Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 152 for “"demodulation"”.
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Motion-compensated NTSC demodulation
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1989.
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FPGA-based DOCSIS upstream demodulation
In recent years, the state-of-the-art in field programmable gate array (FPGA) technology has been advancing rapidly. Consequently, the use of FPGAs is being considered in many applications which have traditionally relied upon application-specific integrated circuits (ASICs). FPGA-based designs have …
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On Sequential Pulse Position Demodulation
Made available in DSpace on 2014-12-12T20:54:16Z (GMT). No. of bitstreams: 1 7606918.pdf: 1847411 bytes, checksum: 1dd8ed113ec2f4525780f4a55347b37c (MD5) Previous issue date: 1975
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Digital demodulation techniques for radio channels
… evaluation of demodulator performance. Existing demodulation techniques were reviewed, with several of these simulated to find the most appropriate demodulation scheme for this application. This included the development of a new detection scheme. A test system using Digital Signal Processing …
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Emona-based interactive amplitude modulation/demodulation iLab
The MIT iLab Project has developed online laboratories (iLabs) which are lab stations that can be accessed and controlled remotely over the Internet. With iLabs, students can conduct real experiments on real equipment over the Internet. With the introduction of the National Instrument's Educational …
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Digital frequency demodulation for a laser vibrometer
… demonstrates its superiority over other digital demodulation techniques. In addition some specialized signal processing to handle the special case of sine-dwell vibration tests is presented.
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Amplitude and frequency demodulation controller for MEMS accelerometer
… Vector Readout method of amplitude and frequency demodulation is described and shown to be a high precision, environmentally stable method of demodulation. The Vector Readout method of demodulation uses a Hilbert Transform filter and the CORDIC algorithm to simultaneously estimate both the …
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Neural Networks For Phase Demodulation In Optical Interferometry
… evenly spaced wavenumbers. Traditional phase demodulation algorithms for WSI fail to reach the theoretical OPL sensitivity limit set by the CRB. We have designed NNs which are capable of achieving this bound across a wide range of OPL differences. The NNs are trained on simulated data, and …
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Robust GMSK Demodulation Using Demodulator Diversity and BER Estimation
This research investigates robust demodulation of Gaussian Minimum Shift Keying (GMSK) signals, using demodulator diversity and real-time bit-error-rate (BER) estimation. GMSK is particularly important because of its use in promi- nent wireless standards around the world (GSM, DECT, CDPD, DCS1800, …
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Simulation of quadrature amplitude demodulation in a digital telemetry system
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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A Doppler Radar Lock-in Demodulation Algorithm for Machine Vibration Sensing
Data-driven predictive maintenance of modern machinery has the potential to increase equipment lifespan and decrease manufacturing costs. Among various condition monitoring techniques, vibration analysis can effectively diagnose potential problems in machines. Doppler radar can be used as a sensor …
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A Model-Based Approach to Demodulation of Co-Channel MSK Signals
… we have developed model-based techniques for the demodulation of co-channel MSK signals. It is shown that MSK signals can be written in the linear model form, hence a minimum variance unbiased (MVU) estimator exists that satisfies the Cramer-Rao lower bound (CRLB) with equality. This framework …
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Small satellite optical communication receiver for simultaneous spatial tracking and data demodulation
Free-space optical communications in space offer many benefits over established radio frequency based communication links; in particular, high beam directivity results in efficient power usage. Such a reduced power requirement is particularly appealing to small satellites with strict size, weight …
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Design and prototype of an all digital system for baseband FM multiplex signal demodulation
… analog circuits is in the modulation and demodulation of baseband frequency modulated (FM) radio signals. In this project, an all digital system for demodulating baseband FM Multiplex (MPX) signals is simulated, designed, and prototyped on a Xilinx Spartan-3AN FPGA. The design architecture …
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Integrated Signal Demodulation, Data Conversion, and Packaging Strategies for a Wireless, Fully Implantable, Bidirectional Neural Interface
… required for the implantable platform. A compact demodulation and decoding scheme for the wired interface between the implantable hub and the distributed neural front-ends is presented, enabling simultaneous power and data trans- mission over a four-wire connection through amplitude-modulated …
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An analysis of threshold characteristics of quasi-linearized phase-locked loop demodulation for wideband frequency-modulated signals
An analytical threshold criterion in approximation has been developed for the basic phase-locked loop demodulator utilizing quasi-linearization technique. The analysis is based on assumptions that the loop is excited by an input FM signal and additive white Gaussian noise. This paper defines the …
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Fiber-Optic Michelson Interferometer with Faraday Mirrors for Acoustic Sensing using a 3 × 3 Coupler and Symmetric Demodulation Scheme
… as the beamsplitting component, and a symmetric demodulation algorithm is applied to recover the phase signal. This sensor has a theoretical resolution of 5.5 pico-strains and room to improve. Such improvements are discussed in the conclusion.
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Wavelet Modulation in Gaussian and Rayleigh Fading Channels
… We show that bit error rate (BER) wavelet demodulation performance in the additive, white, Gaussian noise (AWGN) channel is comparable to theoretical binary phase shift keying. Our results depict the improvement in performance that can be realized for time varying channels by utilizing the …
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Extrinsic Fabry-Perot Interferometer System Using Wavelength Modulated Source
… but they suffer from limitations in signal demodulation caused by phase ambiguity and complex fringe counting when the output phase difference exceeds one fringe period. Various signal demodulation methods have been developed to overcome some of the these drawbacks with limited success. This …
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Investigation into variable shift keying using direct sequence spread spectrum techniques
… carrier synchronization and hence coherent demodulation in the receiver. VPSK is a new and relatively unknown modulation scheme in which data bits are encoded using patented algorithms designed by Millerand Walker. VPSK modulation is a SSBSC (Single Sideband Suppressed Carrier) modulation …
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