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 101 for “"Channel state information"”.
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Relay-aided communications with partial channel state information
… depends on the availability of propagational channel state information. In practice, such information is only accurate to a certain degree which is governed by overhead constraints, feedback delay, and channel fluctuations due to mobility. Understanding the impacts of such partial channel …
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Utilization of Channel State Information in Transmission Control for Wireless Communication Networks
This dissertation deals with the utilization of channel knowledge in improving the performance of wireless communication systems. The first part is about energy harvesting networks. The transmission policies in energy harvesting wireless systems need to adapt to the harvested energy availability …
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Spectral efficiency optimization with channel state information of a massive MIMO System
… been proposed for a system that has imperfect channel state information. Many wireless communication operations can be formulated as nonconvex non-smooth optimization problems. Often there is lack of effective algorithms for these problems especially in the event that the optimization variables …
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Towards location-awareness in next generation wireless networks : a new approach based on channel state information
… a novel approach to localization based on soft information (SI), exploiting all positional information inherent in measurement and contextual data, has been proposed. This thesis further develops SI-based localization by establishing a new approach relying on channel state information (CSI) …
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Iterative Leakage-Based Precoding for Multiuser-MIMO Systems
… of practical impairments including imperfect channel state information, transmit antenna correlation, and time-varying channels. Solutions are derived which improve performance of the algorithm with imperfect channel state information at the transmitter by leveraging knowledge of the …
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Efficient approaches to robust and cooperative wireless network design
… power allocation algorithms when the global channel state information is subject to uncertainty. In addition, we propose practical algorithms that do not require frequent tracking of the global channel state information. This work reveals that ignoring global channel state information …
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Resource allocation for multi-cell OFDMA based cooperative relay network
… interference (ICI) free and full availability of channel state information (CSI) were considered. However, the need for more robust, fair and practical resource allocation algorithms motivated us to study the resource allocation algorithm for OFDMA based cooperative relay networks with more …
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Relay assisted device-to-device communication with channel uncertainty
… user equipment and due to the fading that the channel between these user equipment experiences. In order to fully realise the gains that direct (device-to-device) communication promises, idle user equipment can be exploited to serve as relays to enforce device-to-device communication. The …
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Structure-based learning via graph neural networks for multi-group multicast beamforming
… solution, they are designed under perfect channel state information (CSI) and need to be performed each time channel state information is updated. Due to the complexity involved in solving the problem, they lead to high computational run-time for largescale antenna-array systems. To …
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Resource management in wireless heterogeneous networks: an optimization perspective
… management strategies is the need for the channel state information at the transmitter side. In this thesis we consider transceiver design in wireless HetNet when the channel state information is incomplete/inexact. We propose a general stochastic successive upper-bound minimization …
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A Study of Wireless Modem Performance Using Multiple Element Antennas
… the demand for high data rate. In correlated channels Channel State Information (CSI) at the transmitter provides a significant capacity increase over conventional Multiple Input Multiple Output (MIMO) systems. In such a case, the Singular Value Decomposition (SVD) of the channel matrix gives …
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Physical Layer Security in Millimeter-Wave Communication
… The inherent randomness of wireless channels are exploited to ensure the confidential information carried by the signals can only be obtained by the target users, but not by the unauthorized users. The implementation of the PLS mmWave communication systems should consider the …
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Exploring the Sensing Capability of Wireless Signals
… layer features including signal attributes and channel state information (CSI) can be used for the purpose of physical world sensing. This dissertation focuses on exploring the sensing capability of wireless signals. The research approach is to first take measurements from physical layer of …
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Space-time block coding with imperfect channel estimates
… receiver. The performance of STBC with perfect channel state information (CSI) being available at the receiver has been shown to provide approximately 10 dB of improvement over uncoded transmission in Rayleigh fading when using Quadrature Phase Shift Keying (QPSK) at a bit error rate of 10 -3. …
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New hybrid automatic repeat request (HARQ) scheme for 4x4 MIMO system, based on the extended alamouti quasi-orthogonal space-time bloc coding (Q-STBC), in invariant and variant fading channel
… (MIMO) system in invariant and variant fading channel conditions is proposed and analized. Based on the Extended Alamouti Quasi-orthogonal Space-Time Block Coding (Q-STBC), the use of the so-called Alternative Matrices for transmission, depending on the Channel State Information (CSI) received …
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Spectrum Management in Dynamic Spectrum Access: A Deep Reinforcement Learning Approach
… allocations, independently without accurate channel state information. In this thesis, a novel spectrum management approach is proposed, in which Q-learning, a type of reinforcement learning, is utilized to enable DSA users to carry out effective spectrum managements individually and …
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Multiantenna Communications in the Presence of Feedback
… of communication schemes for wireless systems. Channel state information (CSI) at the transmitter end is often an essential requirement when one wishes to fully utilize the potential gain promised by multiantenna technology. This requirement has sparked enormous interest in the design of …
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Adaptive, Turbo-coded OFDM
… There is a growing need to quickly transmit information wirelessly and accurately. Engineers have already combine techniques such as orthogonal frequency division multiplexing (OFDM) suitable for high data rate transmission with forward error correction (FEC) methods over wireless channels. …
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Distance-1 constrained channel assignment in single radio wireless mesh networks
This thesis addresses channel assignment and random medium access design for single-radio multi-channel mesh networks. Two prior approaches include: (i) designing MAC protocols that dynamically select channels based on local information and (ii) partitioning the mesh into subnetworks with different …
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Transmit Signal Design for MIMO Radar and Massive MIMO Channel Estimation
… The second part of this work focuses on channel estimation for massive MIMO systems. As the size of arrays increase, conventional channel estimation techniques no longer remain practical. In current systems, training sequences probe wireless channels in orthogonal directions to obtain …
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