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 15 of 15 for “"802.11p"”.
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Enhanced snr-based admission control algorithm for vehicular ad-hoc network
… effects on data delivery is illustrated and how 802.11p has outperformed 802.11 in terms of data delivery is also demonstrated. Lastly, starvation problem is investigated where results showed increased data loss when vehicle nodes unable to deliver data correctly. Finally, a QoS-aware Signal to …
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Power control for fair dynamic channel reservation
… this thesis we compare the performance of IEEE 802.11p and a recent time-division based medium access control protocol, Dynamic Channel Reservation (DCR) in realistic high-density traffic scenarios. We focus on the communication requirements that allow vehicles to receive safety messages well …
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Monolithic RF frontends for ubiquitous wireless connectivity
… systems. Case in point, the recently ratified 802.11p standard targets wireless access in vehicular environments. The first part of this thesis presents an RF frontend for 802.11p applications. Gallium Nitride is used as an enabling technology platform for monolithic integration of high-power …
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Intelligent transportation systems leveraging next-generation mobile devices, sensors, and networks
… phones, and design and build a prototype of an 802.11p radio that is suited for the power and size constraints mobile devices, allowing them to communicate directly with each other without routing through a router or cellular network. Our evaluation shows reductions in power consumption of …
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FPGA IMPLEMENTATION OF A REALTIME CYCLOSTATIONARY FEATURE DETECTOR FOR OFDM SIGNALS
… will be identified for the detection of the 802.11p OFDM modulation used for DSRC communications. A test statistic will be given that is invariant to the signal noise covariance to allow simple and robust operation. Finally, the detection algorithm will be implemented in FPGA digital logic in …
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Μοντελοποίηση και ανάπτυξη ετερογενών κινητών δικτύων οχήματος-προς-όχημα (Vehicle-to-Vehicle) και οχήματος- προς-υποδομή (Vehicle-to-Infrastructure) με έμφαση σε δύσκολα περιβάλλοντα μετάδοσης
… ασύρματου κινούμενου ετερογενούς (HetNet) IEEE 802.11p - LTE δικτύου οχημάτων με χρήση των τεχνικών SISO (single-input & single-output)και MIMO (multiple-input & multiple-output) εντός προαστιακού περιβάλλοντος. Ο αλγόριθμος περιλαμβάνει τη δυναμική ομαδοποίηση των οχημάτων σε clusters καθώς και …
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Performance improvement in mobile ad-hoc networks.
… the vehicular ad-hoc networks standard (the IEEE 802.11p). To summarize, the main contribution of this research is that two schemes will improve the network throughput significantly without modification of the standard. Therefore, there is no implementation issue to deploy the proposed schemes in …
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The influence of transmission range on the performance of Vehicular AD-HOC Network (VANET)
… which portrays the mobility impact on the IEEE 802.11p MAC protocol performance, especially for the V2V communications between high mobility nodes. Moreover, the system performance also subjected to various factors including the transmission range, traffic load and number of flows that change …
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Wireless Vehicular Communication Based Solution for Road Traffic Efficiency
… and supported by emerging standards such as IEEE 802.11p. In turn the popularity of these applications is one of the key factors, which will drive the uptake of these vehicular communications technologies and ultimately determine their market success. Applications for vehicular communications can …
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Distributed mobile platforms and applications for intelligent transportation systems
… deployed it on 10 vehicles using 4G (LTE), 802.11p DSRC and 802.11n adhoc WiFi, and measured cellular access reductions up to 84%, response time improvements up to 80%, and effectiveness of the system in enforcing congestion control policies. We also simulated large-scale scenarios using …
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Design of a medium access control protocol that exploits the structures of vehicular networks
… of magnitude lower than those obtained by IEEE 802.11p at various vehicle densities and in different vehicular traffic environments. Moreover, DCPR increases goodput by a factor as high as nine in a wireless environment with fading compared to a basic dynamic TDMA protocol. With regard to …
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MIMO channel modelling and simulation for cellular and mobile-to-mobile
… intelligent transportation systems (e.g., IEEE 802.11p standard). Different from conventional fixed-to-mobile (F2M) cellular systems, in M2M systems both the transmitter (Tx) and receiver (Rx) are in motion and often equipped with low elevation antennas. Multiple-input-multiple-output (MIMO) …
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Coexistence of Vehicular Communication Technologies and Wi-Fi in the 5 and 6 GHz bands
… vehicular settings. Since DSRC uses the IEEE 802.11p standard for its physical (PHY) and medium access control (MAC) layers, the manner in which DSRC and Wi-Fi devices try to gain access to the channel is fundamentally similar. Consequently, we show that spectrum sharing between these two …
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Open Platforms for Connected Vehicles
L'abstract è presente nell'allegato / the abstract is in the attachment
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Measurement Based Channel Characterization and Modeling for Vehicle-to-Vehicle Communications
… pathloss and fading model named VirtualSource11p for V2V communication in urban street intersections. The reference model is validated with the help of independent channel measurement data. It is found that the model is flexible and fits well to most of the measurements with a few exceptions, …