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 51 for “"Demodulator"”.
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All Digital FM Demodulator
The proposed demodulator is an all-digital implementation of a FM demodulator. The proposed design intends to implement a FM demodulator for high-speed applications, which makes the requirements for analog components minimal. The proposed circuit is an all-digital quadrature demodulator, where the …
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Low Power Demodulator Design for RFID Applications
… and tracking are the most common. A low power demodulator, part of a RFID transponder operating in the 900 MHz range, is presented using sub-threshold design. Using this technique and working with 90 nm complementary metal-oxide-semiconductor (CMOS) technology, the circuit can operate with a …
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Finding the optimal demodulator under implementation constraints
The common approach of designing a communication device is to maximize a well-defined objective function, e.g., the channel capacity and the cut-off rate. We propose easy-to-implement solutions for Gaussian channels that approximate the optimal results for these maximization problems. Three topics …
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Robust GMSK Demodulation Using Demodulator Diversity and BER Estimation
… 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, and PCS1900). The dissertation begins with a …
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Co-channel interference rejection using a model-based demodulator
… is implemented to create a model-based demodulator for AMPS and NAMPS cellular signals. This algorithm demodulates the signal by estimating the instantaneous frequency of the principle component present. In addition, improved resistance to noise and co-channel interference is gained by …
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Demodulator techniques in satellite communication systems for direct broadcast systems
This thesis is concerned with the FM demodulator techniques used in terrestrial TV receiver designs for Direct Broadcast Systems (DBS) from satellites. The various MAC/Packet schemes intended for DBS applications are described and the international standards that apply to them considered, with …
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Determining signal-to-noise ratio in a burst coherent demodulator
Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
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High performance non-symmetric multi-h CPFSK modulator and demodulator design
… the Fano decoder is highly applicable to the demodulator structure proposed in this thesis and is a preferred alternative to the Viterbi decoder under specific circumstances.
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A Hardware Implementation of a Coherent SOQPSK-TG Demodulator for FEC Applications
… thesis presents a hardware design of a coherent demodulator for shaped offset quadrature phase shift keying, telemetry group version (SOQPSK-TG) for use in forward error correction (FEC) applications. Implementation details for data sequence detection, symbol timing synchronization, carrier phase …
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Comparison of quadrature detector and phase-locked loop demodulator performance with LEOSAT applications
… a quadrature detector and a phase-locked loop demodulator shows that phase-locked loop demodulators and quadrature detectors offer equivalent performance as demodulators at low carrier to noise ratios for narrowband FM/CPFSK systems. This contrasts with earlier work that shows that phase-locked …
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Design, simulation, and implementation of a digital quadrature demodulator for a stepped frequency radar
… and implementation of a digital quadrature demodulator for a stepped frequency ground penetrating radar. This dissertation presents a theoretical model of the demodulator, simulations characterising the demodulator performance as well as the design, construction, and measurement of the …
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Design and Characterization of a Current Assisted Photo Mixing Demodulator for Tof Based 3d Cmos Image Sensor
… signal. One very promising CMOS photonic demodulator based on substrate current modulation has recently been proposed. In this device the electric field penetrates deeper into the substrate, thus enhancing the charge separation and collection mechanism. A very good sensitivity and high …
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Performance analysis of a multistage multicarrier demultiplexer/demodulator (M-MCDD) in the presence of interference and quantization error
… of several proposed multicarrier demultiplexer/demodulator (MCDD) structures is studied for application to satellite on-board regenerative repeats. The structure considered here is the multistage multicarrier demultiplexer/demodulator (M-MCDD). The M-MCDD has been chosen as the preferred …
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Digital frequency demodulation for a laser vibrometer
… the design and simulation of a digital frequency demodulator applied to a Michelson interferometer-based scanning laser vibrometer. The laser vibrometer is a velocity transducer that produces frequency-modulated signals that have traditionally been optically or electronically frequency shifted …
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Multi-h synchronisation for codes with long constraints-length
… potential is the new Massey-Hodgart coherent MSK demodulator. In a significant departure from standard quadrature structures, this MSK demodulator uses matched filter detection with a pair of reference signals at the two MSK signaling frequencies; an optimal maximum-likelihood bit decision is then …
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Advanced applications in wide-area impedance sensing
… used with a spectrum analyzer and synchronous demodulator for source and material detection respectively. A setup for active source multiplexing is described and used in image reconstruction and material detection. Algorithms for image reconstruction from such ill-posed inverse problems are …
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GRAND-assisted Optimal Modulation
… literature. A guess-based error correction demodulator lies at the core of the proposed system. Together with the padding scheme of our choice, our novel light-weight variant of Guessing Random Additive Noise Decoding (GRAND) demodulator protects the system against insertions and deletions. …
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An analysis of threshold characteristics of quasi-linearized phase-locked loop demodulation for wideband frequency-modulated signals
… 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 threshold criterion by the characteristics of maximum …
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