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 29 for “"carrier sense"”.
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In defense of wireless carrier sense
Carrier sense, or clear channel assessment (CCA), is widely used in wireless medium access control (MAC) protocols as the means to arbitrate access and regulate concurrency, striking a balance between interference protection and spatial reuse. Criticized widely in the literature, carrier sense has …
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Interference and power control in ad hoc wireless networks
… ad hoc networks, the RTS/CTS dialog or virtual carrier sensing is less effective since a transmission takes place over three ranges: interference range, carrier sense range and transmission range. The values of interference range do not interrupt a transmission if it is close to noise floor, …
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Performance analysis of ALOHA networks utilizing multiple signal power levels
… Keywords: Packet communications; Throughput; Carrier sense multiple access; Communication networks; Theses; Radio broadcasting. (jd/rh)
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Low cost integrated substation protection and control system
… protocol but uses standard IEEE '802.3 Carrier 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 …
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Enabling dense spatial reuse in millimeter-wave networks
… interference, as well as by the inefficiency of carrier sense at detecting interference in directional links. This thesis presents BounceNet, the first many-to many millimeter wave beam alignment protocol that can exploit dense spatial reuse to allow many links to operate in parallel in a …
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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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Service Differentiation Using Managed Sleep in CSMA/CA Networks
… This thesis proposes a new protocol called Carrier Sense Multiple Access 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 …
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Security threats to the MAC-layer in wireless networks
… how network parameters impact the uncooperative carrier-sense-misbehaving attackers. Next, this dissertation shows a novel DoS attack that targets queuing behavior of access points by exploiting some factors of the IEEE 802.11 MAC protocol. Further, I propose a scheme that establishes a wireless …
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Simulation of the MAC Portion of IEEE 802.11 and Bursts of Errors for Wireless Data Networks
… access control mechanism on a principle called Carrier 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 …
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Magneto inductive communication system for underwater wireless sensor networks
… access control (MAC) protocol 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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Performance of voice and data transmission using the IEEE 802.11 MAC Protocol
… 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 includes an optional polling scheme called the Point Coordination Function (PCF) to deliver …
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Medium Access Control in Impulse-Based Ultra Wideband Ad Hoc and Sensor Networks
… This provides a base MAC protocol similar to carrier sense multiple access (CSMA) in narrowband systems. Next, we propose to exploit the unique signaling of I-UWB to improve performance over the base MAC protocol without the associated overhead of similar improvements in narrowband systems. …
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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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The Design, Building, and Testing of a Constant on Discreet Jammer for the IEEE 802.15.4/ZIGBEE Wireless Communication Protocol
… 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 seems to …
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Efficient distributed medium access algorithm
… or "back-off-like" algorithm and uses "carrier sense" information. This is the first instance of MAC that is proven to be performance optimal for general interference topology. Our solution blends the classical Metropolis-Hastings sampling mechanism with insights obtained from analysis …
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RFID as a key enabler of the internet of things : localization and communication
… backscatter RFIDs lack functionalities like carrier sense and rate adaptation, and hence RFID-sensor networks tend to suffer from collisions and inefficient data communication. In this dissertation, instead of considering collision as detrimental and trying to avoid it, we show how to …
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Wireless sensor network for health monitoring
… software platforms. Especially, it focuses on Carrier Sense Multiple 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 …
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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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Digital communication networks incorporating mobile data terminals
… switching technique has been achieved. The carrier 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 …
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Timing channel codes for covert communication and network flow tracing
The 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, …
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