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 234 for “"Wireless systems"”.
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Embracing interference in wireless systems
The wireless medium is a shared resource. If nearby devices transmit at the same time, their signals interfere, resulting in a collision. In traditional networks, collisions cause the loss of the transmitted information. For this reason, wireless networks have been designed with the assumption that …
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Interference mitigation in colocated wireless systems
The placement of base station transceivers at close proximity to one another is a major challenge for RF engineers. In a colocated setting, the base station receivers have to receive weak desired signals in the presence of high-power transmit/jamming signals from colocated base station …
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Wireless systems for the fourth generation
… are becoming higher and higher. Therefore, new systems and technologies are necessary to move towards the market needs and the user requirements. This has driven the development of fourth generation networks. ”Wireless network for the fourth generation” is the expression used to describe the …
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Wireless systems that extend our senses
Wireless signals, such as Wi-Fi, are traditionally used for communications. In this thesis, we show that these signals can also be used as sensing tools that enable us to learn about our environment without physically reaching out to the various objects in it. Specifically, as these signals travel …
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Integrating spinal codes into wireless systems
… codes [47] promise performance gains for future wireless systems. These gains can be realized in the form of higher data rates, longer operational ranges, reduced power consumption, and greater reliability. This is due in part to the manner in which rateless codes exploit the instantaneous …
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Multicarrier Wireless Systems with Adaptive Decision Combining
… Frequency Division Multiplexing (OFDM) systems with decision combining are considered in this thesis. It is shown that such systems can provide enhanced bit error rates. However, this occurs at the cost of data throughput of the system. The typical system considered essentially involves …
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Coexistence of Wireless Systems for Spectrum Sharing
… frequencies in the radio spectrum among multiple wireless systems has emerged as a viable solution for alleviating the severe capacity crunch in next-generation wireless mobile networks such as 5th generation mobile networks (5G). Spectrum sharing can be achieved by enabling multiple wireless …
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SCHEDULING IN PACKET SWITCHED CELLULAR WIRELESS SYSTEMS
In cellular wireless networks where users have independent fading channels, throughput for delay tolerant applications has been greatly increased on the downlink by using opportunistic schedulers at the base station. These schedulers exploit the multiuser diversity inherent in cellular systems. An …
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Low power scalable encryption for wireless systems
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Security and Privacy Analysis of Embedded Wireless Systems
<p>Continued advancement in wireless embedded systems design and hardware integration has introduced us to a world where such devices are an integral part of the modern citizen's life. Due to this proliferation in usage, wireless embedded devices demand a thorough study into their security and …
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Cloud-aided wireless systems: communications and radar applications
… Radio Access Network (C-RAN), and for radar systems. This dissertation first concentrates on cloud-aided communications. Mobile cloud computing, which allows mobile users to run computationally heavy applications on battery limited devices, such as cell phones, is considered initially. Mobile …
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Statistical Analysis of Wireless Systems Using Markov Models
… of the fastest growing fields of engineering, wireless has gained the attention of researchers and commercial businesses all over the world. Extensive research is underway to improve the performance of existing systems and to introduce cutting edge wireless technologies that can make high speed …
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Circuits and protocols for low duty cycle wireless systems
… in severely energy-constrained applications. Wireless communication, which consumes a large fraction of the power in these devices, is the primary focus of this thesis. We present circuit (active RF, leakage management and timing) and protocol (medium access and coding) techniques for total …
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Timing and frequency synchronization in OFDM broadband wireless systems
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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Unconventional Optical Phased Array Design for Next-Generation Wireless Systems
This thesis focuses on the design, analysis, and performance characterization of thinned optical phased arrays (OPAs), aiming to achieve high-quality far-field beamforming and near-field focusing through a multi-objective (MO) optimization framework. The method addresses the challenge of selecting …
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Contributions On Theory And Practice For Multi-Mission Wireless Systems
<p>The field of wireless systems has long been an active research area with various applications. Recently much attention has been given to multi-mission wireless systems that combine capabilities including information sensing, data processing, energy harvesting as well as the traditional data …
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Secure Machine Learning Based RF Signal Classification for Wireless Systems
… and coordinate its access among heterogeneous wireless systems, network administrators and/or users must be able to identify observed transmissions rapidly and accurately. Recent research shows that deep neural networks (DNNs) can identify the underlying waveform of an RF signal based on the …
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Reconfigurable and Interference-Tolerant Receivers for Next Generation Wireless Systems
… offers significant hardware efficiency for 5G systems. However, addressing strong interferers in this wide and congested spectrum remains a major design challenge. N-path filters offer a promising solution for efficiently suppressing interference, thanks to their clock-controlled …
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