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 “"physical layer"”.
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Physical layer security for IoT applications
… the IoT to life. In this regards, employing physical layer security (PLS) methods could be greatly beneficial for IoT networks. While current security solutions rely on computational complexity, PLS is based on information theoretic proofs. By removing the need for computational power, PLS is …
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Physical Layer Security in Millimeter-Wave Communication
… to the data encryption with cryptographic keys, physical layer security (PLS) is another effective technique to achieve secret communication. The inherent randomness of wireless channels are exploited to ensure the confidential information carried by the signals can only be obtained by the target …
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Physical layer-aware wireless link layer protocols
… about the wireless channel at the link layer. This dissertation makes two contributions: (i) a redesign of the interface between the physical and link layers in wireless networks to expose more information about the wireless channel to the link layer, and (ii) the design and evaluation …
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A Physical Layer Implementation of Reconfigurable Radio
… radios are configurable devices in which the physical layer can be reprogrammed to support various standards. Field programmable architectures provide a suitable platform to achieve such run-time reconfigurations of the physical layer of the radio. This thesis explores the use of FPGAs in the …
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On The Design Of Physical Layer Rateless Codes
… optimization technique to optimally design such physical layer Raptor codes. Our optimized Raptor codes are shown to perform within 0.2 dB to the Shannon limit for most of the realized code-rates. We also provide the asymptotic curves, decoding thresholds, and simulation results showing that our …
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Physical Layer Fault Tolerance for Foundation Fieldbus Network
The open all-digital communications protocol FOUNDATION Fieldbus offers a wide range of benefits to process control systems through data reliability, diagnostics, interoperability, and distribution of controls to an unprecedented level. However, lack of media redundancy on its H1 networks can …
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Physical layer encryption using fixed and reconfigurable antennas
… mathematical cryptography. Recent research into physical layer encryption shows that jointly designing for reliability and secrecy at the physical layer may be a better solution. Physical layer encryption involves techniques that ensure a signal is information-theoretically secure, meaning that …
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Wireless Network Physical Layer Security with Smart Antenna
… the smart antenna technology to develop physical layer solutions to anti-eavesdropping and location security problems. We first investigate the problem of enhancing wireless communication privacy. A novel scheme named "artificial fading" is proposed, which leverages the beam switching …
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Wireless Physical Layer Security: Towards Practical Assumptions and Requirements
The current research on physical layer security is far from implementations in practical networks, arguably due to impractical assumptions in the literature and the limited applicability of physical layer security. Aiming to reduce the gap between theory and practice, this thesis focuses on …
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Wireless Physical Layer Security: Towards Practical Assumptions and Requirements
The current research on physical layer security is far from implementations in practical networks, arguably due to impractical assumptions in the literature and the limited applicability of physical layer security. Aiming to reduce the gap between theory and practice, this thesis focuses on …
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Physical Layer Aware Algorithms and Protocols for Wireless Networks
… that theoretical arguments require a cross layer re-design of TCP taking wireless interference into account, our work suggests the use of in-network congestion control to automatically adapt flow rates inside the network.
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A comparative analysis of physical-layer rateless coding architectures
An analysis of rateless codes implemented at the physical layer is developed. Our model takes into account two aspects of practical communication system design that are abstracted away in many existing works on the subject. In particular, our model assumes that : (1) practical error detection …
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Controlling physical layer parameters for mobile ad-hoc networks
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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Physical Layer Design for a Spread Spectrum Wireless LAN
… communication services. This thesis presents a physical layer design for a direct sequence spread spectrum ISM band radio LAN system. This radio system employs spread spectrum communication technology and a differential binary phase shift keying/quadrature phase shift keying (BPSK/QPSK) …
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MAC and Physical Layer Design for Ultra-Wideband Communications
… existing MACs adequately support the UWB PHY (Physical) layer for the applications envisioned for UWB. Thus, in this work we propose a new MAC scheme for an Impulse Radio based UWB PHY, which is based on a CDMA approach using a code-broker in a piconet architecture. The performance of the …
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Resource allocation and physical layer security in wireless communication systems
… in which spatial multiplexing is employed in the physical layer. The thesis consists of two main parts; in the first, the interest is focused on optimizing system's performance in terms of users' transmission rate. Under this context, a low-complexity but highly performing user selection algorithm …
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Software-Defined Radio Implementation of Two Physical Layer Security Techniques
This thesis discusses the design of two Physical Layer Security (PLS) techniques on Software Defined Radios (SDRs). PLS is a classification of security methods that take advantage of physical properties in the waveform or channel to secure communication. These schemes can be used to directly …
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Hybrid FPGA and GPP Implementation of IEEE 802.15.4 Physical Layer
… two different cases of hybrid IEEE 802.15.4 PHY (Physical Layer) implementation are explored. The first case is an FPGA implementation of IEEE 802.15.4 PHY on the Xilinx Spartan-3A DSP FPGA of USRP N210. All of the signal processing tasks are performed on the FPGA, while less complex MAC (Media …
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