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 194 for “"Ultra-Wideband"”.
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Ultra-wideband digital baseband
The FCC approved the use of Ultra-wideband signals for communication purposes in February 2002 in the band from 3.1GHz to 10.6GHz, effectively opening 7.5GHz of free unlicensed bandwidth. There are two main constraints for the use of this band: a maximum EIRP spectral density of -41.3dBm/MHz and a …
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Design of Ultra-wideband Reflectors
… bandwidth. This thesis investigates how ultra-wideband reflectors can be designed using novel approaches going beyond the conventional approaches listed above. Specifically, we investigate two new methods to design reflectarrays. In the first method, the reflector is designed as a …
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Ultra-Wideband Transceiver Design And Optimization
… This work explores the use of the 802.15 ulta wideband (UWB) standard for designing a radio to operate in the a wireless sensor network in the BAN. The specific application targeted is a hearing aid. However, the design in this work is capable of working in a low power low range application …
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Ultra-Wideband Microwave Imaging Radar System
A novel way to reduce the CPU run time and memory requirement of the nonlinear inverse scattering algorithms is also proposed in this study. We propose a code-division multiplexing scheme for the nonlinear inverse scattering algorithms to reduce the computational complexity by a factor proportional …
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Antenna design for ultra wideband radio
… the Federal Communications Commission (FCC) for Ultra Wideband (UWB) radio applications has presented a myriad of exciting opportunities and challenges for design in the communications arena, including antenna design. Ultra Wideband Radio requires operating bandwidths up to greater than 100% of …
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Synthesis of Ultra-Wideband Array Antennas
Acquisition of ultra-wideband signals by means of array antennas requires essentially frequency-independent radiation characteristics over the entire bandwidth of the signal in order to avoid distortions. Factors contributing to bandwidth limitation of arrays include array factor, radiation …
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Transceiver Design for Ultra-Wideband Communications
Despite the fact ultra-wideband (UWB) technology has been around for over 30 years, there is a newfound excitement about its potential for communications. With the advantageous qualities of multipath immunity and low power spectral density, researchers are examining fundamental questions about UWB …
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Ultra-Wideband Antenna Characterization and Modeling
A new methodology is presented for characterizing an antenna system both in the time and frequency domain with one set of parameters using a singularity expansion method representation. A minimal set of parameter modeling antenna systems using the Matrix-Pencil method has been demonstrated. It has …
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Characterization of Ultra Wideband Communication Channels
Ultra-wideband (UWB) communication has been the subject of extensive research in recent years due to its unique capabilities and potential applications, particularly in short-range multiple access wireless communications. However, many important aspects of UWB-based communication systems have not …
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Directive ultra wideband antenna for medical applications
Since the acceptance of unlicensed band of Ultra-Wideband (UWB) technology in the range between 3.1 and 10.6 GHz, the realization of low-cost UWB wireless systems is considered a fundamental research goal both for military and commercial applications. The possible use and benefits of UWB technology …
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Ultra-Wideband Radar Based Human Motion Analysis
… proposes and investigates two techniques in ultra-wideband (UWB) radar based human motion analysis. The first one is accurate human body landmark detection using UWB radars. The detection is achieved by moving target indication (MTI) and constant false alarm rate detection (CFAR). A new CFAR …
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A micropower ultra-wideband RADAR profiling system
Ultra-wideband (UWB) technology can be used in many applications, including radar, communications, and geo-location. In this dissertation, UWB technology is utilized to directly generate sub-nanosecond pulses with more than 1 GHz bandwidth to implement radio detection and ranging (RADAR) for …
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A platform for ultra wideband communication systems
… was designed. In addition, a platform for Ultra Wideband (UWB) communication development was implemented. The UWB communication platform is implemented to provide a unique testing tool for both transmission and reception of UWB signals. In debugging the system, the UWB communication proved …
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Ultra-Wideband Error Modeling for Improved Localization
Ultra-wideband (UWB) is a modern range measurement technology which can provide high-speed, low-cost ranging, however UWB measurements can be difficult to model. In an effort to increase accuracy of localization using UWB, this thesis develops models to better understand the complex error patterns …
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An FPGA Software-Defined Ultra Wideband Transceiver
Increasing interest in ultra-wideband (UWB) communications has engendered the need for a test bed for UWB systems. An FPGA-based software-defined radio provides both post-fabrication definition of the radio and ample parallel processing power. This thesis presents the FPGA design for a …
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An 8 GHz Ultra Wideband Transceiver Testbed
… presents the digital design for an impulse-based ultra wideband communication system capable of supporting raw data rates of up to 100 MB/s. The transceiver is being developed using software/reconfigurable radio concepts and will be implemented using commercially available off-the-shelf …
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Synchronization in Impulse Based Ultra Wideband Systems
In Impulse Radio based Ultra Wide Band (UWB) systems, where sub-nano second pulses are used, synchronization is very challenging because of their short pulse duration and very low duty cycle. Coherent detection of ultra wide-band signals requires complex channel estimation algorithms. In impulse …
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Ultra-wideband technology for short-range wireless communication
The ultra-wideband (UWB) radio core idea is to open large amounts of spectrum to a variety of users with little mutual interference between them. While ultra-wideband is being championed by several commercial companies, this technology has not followed the conventional path where commercial …
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Improving Ultra-Wideband Localization by Detecting Radio Misclassification
… Fortunately, recent developments in ultra-wideband (UWB) radio technology have enabled precise positioning in places where it was not previously possible by utilizing multipath-resistant wide band pulses.</p> <p>Although ultra-wideband signals are less prone to multipath interference, …
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