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 123 for “"channel state"”.
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Channel state testing in information decoding.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1965. Ph.D.
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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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Channel state quantization in MIMO broadcast systems : architectures and codes
… system design with an emphasis on the role that channel feedback plays in a network setting. We develop new design principles for channel feedback design in such systems and show that the system designer is afforded extra degrees of freedom in the choice of the channel quantizer due to the …
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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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Satellite Channel State Prediction based on Fade Slope and Artificial Intelligence (AI) Algorithms
… bands. For these techniques to work, adequate channel prediction is essential. This involves generating a better predictive approach of rain attenuation, to have a reliable knowledge of the transmission channel, and hence, adaptively optimise the signal to protect against link outages, to …
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Towards location-awareness in next generation wireless networks : a new approach based on channel state information
… by establishing a new approach relying on channel state information (CSI) measurements. In particular, we design an efficient joint message-passing (MP) localization algorithm, which consists of two layers: the transformation layer and the estimation layer. The transformation layer extracts …
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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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Channel-predictive link layer ARQ protocols in wireless networks
Communication performance over a wireless channel should be considered according to two main parameters: energy and throughput. The reliable data transfer is a key to these goals. The reliable node-to-node data transfer is performed by link layer protocols. One prominent approach is Automatic …
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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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Energy-efficient relay cooperation for lifetime maximization
… exploring the correlation of time-varying relay channels, we develop a prediction-based relay cooperation method for optimal power allocation strategy to improve the relay network lifetime over existing methods that do not predict the future channel state, or assume the current channel state …
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Potential games and competitive scheduling in wireless networks
… to a common base station under time-varying channel conditions. A distinguishing feature of our model is the assumption that the channel quality of each user is affected by global and time-varying conditions at the base station, resulting in each user observing a common channel state. Each …
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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 variable-rate modulation and coding scheme for low earth orbit satellites
… satellites have to operate in widely varying channel conditions. These conditions are often significantly better than the 'worst case' situations that are experienced and thus a single rate transmission scheme is clearly suboptimal. The objective of the thesis is to suggest and test a method …
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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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Time varying channel models for 5G mobile communication systems
… mobile users over time varying communication channels remains a shared obstacle. In this thesis, we contribute to these global efforts by providing further fundamental understanding of time varying channels in 5G mobile communication systems and overcome the obstacle. First, we reopen the door …
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