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 16 of 16 for “"Amplify and forward (AF)"”.
-
Channel estimation in a two-way relay network
… with the help of a relay applying the amplify-and-forward (AF) relaying scheme. The training based channel estimation technique is applied to the proposed network where the numbers of the training sequence transmitted by the two transceivers, are different. All three terminals are …
-
Resource allocation for multi-cell OFDMA based cooperative relay network
… used to assist in communication between sender and receiver. In order to maximise their performance, networks which employ RSs require a new resource allocation and optimisation technique, which takes the RSs into account as a new resource. Several proposals have been presented for the purpose …
-
Joint relay beamforming and transceiver processing in multiuser relay network
… this thesis, we focus on joint relay beamforming and transceiver processing in multiuser relay network. First of all, we consider the scenario in which multiple source-to-destination (S-D) pairs intend to communicate with the help of multiple distributed amplify-and-forward (AF) relays. A rank-two …
-
Wireless transmission with energy harvesting and storage
… systems equipped with energy harvesting devices and finite-capacity batteries. The methods are proposed for the unbounded fading environment. Due to the time-dependent and random behavior of the energy arrival and fading, this dissertation focuses on the stochastic optimization problem to …
-
Power efficient designs for 5G wireless networks
In this dissertation, to step forward towards green communication, we study power efficient solutions in three potential 5G wireless networks, namely an asynchronous multicarrier two-way Amplify-and-Forward (AF) relay network, a multi-carrier two-way Filter-and-Forward (FF) network, and a massive …
-
Sum-rate optimal network beamforming and power allocation for single-carrier asynchronous bidirectional relay network
… with the help of multiple single-antenna amplify-and-forward (AF) relays. We assume that the network is asynchronous meaning that different transceiver-relay links cause significantly different propagation delays in the signal they convey. As a result, the end-to-end channel is not …
-
Precoder Design for Cooperative Cognitive Radio Systems
… optimal transmission strategies at the source and relay nodes in cooperative underlay CR systems assumption are studied with an aim of achieving maximum possible throughput for the secondary system for two different scenarios: one with multiple secondary relay nodes with a single antenna at …
-
Physical layer security: secrecy performance analysis and design of cooperative communication systems
… 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 researchers. To minimise the security risks of such attacks, researchers have attempted to secure the upper …
-
Distributed Space-Time Message Relaying for Uncoded/Coded Wireless Cooperative Communications
… 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 attention to these extra observations which were formerly neglected within networks. Cooperative communication …
-
Cooperative diversity aided direct-sequence code-division multiple-access systems
… systems, the distance between the relay and the destination receiver may be significantly shorter than that between the source transmitter and the destination receiver. Therefore, the transmission power of the relay may be significantly reduced in comparison to that of the source …
-
Performance Evaluation and Improvement of Wireless Amplify-and-Forward Cooperative-Based Systems under Nodes Mobility and Imperfect CSI Estimation Impacts
… multiple users (via relays) to assist a source forwarding its data to a final destination. Cooperative communication techniques have shown their capability in improving system reliability and extending coverage area, and hence, it is believable that they will act as a promising technology for …
-
Cooperative Detection and Network Coding in Wireless Networks
… 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, coverage area extension, and network throughput, with …
-
UAV-Enabled Wireless Communications: Deployment, Optimization, and Analysis
… high likelihood of line-of-sight (LoS) links and ease of deployment, they play a crucial role in providing faster and better wireless network access and service where extra network resources are needed short term, like sports events, or to those emerging services that require high-capacity …
-
Resource allocation and secure communication design in simultaneous wireless information and power transfer systems
… the key enabling solutions to supply continuous and stable energy for the energy-constrained wireless devices. Simultaneous wireless information and power transfer (SWIPT) has been developed as a more promising RF energy transfer technique since it enables wireless information and wireless energy …
-
Cooperation in Wireless Networks
… be very effective in increasing network capacity and reliability. However, equipping a wireless node with multiple antennas may not be practical, as the footprint of multiple antennas may not fit on a wireless node (particularly on handheld wireless devices). In order to achieve spatial diversity …
-
Drone Cellular Networks: Fundamentals, Modeling, and Analysis
… for a variety of applications due to their rapid and flexible deployment, cost-effectiveness, and high chance of forming line-of-sight (LoS) links to the ground nodes. As with any new technology, the benefits of incorporating UAVs in existing cellular networks cannot be characterized without …