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 45 for “"CSMA"”.
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Robustness and Optimality in CSMA Wireless Networks
In today's widely diffused CSMA wireless networks, problems of coordination in the access to the channel by multiple transmitters can lead to unfair situations where some of the flows receive much of the network throughput while others suffer from poor performance. As a solution to this problem, …
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Performance Improvements for FDDI and CSMA/CD Protocols
<p>The High-Performance Computing Initiative from the White House Office of Science and Technology Policy has defined 20 major challenges in science and engineering which are dependent on the solutions to a number of high-performance computing problems. One of the major areas of focus of this …
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Improving Performance for CSMA/CA Based Wireless Networks
… Sense Multiple Access with Collision Avoidance (CSMA/CA) based wireless networks are becoming increasingly ubiquitous. With the aim of supporting rich multimedia applications such as high-definition television (HDTV, 20Mbps) and DVD (9.8Mbps), one of the technology trends is towards increasingly …
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Service Differentiation Using Managed Sleep in CSMA/CA Networks
… with Collision Avoidance and Managed Sleep, or CSMA/CA/MS. This protocol uses admission control techniques to bring better than best effort quality of service to wireless networks. A lightweight microeconomic-based pricing model makes use of wireless power management features to determine which …
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Power evaluation and performance enhancement of CSMA/CA based WLANs.
… Sense Multiple Access with Collision Avoidance (CSMA/CA) based Wireless Local Area Networks (WLANs) are becoming pervasive. As the most commonly employed standard in WLANs, IEEE 802.11 not only gives rise to health and safety concern from the general public, but also has the potential for …
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A Performance Analysis of a CSMA Multihop Packet Radio Network
In a packet radio network, multiple terminals broadcast information over a shared communications medium. Messages are transmitted from a source terminal to a destination terminal over multiple relays or hops. The actions of one terminal in the network directly affect the actions of other terminals …
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Performance study on a dual prohibition Multiple Access protocol in mobile Ad Hoc and Wireless Mesh networks
… Finally, we compare the DPMA protocol with the CSMA/CA protocol and find that DPMA with optimal configuration has better performance than CSMA/CA under both low and high network density.
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Wireless sensor network for health monitoring
… Access with Collision Avoidance mechanism (CSMA/CA) algorithms for reliable communication in multiple accessing networks. The performance analysis metrics are established through measured data and mathematical analysis. This dissertation evaluates the network performance of the IEEE 802.15.4 …
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Digital communication networks incorporating mobile data terminals
… sense multiple access with collision avoidance (CSMA/CA) is found to be the most appropriate protocol which has the ability to satisfy equally the operational requirements for local area networks as well as for radio and mobile radio applications. The suggested version of the protocol is designed …
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Simulation of the MAC Portion of IEEE 802.11 and Bursts of Errors for Wireless Data Networks
… Sense Multiple Access with Collision Avoidance (CSMA/CA), which is an adaptation of the Carrier Sense Multiple Access with Collision Detection (CSMA/CD) protocol used by IEEE 802.3 standard. The collision avoidance scheme in CSMA/CA allows data packets to be transferred via the wireless medium …
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The Design, Building, and Testing of a Constant on Discreet Jammer for the IEEE 802.15.4/ZIGBEE Wireless Communication Protocol
… and home automation devices. This protocol uses CSMA-CA (Carrier Sense Multiple Access w/ Collision Avoidance) which allows for multiple ZigBee devices to transmit simultaneousness and allows for wireless coexistence with the existing protocols at the same frequency band. The CSMA-CA MAC layer …
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Low cost integrated substation protection and control system
… Sense Multiple Accesses/Collision Detection (CSMA/CD) protocol (Ethernet). Data Acquisition and control is done directly so that it could be used on a range of different manufacturers' equipment. These capabilities make this development to act as a system integrator for substation protection …
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On a Joint Physical Layer and Medium Access Control Sublayer Design for Efficient Wireless Sensor Networks and Applications
… sense multiple access with collision avoidance (CSMA/CA) based networks. First, transmission power control (TPC) is investigated in multi and single-hop WSNs using typical hardware platform parameters via simulation and numerical analysis. A novel approach to testing TPC at the physical layer is …
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Cooperative Jamming in Wireless Networks - Turning Attacks into Privacy Protection
… received packets. Adding CJWN to the popular CSMA/CA adopted in IEEE 802.11 will add more security even the key for encryption/decryption is already exposed. Because the overhead of CJWN is very big, we do not suggest using it on every transmission. When some secret packets have a high …
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Hidden Terminal Detection in Wide-Area 802.11 Wireless Networks
… issue in wireless networks based on the CSMA medium access control scheme. Hidden terminals pose a complex challenge to network operators trying to identify the underlying cause of performance issues. This thesis describes new methods for the detection and measurement of the hidden …
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Movable frame hybrid MAC : a multi-MAC protocol for wireless software radios in multi-rate multimedia applications
… conventional access techniques which are CDMA, CSMA, TDMA and FDMA are combined in the basic band. Reservation band choose these four techniques flexibly depending the traffic characteristics and quality of services (QoS) requirement. This Movable Frame Hybrid MAC (FMHMAC) is called software …
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Distributed MAC protocol for networks with multipacket reception capability and spatially distributed nodes
… designed for narrow-band systems (e.g., CSMA/CA) is inefficient. It is well known that when networks with spatially distributed nodes operate with such MAC protocols, the channel may be captured by nodes that are near the destination. We show that when the physical layer enables …
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Performance modelling and enhancement of wireless communication protocols
… scheme to cope with hidden stations and CSMA/CA techniques with linear contention window (CW) adjustment for medium access. A 1-dimensional Markov chain model is constructed instead of the bi-dimensional model in order to obtain simple mathematical equations of the average packet …
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Magneto inductive communication system for underwater wireless sensor networks
… based on the carrier sense medium access (CSMA) has also been implemented for the designed sensor node to improve throughput in a dense network"--Abstract, page iv.
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Timing channel codes for covert communication and network flow tracing
… encoder and for a network employing the CSMA/CA. This protocol modifies the inter-packet delays of the network flow using an exponential back-off rule. The second scheme does not relay any message but adds a signature called a watermark to enable flow tracing through the network with …
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