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 18 of 18 for “"pulse position modulation"”.
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An enhanced pulse position modulation (PPM) in ultra-wideband (UWB) systems
1 PDF file (ix, 60 pages)
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Importance sampling simulation of free-space optical APD pulse position modulation receivers
Free-space optical communication technology has many advantages over RF/microwave in satellite and other spacecraft applications where reductions in size, weight and prime power requirements are combined with increased data transfer capability over long distances. Ultimately, the design and …
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Enhancing the bit error rate performance of ultra wideband systems using time-hopping pulse position modulation in multiple access environments
… communications, networking, radar, imaging, and positioning systems. A major challenge when designing UWB systems is choosing a suitable modulation technique. Data rate, transceiver complexity, and BER performance of the transmitted signal are all related to the employed modulation scheme. …
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Experimental designs for efficient free-space multi-spatial-mode optical communication
… spectral efficiency, however, is spatial pulse-position- modulation (spatial-PPM), in which information is encoded into the spatial modes of light and sent through free space between transmitter and receiver. This thesis aims to lay the groundwork for an experimental design to achieve …
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Design of sparse signaling schemes in fading wideband channels
… has resulted in a requirement for a different modulation scheme from previously used modulation schemes in order to succeed. Impulsive frequency shift keying, which is frequency shift keying with a duty cycle, is one such signaling scheme that has been shown to perform better than code division …
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Semiconductor-based all-optical switching for optical time-division multiplexed networks
… optical signal. We propose the use of pulse-position modulation (PPM) as a means for mitigating gain saturation effects in SOA-based optical processors. We present techniques for modulation and detection of optical PPM signals at data rates in excess of 100 Gbit/s. We demonstrate …
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Performance analysis for near-field atmospheric optical communications
… regime, utilizing on-off keying (OOK) or pulse position modulation (PPM) signaling techniques. We also obtain bounds on the capacity of a single-input, single-output (SISO) atmospheric optical communication link with a coherent-detection receiver operating in the near field.
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Pulse compression applied to the detection of F.S.K. and P.S.K. signals
… are investigated. The new approach utilizes pulse compression techniques, well known in radar systems, to facilitate the implementation of the matched filter in the form of the Pulse Compressor Matched Filter (P.C.M.F.). Both detection schemes feature a mixer- P.C.M.F. Compound as their …
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Radio over fibre distribution systems for ultra-wide band and millimetre wave applications
… techniques are based on generating Gaussian pulse position modulation (PPM) using a gain switched laser (GSL). The simulation and experimental results have been carried out to show the suitability of employing gain switching in UWB over fibre systems (UWBoF) to develop a reliable, simple, and …
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New d-piso architecture for dynamic symbol size digital baseband modulation implementation in FPGA
Dynamic symbol size modulation is a type modulation which could provide a fast transmission speed by removing the redundant symbol as compare to fixed symbol size modulation. The dynamic nature of the symbol created an additional problem in hardware design as the size of symbol needed to be defined …
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Ultra-wideband technology for short-range wireless communication
… fundamental properties of communications with impulse-based radio UWB signals. We study jam resistance and capacity of UWB. Jam resistance is analyzed for binary pulse position modulation (PPM) with the interference being modeled as correlated Gaussian. Closed-form expressions are provided for …
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Simulation, performance and interference analysis of multi-user visible light communication systems
… “white” LEDs, and under PSK and QAM modulation. Two scenarios are used in the validation of the VLC module: (i) using a receiver placed right bellow the transmitter with varying range, and (ii) using a receiver with a fixed range and varying angle of acceptance. Results indicate good …
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Investigation of the pulse time modulation techniques for transmission of wideband signals
The choice of the modulation format is the principle factor in realising a highperformance bandwidth efficient communication system at an acceptable cost and complexity. Pulse time modulation technique represents an attractive alternative to purely digital or purely analogue modulation schemes …
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Scenario-based uncertainty quantification for deep space optical communications
… to estimate laser data transmission using Pulse Position Modulation protocol. The study develops a cost proxy model of component costs, revealing the cost-effectiveness of segmented mirror antennas. Evaluating 3000 designs for each planet scenario and architecture, statistical analyses …
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Digital pulse interval modulation for indoor optical wireless communication systems
… The work presented in this thesis focuses on modulation techniques, the fundamental aim being to assess the suitability of digital pulse interval modulation (DPIM) for use in indoor optical wireless communication systems.</p> <p>Infrared transceivers are subject to eye safety regulations, and …
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A jam-resistant CubeSat communications architecture
… develops the channel coding, interleaving, modulation, and framing approach employed in the NODE waveform to provide error-free communications. A Reed-Solomon code, selected because of its performance and the existence of open-source implementations, provides error-correction capabilities. …
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Transceiver Design for Ultra-Wideband Communications
… on a software radio transceiver design for impulse-based UWB with the ability to transmit a raw data rate of 100 Mbps yet encompasses the adaptability of a reconfigurable digital receiver. A 500 ps wide Gaussian pulse is generated at the transmitter utilizing the fast-switching characteristics …
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On the Development of a Very Fast Simulator for TH-UWB Systems = Sobre el Desarrollo de un Simulador Rápido para los Sistemas TH-UWB
Impulse Radio-Time Hopping-Ultra Wideband (IR-TH-UWB) is a relatively new technology that might have a big effect on improving wireless communication. Multipath resistance, low power, high capacity, coexistence with other systems, ability of penetrating walls are some of the characteristics that …