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 794 for “"Transmitter"”.
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Transmitter Authentication in Dynamic Spectrum Sharing
… to the increased possibility of "rogue" transmitter radios which may cause significant interference to other radios in DSS. One approach for countering such threats is to employ a transmitter authentication scheme at the physical (PHY) layer. In PHY-layer authentication, an authentication …
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Optimal transmitter placement in wireless mesh networks
Wireless mesh networks are systems of wireless access points interconnected in a mesh to provide digital services to client devices via radio transmission. We consider the challenges of quickly and optimally designing a wireless mesh network. We focus on maximizing client coverage area by choice of …
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A multi-protocol quantum key distribution transmitter
… comes with different requirements on the transmitter and receiver. Even within a single protocol, different clock rates can require individualised transmitter and receiver hardware. This prohibits users from communicating with all receivers, unless they have complex transmitters with …
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An acoustic study of the Blake transmitter
Thesis: B.S., Massachusetts Institute of Technology, Department of Physics, 1891
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Channel Estimation for OFDM Systems With Transmitter Diversity
… because of its inherent equalisation simplicity. Transmitter diversity can effectively combat multipath channel impairments due to the dispersive wireless channel that can cause deep fades in some subchannels. The combination of the two techniques, OFDM and transmitter diversity, can further …
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Transmitter precoding for multi-antenna multi-user communications
… In a broadcast channel, where a central transmitter is transmitting independent streams to decentralized receivers, it is possible for the transmitter to have a priori knowledge of the interference. Multiple antennas can be used at the transmitter to enhance energy efficiency. In some …
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Energy-efficient wireless transmitter architecture for mobile multimedia
… limit on the peak energy-efficiency of wireless transmitters. Nevertheless, the average efficiency with mobile multimedia communication is decreasing due to escalating design requirements on linearity and bandwidth. Therefore there is an increasing gap between the peak and average efficiency. …
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Transmitter Design in a Commercial Marine, Single-Sideband Transceiver
Design of the transmitter portion of a solid state, state of- the-art, single -sideband, 2-17 MHz transceiver is presented. A short discussion of the theory of single sideband and a comparison of single sideband systems with amplitude modulated systems are also presented. The unique requirements of …
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Enabling and directing real-time cognitive radar transmitter optimization.
… research has demonstrated how to optimize radar transmitters using adjustable amplifier matching networks, such optimizations have not been able to complete quickly enough for use in real-time adaptation. To accelerate these optimizations, this dissertation presents a faster method for evaluating …
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Digitally enhanced CMOS RF transmitter with integrated power amplifier
… energy-efficient, 3.5 GHz, direct-conversion RF transmitter with integrated 23 dBm, Class-B power amplifier (PA) is fabricated in a 0.13 μm CMOS process. The TX chip is packaged using a low-cost chip-on-board (COB) technique. When 20-MHz bandwidth OFDM signals are transmitted, a high TX average …
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Coil antenna design for transmitter and receiver for bioelectronics
… power transfer between the devices and the transmitter. The wireless sensor network based on a near-field communication (NFC) increases the capability of the devices with a great power efficiency. This thesis shows an inductive link of the coil antenna designs that present a wireless power …
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An all-digital transmitter for pulsed ultra-wideband communication
… UWB signaling greatly simplifies both transmitter and receiver implementations, offering additional energy savings. This thesis presents an all-digital transmitter designed for a non-coherent pulsed UWB system. By exploiting relaxed center frequency tolerances in non-coherent wideband …
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A fully-integrated all-digital outphasing transmitter for wireless communications
… is to present a new all-digital outphasing transmitter IC, a comprehensive explanation of its operation, and its performance characterization. The all-digital transmitter chip leverages flexible digital phase modulators (DPMs) to adaptively compensate for amplifier mismatches. As the DPM …
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Global Optimization of Transmitter Placement for Indoor Wireless Communication Systems
… optimization, has been applied to the optimal transmitter placement for indoor wireless systems. Power coverage and BER (bit error rate) are considered as two criteria for optimizing locations of a specified number of transmitters across the feasible region of the design space. The performance …
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Digitally Assisted Transmitter Enhancement Techniques for Millimeter Wave Radio Systems
… enhance performance of wideband radio frequency transmitters. A section of the work focusses on characterizing wideband impairments in radio frequency hardware and mitigating them through digital signal processing. Another section devises digital signal processing operations to jointly enhance …
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Spectral Shape Division Multiplexing (SSDM): Apparatus, Transmitter, Receiver and Detection
<p>Wireless communication companies require to use the frequency spectrum to operate. Both frequency licenses and infrastructure to reuse frequencies are costly resources subject to increasing demand. This work introduces a novel multiplexing method that saves spectrum called Spectral Shape …
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A Robust Power-Scalable Transmitter Architecture for Wireless Body Area Networks
In this dissertation, an RF transmitter is presented that uses closed-loop PLL- based BFSK modulation and is reconfigurable for both the MedRadio and 433 MHz ISM bands. A power efficient class-C amplifier is utilized and the design methodologies for designing a highly efficient and low-power …
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Applying Universal Verification Methodology on a Universal Asynchronous Receiver/ Transmitter design
Universal asynchronous receiver/ transmitter (UART) is a computer hardware device that is used to transform user data to parallel and serial forms. The UART protocol is typically integrated in an Integrated Circuit (IC) which is used for serial communication over a computer or a peripheral device. …
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