of Dissertation Presented to the Graduate School of the University of Florida in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy WIRELESS COOPERATIVE NETWORKS WITH DIFFERENTIAL MODULATION: PERFORMANCE ANALYSIS AND RESOURCE OPTIMIZATION By Woong Cho December 2007 Chair: Liuqing Yang Major: Electrical and Computer Engineering In wireless cooperative networks, virtua...

Network Mobility (NEMO) has been proposed to efficiently manage the mobility of the group of hosts that are moving together as a mobile network. NEMO Basic Support Protocol (BSP) suffers from the problem of inefficient route. A number of route optimization schemes have been proposed in the literature to solve the problem. The schemes are mainly based on four approaches – Delegationbased, Hierar...

Bluetooth allows multi-hop ad-hoc networks that contain multiple interconnected piconets in a common area to form a scatternet. Routing is one of the technical issues in a scatternet because nodes can arrive and leave at arbitrary times; hence node mobility has a serious impact on network performance. Bluetooth network is built in an ad-hoc fashion, therefore, a fully connected network does not...

Mobile Ad-hoc Network (MANET) is a group of moving nodes which can communicate with each other without the help of any central stationary node. All the nodes in the MANET act as router for forwarding data packets. The nodes in the network also move randomly and there exists no fixed infrastructure. So, path breaks are the frequent problem in MANET. The routing protocol faces a lot of problem du...

In today’s world,we are fazed by different types of emergencies in the indoor environment .One such emergency is fire outbreak. Thus, reliable and quick detection of fire is essential. Most prevalently used technology for this purpose is wireless sensor networks(WSN). A system is proposed that enables practical development of centralized cluster-based protocols supported by optimization methods...

Mobile IPv6 (mipv6) is an internet protocol that allows mobile nodes to have continuous network connectivity to the internet without changing their ip addresses while moving to other networks. The packets sent from Correspondent Node (CN) to a Mobile Node (MN) go first through the mobile node’s Home Agent (HA). Then the HA tunnels them to the MN’s foreign network. This process of delivering the...

Wireless sensor networks are concerned with resource and performance constraints. In the light of these constraints, sensor network protocols must operate efficiently and effectively at all times. This applies in particular to the medium access control (MAC) protocol, which dictates to a large extent the energy consumption of a sensor node by controlling the use of the radio transceiver. Moreov...

The multicast routing protocol in Wireless Sensor Networks (WSN) must be energy aware since the nodes are energy constrained due to limited battery life. This gives rise to the need for efficient multicast routing protocol that is able to determine multicast routes which satisfies the quality of service guarantees and at the same time conserves energy. The transmission of real time multimedia s...

Two phase commit PC is used for coordinating the commitment of transactions in distributed systems The preferred PC optimization is the presumed abort variant which reduces the number of messages when transac tions are aborted and eliminates the coordinator s need to retain information about aborted transactions The presumed commit PC variant provides a larger message reduction but its coordina...

The paper proposes local and global optimization schemes for efficient TCP buffer allocation in an HTTP server. The proposed local optimization scheme dynamically adjusts the TCP send-buffer size to the connection and server characteristics. The global optimization scheme divides a certain amount of buffer space among all active TCP connections. These schemes are of increasing importance due to...