, Curtin University, 2000. http://hdl.handle.net/20.500.11937/797.
Pełny tekst źródłaAldera, Mario Antonio. "A study of the minimum shift keying modulation scheme". Master's thesis, University of Cape Town, 1988. http://hdl.handle.net/11427/21863.
Pełny tekst źródłaChindapol, Aik. "Evaluation of improved designs for two-dimensional bit-interleaved coded modulation with iterative decoding in fading channels /". Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/5992.
Pełny tekst źródłaHorley, Niall. "Advanced practical coding and modulation techniques for time varying channels". Thesis, Lancaster University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387440.
Pełny tekst źródłaGarcia, Julian. "Digitally Enhanced Continuous-Time Sigma-Delta Analogue-to-Digital Converters". Doctoral thesis, KTH, Integrerade komponenter och kretsar, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-95447.
Pełny tekst źródłaQC 20120528
Geisinger, Nathan P. "Classification of digital modulation schemes using linear and nonlinear classifiers". Thesis, Monterey, California : Naval Postgraduate School, 2010. http://edocs.nps.edu/npspubs/scholarly/theses/2010/Mar/10Mar%5FGeisinger.pdf.
Pełny tekst źródłaThesis Advisor(s): Fargues, Monique P. ; Cristi, Roberto ; Robertson, Ralph C. "March 2010." Description based on title screen as viewed on .April 27, 2010. Author(s) subject terms: Blind Modulation Classification, Cumulants, Principal Component Analysis, Linear Discriminant Analysis, Kernel-based functions. Includes bibliographical references (p. 211-212). Also available in print.
Van, Wyk Daniel Jacobus. "Four-dimensional Q2PSK modulation and coding for mobile digital communication". Pretoria : [s.n.], 2000. http://upetd.up.ac.za/thesis/available/etd-10272005-122450.
Pełny tekst źródłaCaouras, 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.
Pełny tekst źródłaHayes, Andrew Robert. "Digital pulse interval modulation for indoor optical wireless communication systems". Thesis, Sheffield Hallam University, 2002. http://shura.shu.ac.uk/7263/.
Pełny tekst źródłaWang, Y. "Linecoded digital pulse position modulation for repeatered optical fibre telecommunications". Thesis, University of Essex, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376832.
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