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 26 for “"CSMA/CA"”.
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Improving Performance for CSMA/CA Based Wireless Networks
Carrier 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 …
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Service Differentiation Using Managed Sleep in CSMA/CA Networks
Performance of multimedia and real-time applications such as streaming video and voice over IP is easily degraded by a high network traffic load. Current Internet infrastructure provides no special assistance for these sensitive applications. One solution to this problem is to introduce Quality of …
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Power evaluation and performance enhancement of CSMA/CA based WLANs.
Carrier 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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Performance study on a dual prohibition Multiple Access protocol in mobile Ad Hoc and Wireless Mesh networks
… networks are less reliable than wired networks because channels are “exposed” to the surrounding environment that is susceptible to interference and noise. To minimize losses of data due to collisions, wireless networks need a mechanism to regulate the access on the transmission medium. Medium …
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Wireless sensor network for health monitoring
… Sensor Network (WSN) is becoming a significant enabling technology for a wide variety of applications. Recent advances in WSN have facilitated the realization of pervasive health monitoring for both homecare and hospital environments. Current technological advances in sensors, …
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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
… of some protocols. These wireless protocols can be used in the growing field of IoT where wireless sensors are used to share information throughout a network. IoT is being implemented in homes, agriculture, manufactory, and in the medical field. Disrupting a wireless device from proper …
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Simulation of the MAC Portion of IEEE 802.11 and Bursts of Errors for Wireless Data Networks
… (MAC) portion of the IEEE 802.11 wireless local area network (LAN) protocol.An important ingredient in rapid expansion of wireless networks is the seamless transition between wired and wireless systems. The IEEE standards group in charge of developing the widely used IEEE 802.3 LAN standard …
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On a Joint Physical Layer and Medium Access Control Sublayer Design for Efficient Wireless Sensor Networks and Applications
… memory, power source, and often with the capability for short range wireless communication. These networks are used in various applications, and have created interest in WSN research and commercial uses, including industrial, scientific, household, military, medical and environmental …
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Digital communication networks incorporating mobile data terminals
The use of digital communication systems is increasing very rapidly. This is due to lower system implementation cost compared to analogue transmission and at the same time, the ease with which several types of data sources (data, digitised speech and video, etc.) can be mixed. The emergence of …
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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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Distributed MAC protocol for networks with multipacket reception capability and spatially distributed nodes
The physical layer of future wireless networks will be based on novel radio technologies such as Ultra-Wideband (UWB) and Multiple-Input Multiple-Output (MIMO). One of the important capabilities of such technologies is the ability to capture a few packets simultaneously. This capability has the …
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Performance modelling and enhancement of wireless communication protocols
In recent years, Wireless Local Area Networks(WLANs) play a key role in the data communications and networking areas, having witnessed significant research and development. WLANs are extremely popular being almost everywhere including business,office and home deployments.In order to deal with the …
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Timing channel codes for covert communication and network flow tracing
… goal of this thesis is to achieve covert communication, i.e. to covertly relay information using resources that are traditionally unintended for data transmission. In a covert channel, only the sender and receiver are aware of the communication and capable of reading the transmitted message, and …
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Performance of voice and data transmission using the IEEE 802.11 MAC Protocol
… a lossy, wireless medium. To efficiently allocate resources for bursty sources, the 802.11 Medium Access Control (MAC) sublayer uses a type of Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) protocol called the Distributed Coordination Function (DCF). The MAC protocol also …
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Effective Scheduling Algorithms for Cross-Interference Mitigation in Heterogeneous Wireless Networks
… and more convenient. However, the well-known Carrier-sense multiple access with collision avoidance (CSMA/CA) mechanism is powerless when dealing with Cross-Technology Interference (CTI) between Wi-Fi and Low-Rate Wireless Personal Area Network (LR-WPAN), because of asymmetric transmission …
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OWSS And MIMO-STC-OFDM: Signaling Systems for the Next Generation of High Speed Wireless LANs
… the demand for high data rate wireless communications has increased fourfold as consumers demand better multimedia communications over the wireless medium. The next generation of high speed WLANs is expected to meet this increased demand for capacity coupled with high performance and spectral …
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Modelling, analysis and design of MAC and routing protocols for wireless body area sensor networks.
… (WBASNs) for remote patient monitoring applications by considering saturated and un-saturated traffic scenarios. The design of these protocols has considered the stringent Quality of Service (QoS) requirements of patient monitoring systems. Moreover, the thesis also provides intelligent …
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Quality of Experience Enhancement Architecture For Video Delivery On WiFi
… the same time, there is a proliferation of WiFi capable devices such as mobile phones and portable computers with the capability of consuming video content using WiFi as the access technology. Due to the proliferation of such devices, there is a probability of reduced video Quality of Experience …
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Analytical and simulation performance modelling of indoor infrared wireless data communications protocols
The Infrared (IR) optical medium provides an alternative to radio frequencies (RF) for low cost, low power and short-range indoor wireless data communications. Low-cost optoelectronic components with an unregulated IR spectrum provide the potential for very high-speed wireless communication with …
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Link layer protocol performance of indoor infrared wireless communications
… implementation issues and protocol modifications that improve the operation of short range infrared connections. The performance of optical wireless links is measuredby the utilization, which can be drawn at the data link layer. A new mathematical model is developed that reaches a simple …
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