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.
Results
Showing 1 to 20 of 79 for “"phy"”.
-
Wideband Autonomous Cognitive Radios: Spectrum Awareness and PHY/MAC Decision Making
… tracking in an alien RF environment; 3) joint physical layer and medium access control layer (PHY/MAC) decision-making for wideband bandwidth aggregation (simultaneous operation over multiple modes/networks); and 4) autonomous spectrum sensing scheduling solutions in an alien ultra wideband RF …
-
Effects of dietary enzyme supplementation on performance, bone ash, small intestinal morphology, and apparent ileal amino acid digestibility of broilers exposed to a live coccidia oocyst vaccine
… control diets in EXP 1 were supplemented with phytase (PHY), protease (PRO), xylanase (XYL), and the combination of PHY+PRO, PHY+XYL, and PHY+PRO+XYL. Negative control diets in EXP 2 were supplemented with PHY A, PHY B, and PHY C. In EXP 3, PC diets were supplemented with PHY at 1000 FTU/kg, …
-
The Function and Regulation of Photobodies in Phytochrome Signaling
… the red- and far-red light-sensing phytochromes (phys) are arguably the best studied, but the earliest events in the phy signaling pathway remain poorly understood. One of the earliest phy signaling events is the translocation of photoactivated phys from the cytoplasm to the nucleus, …
-
Improving IoT security through the use of deep learning at the physical layer
… IoT networks. Based on the OSI stack, the physical (PHY) layer–of each IoT device and associated network–is the first layer exposed to attacks. Traditionally, IoT security techniques are implemented in higher OSI layers, thus these techniques ignore the PHY layer and any potential security …
-
Analysis and Cross -Layer Design of Medium Access and Scheduling in Wireless Mesh Networks
Due to the characteristics of wireless PHY/MAC, cross-layer design is needed to achieve good performance in multihop wireless mesh networks. We propose a cross-layer scheme to coordinate the operations of different layers in IEEE 802.16 backhaul mesh networks where the nodes are equipped with …
-
Towards next generation WLANs: exploiting coordination and cooperation
… over the past few years. The corresponding MAC/PHY specification, the IEEE 802.11 standard, has also evolved to adapt to such development. However, as the number of WLAN mobile users increases, and as their needs evolve in the face of new applications, there is an ongoing need for the further …
-
Digital communication and control circuits for 60ghz fully integrated CMOS digital radio
… CMOS digital radio chipset comprises of PHY and MAC layers, RF transceiver, High-Speed Digital Interface and an underlying Serial Communication Fabric. To have a complete communication solution compliant with the latest ECMA-369, ISO/DIS 13156 and IEEE 802.15.3c standards, we build a …
-
On Interference Management for Wireless Networks
… of them are limited to signal processing at the physical (PHY) layer or information-theoretic exploitation. Studies of advanced interference techniques from a cross-layer optimization perspective remain limited, especially involving multi-hop wireless networks. This dissertation aims at filling …
-
Coding in 802.11 WLANs
… convolutional codes are used for FEC at the physical (PHY) layer. As is typical in wireless systems, only a limited choice of pre-speci¯ed coding rates is supported. These are implemented in hardware and thus di±cult to change, and the coding rates are selected with point to point operation …
-
Secretion of active recombinant phytase from stably transformed soybean cells
… of this research was to express a fungal phytase gene in transgenic soybean cells to to study the potential for improving phosphorus utilization in soybean meaL A simple and inexpensive particle inflow gene gun was constructed and bombardment was optimized as assayed by β-glucuronidase …
-
Link Adaptation Algorithm and Metric for IEEE Standard 802.16
… 802.16 task group recently standardized the physical (PHY) and medium-access control (MAC) layers for BWA systems. To operate in a wide range of physical channel conditions, the standard defines a robust and flexible PHY. A wide range of modulation and coding schemes are defined. While the …
-
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 …
-
Transmitter Authentication in Dynamic Spectrum Sharing
… a transmitter authentication scheme at the physical (PHY) layer. In PHY-layer authentication, an authentication signal is generated by the transmitter, and embedded into the message signal. This enables a regulatory enforcement entity to extract the authentication signal from the received …
-
Physical layer-aware wireless link layer protocols
… (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 of new link-layer protocols that improve throughput by using information about the channel …
-
LTE radio analytics made easy and accessible
… and spatial granularity. LTEye accesses the LTE PHY layer without requiring private user information or provider support. It provides deep insights into the PHY-layer protocols deployed in these networks. LTEye's analytics enable researchers and policy makers to uncover serious deficiencies in …
-
Underwater acoustic communications and adaptive signal processing
… experiments and computer simulations on both Physical (PHY) and Media access control (MAC) layers. The ocean experimental results show that without channel equalization, the full tail-biting convolution (FTBC) codes with short packet lengths not only can perform similarly to zero-tailing …
-
Improving Performance for CSMA/CA Based Wireless Networks
… recent IEEE 802.11n proposals seek to provide PHY rates of up to 600 Mbps. In addition to increasing bandwidth, there is also strong interest in extending the coverage of CSMA/CA based wireless networks. One solution is to relay traffic via multiple intermediate stations if the sender and the …
-
SoftCast : exposing a waveform interface to the wireless channel for scalable video broadcast
… conventional bit-pipe interface of the wireless physical layer (PHY) forces the separation of source and channel coding, to realize SoftCast, architectural changes to the wireless PHY are necessary. This thesis discusses the design of RawPHY, a reorganization of the PHY which exposes a waveform …
-
Providing availability in the lower layers of a wireless network: philosophies and case studies
… to escape DoS attacks. For each philosophy, this dissertation presents a case study. I present a location verification protocol at the physical (PHY) layer that detects misbehavior in order to provide reliable position-based services. I also present a transport layer protocol that …
-
MAC and Physical Layer Design for Ultra-Wideband Communications
… if the 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 …
Page 1 of 4