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 25 for “"Cooperative communications"”.
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Dynamic Cooperative Communications in Wireless Ad-Hoc Networks
This dissertation focuses on an efficient cooperative communication method for wireless ad hoc networks. Typically, performance enhancement via cooperative communications can be achieved at the cost of other system resources such as additional bandwidth, transmit power, or more complex …
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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 …
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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 …
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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 …
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COOPERATIVE COMMUNICATIONS FOR LTE-ADVANCED SYSTEMS: DOWNLINK RELAY AND PERFORMANCE OPTIMIZATION
The Third Generation Partnership Project's Long Term Evolution-Advanced (LTE-A) is considering an option for relay networks to provide cost-effective throughput enhancement and coverage extension. While analog repeaters have been used to enhance coverage in commercial cellular networks, the use of …
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Cooperative Detection and Network Coding in Wireless Networks
In cooperative communication systems, multiple terminals in wireless networks share their antennas and resources for information exchange and processing. Recently, cooperative communications have been shown to achieve significant performance improvements in terms of transmission reliability, …
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A Trust-Based Relay Selection Approach to the Multi-Hop Network Formation Problem in Cognitive Radio Networks
One of the major challenges for today’s wireless communications is to meet the growing demand for supporting an increasing diversity of wireless applications with limited spectrum resource. In cooperative communications and networking, users share resources and collaborate in a distributed …
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Node Selection, Synchronization and Power Allocation in Cooperative Wireless Networks
… by the scarcity of two fundamental resources for communications: bandwidth and power. In turn, cooperative communications has emerged as a new communication paradigm in which network nodes share their antennas and transmission resources for distributed data exchange and processing. Recent studies …
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Performance Analysis of Decode-and-Forward Protocols in Unidirectional and Bidirectional Cooperative Diversity Networks
Cooperative communications have the ability to induce spatial diversity, increase channel capacity, and attain broader cell coverage with single-antenna terminals. This thesis focuses on the performance study of both unidirectional and bidirectional cooperative diversity networks employing the …
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Cooperative DVB-H: Raptor-Network Coding Protocols for Reliable and Energy Efficient Multimedia Communications
… problem. In this thesis, we focus on a cooperative extension to the Digital Video Broadcasting – Handheld (DVB-H) standard, forming a cooperative broadcast network whereby terminal-to-terminal cooperation creates a distributed form of multi-input-multi-output (MIMO) that supplements …
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Cooperative relaying using USRP and GNU radio
… performance of a wireless system much better. Cooperative Communications is one of the fastest growing research technologies that can enable efficient spectrum usage and create a reliable network. In traditional networks, the physical layer is only responsible for communication in between two …
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Performance analysis of cooperative relay networks in presence of interference
In the past decade, cooperative communication has emerged as an attractive technique for overcoming the shortcomings of point-to-point wireless communications systems. Cooperative relaying improves the performance of wireless networks by forming an array of multiple independent virtual sources …
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Relay Diversity Techniques for OFDM and MC-CDMA
The future of mobile and personal communications requires a system<br/>that can support a large number of users and has the ability to provide<br/>high-speed services. Meeting this demand is challenging since wireless<br/>communications are subject to these four major constraints: …
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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 …
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Dynamic Coordination Architecture and Mobility Management for Next Generation Cooperative Cellular Networks
… and mobility management of multi-cell cooperative communications and present novel algorithms to improve the performance of multi-cell cooperative cellular networks. We propose DCEC: Direct CSI-feedback to Elected Coordination-station, a CoMP coordination architecture for cooperative …
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Practical packet combining for use with cooperative and non-cooperative ARQ schemes in wireless sensor networks
… combining approaches are used. These include cooperative communications and hybrid-ARQ schemes which have been shown to be of major benefit for wireless communications. Using the packet combining scheme developed in this thesis more than an 85% reduction in energy costs are possible over …
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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 …
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Cooperative Strategies for Near-Optimal Computation in Wireless Networks
… both network coding and averaging con- sensus, cooperative communications plays a key role. For network cod- ing, I consider two topologies: a single-layer network in which users may signal cooperatively, and a two-transmitter, two-receiver network aided by a dedicated relay. In the former …
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Resource allocation for multi-cell OFDMA based cooperative relay network
Cooperative communications is emerging as an important area within the field of wireless communication systems. The fundamental idea is that intermediary nodes, called relay stations (RSs), who are neither the data source nor destination, are used to assist in communication between sender and …
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Differential modulation and non-coherent detection in wireless relay networks
The technique of cooperative communications is finding its way in the next generations of many wireless communication applications. Due to the distributed nature of cooperative networks, acquiring fading channels information for coherent detection is more challenging than in the traditional …
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