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.
Results
Showing 1 to 20 of 37 for “"Cooperative Communication"”.
-
Wireless Cooperative Communication and Networking
<p>Cooperative communication can achieve diversity gain and increase the channel capacity. This paper proposes a novel cooperative scheme called Cooperative Step-Wise Demodulation, which utilizes low level demodulation to demodulate high level modulated signal cooperatively. This paper focuses …
-
Performance analysis of cooperative communication for wireless networks
… need has motivated the transition of wireless communications from a fixed infrastructure based cellular communications technology to a more pervasive adhoc wireless networking technology. Challenges still remain in wireless adhoc networks in terms of meeting higher capacity demands, improved …
-
Distributed Turbo Product Coding Techniques Over Cooperative Communication Systems
In this dissertation, we propose a coded cooperative communications framework based on Distributed Turbo Product Code (DTPC). The system uses linear block Extended Bose-Chaudhuri-Hochquenghem (EBCH) codes as component codes. The source broadcasts the EBCH coded frames to the destination and nearby …
-
Cooperative communication and distributed detection in wireless sensor networks
Recent progress in microelectronic and wireless communications have enabled the development of low cost, low power, multifunctional sensors, which has allowed the birth of new type of networks named wireless sensor networks (WSNs). The main features of such networks are: the nodes can be positioned …
-
A cooperative communication protocol for wireless ad-hoc networks
… presents the design and implementation of a communication protocol that utilizes local cooperation among nodes to efficiently transfer data. Multi-hop routing in ad-hoc wireless networks realizes some scalability benefits over direct transmission by utilizing cooperation in the network layer, …
-
Physical layer security: secrecy performance analysis and design of cooperative communication systems
… have gained increasing interest in the field of communication security. Due to the nature of wireless networks potential security risks, vulnerabilities and threats are still a possibility, such as eavesdropping and denial of service attacks, which have been an interesting subject for many …
-
Cooperative communications in wireless networks : novel approaches in the mac layer
… this thesis, different novel approaches for the cooperative communication problem in the medium access control (MAC) layer are proposed. The novelty of this thesis is two-fold. We first investigate the problem of cooperative communication in a special type of wireless networks, namely ultra …
-
Power Control and Resource Allocation for QoS-Constrained Wireless Networks
Developments such as machine-to-machine communications and multimedia services are placing growing demands on high-speed reliable transmissions and limited wireless spectrum resources. Although multiple-input multiple-output (MIMO) systems have shown the ability to provide reliable transmissions in …
-
Cooperative relaying using USRP and GNU radio
Wireless communication systems have shown a tremendous development in recent years. New technologies are born day to day. With today's technology, users can communicate with each other from any corner of the world. But wireless technologies are often prone to various effects like multipath fading, …
-
Analysis and Optimization of Cooperative Wireless Networks
<p>Recently, cooperative communication between users in wireless networks has attracted a considerable amount of attention. A significant amount of research has been conducted to optimize the performance of different cooperative communication schemes, subject to some resource constraints such as …
-
Communication Strategies for Single-User and Multiuser Slow Fading Channels
Technological progress in the field of wireless communications over the past few years has only been matched by the increasing demand for sophisticated services at lower costs. A significant breakthrough was achieved in the design of efficient wireless communication systems with the advent of the …
-
Distributed Space-Time Message Relaying for Uncoded/Coded Wireless Cooperative Communications
During wireless communications, nodes can overhear other transmissions through the wireless medium, suggested by the broadcast nature of plane wave propagation, and may help to provide extra observations of the source signals to the destination. Modern research in wireless communications pays more …
-
Communication in the hymenoptera : chemistry, ecology and evolution
Insects exhibit complex systems of communication with chemical signalling being the most important mode. Although there are many studies on chemical communication in insects, the evolution of chemical signals is not well understood. Due to the conflict of interests between individuals, different …
-
Performance Evaluation and Improvement of Wireless Amplify-and-Forward Cooperative-Based Systems under Nodes Mobility and Imperfect CSI Estimation Impacts
Cooperative communication techniques have been introduced in wireless networks to achieve spacial diversity-gain via the readiness of multiple users (via relays) to assist a source forwarding its data to a final destination. Cooperative communication techniques have shown their capability in …
-
Cluster-based wireless mobile ad-hoc network security
A wireless ad-hoc network is a cooperative communication network deployed with a specific purpose. It is characterized by dynamically changing topology with no fixed infrastructure which exhibits a perfectly vulnerable state for a number of different kinds of attacks. This thesis proposes a novel …
-
Intelligent antenna sharing in cooperative diversity wireless networks
Cooperative diversity has been recently proposed as a way to form virtual antenna arrays that provide dramatic gains in slow fading wireless environments. However, most of the proposed solutions require simultaneous relay transmissions at the same frequency bands, using distributed space-time …
-
Interactive media and social exchange of market information
A persistent belief in marketing communication is that consumer word-of-mouth (WOM) plays a crucial role in the diffusion of information in a society. The Internet, the largest network ever created by humans, demonstrates the validity of this wisdom by enabling individual consumers from all over …
-
Design, Implementation and Characterization of a Cooperative Communications System
Cooperative communications is a class of techniques which seek to improve reliability and throughput in wireless systems by pooling the resources of distributed nodes. While cooperation can occur at different network layers and time scales, physical layer cooperation at symbol time scales offers …
-
Prioritization, security and relay selection in network coded multiple access relay networks
<p>Wireless communication is undoubtedly one of the most significant advancements by the mankind for improving quality of life. Information is transmitted from one point to another via electromagnetic waves. After Shannon's landmark paper ``A Mathematical Theory of Communication'' in 1948, …
-
Learning communication policies for decentralized task allocation under communication constraints
Multi-UAS teams often operate in ad-hoc communication networks where blind application of consensus algorithms perform poorly because of message intensive nature of such algorithms. Important messages can get lost due to interference or collisions with other messages, and the broadcasting of less …
Page 1 of 2