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 108 for “"Wireless channel"”.
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Wireless Channel Equalization in Digital Communication Systems
… by the problems caused in the multipath fading wireless channels. Our quest is to remove one of the obstacles in the way of achieving ultimately fast and reliable wireless digital communication, namely Inter-Symbol Interference (ISI), the intensity of which makes the channel noise …
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Developing and Utilizing Multivariate Stochastic Wireless Channel Models
Developing accurate channel models is paramount in designing efficient mobile communication systems. The focus of this dissertation is to understand the small-scale fading characteristics, develop mathematical tools that accurately capture these characteristics and utilize them in three different …
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SoftCast : exposing a waveform interface to the wireless channel for scalable video broadcast
… and mobile video challenge the conventional wireless design. In broadcast and mobile scenarios the bit-rate supported by the channel differs across receivers and varies quickly over time. The conventional design however forces the source to pick a single bit-rate and degrades sharply when the …
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Adaptively Predictive Clustering of Mimo Beamforming Considering Co-Channel Interference in Time Varying Wireless Channel
… significant effort to enhance the capacity of wireless communication channels. For example, results have been reported for MIMO (Multiple Input Multiple Output), spatial and temporal multiplexing, channel diversity, and power and direction controlled beamforming.</p><p>In this research, we …
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An Examination into the Statistics of the Singular Vectors for the Multi-User MIMO Wireless Channel
… methods in multiple-input-multipleoutput (MIMO) wireless channels make use of the singular value decomposition (SVD) of the channel matrix. For the multi-user case, the SVD of the channel matrix for each user may result in right and left singular vectors that are similar between users. This …
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Design and Implementation of a Swept Time Delay Short Pulse (SSTDSP) Wireless Channel Sounder for LMDS
… a Sampling Swept Time Delay Short Pulse (SSTDSP) wireless channel sounder, capable of real time in field performance characterization of high speed fixed wireless links. The SSTDSP sounder has been designed to provide vital performance metrics for fixed point high data rate applications in the 28 …
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Machine learning applications in plant identification, wireless channel estimation, and gain estimation for multi-user software-defined radio
… of: plant identification from images of leaves, channel state information (CSI) estimation for wireless multiple-input-multiple-output (MIMO) systems, and gain estimation for a multi-user software-defined radio (SDR) application. </p><p>In the first task, two methods for plant species …
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Implementation of Geometrically Based Single-Bounce Models for Simulation of Angle-of-Arrival of Multipath Delay Components in the Wireless Channel Simulation Tools, SMRCIM and SIRCIM
As the demand for wireless communication systems has exploded over the past few years, many researchers have taken on the challenge to model wireless channels more accurately. These models are very useful for enhancing the design of all aspects of wireless communications. Smart antennas and systems …
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Optimized Image Compressed Sensing And Transmission Through Wireless Channels
… through an additive white gaussian noise wireless channel. The poor rate-distortion performance that accompanies compressed sensing after applying quantization has led to several works in quantized compressed sensing. However, most of these works have less consideration of the effect of …
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Feedback schemes in angular domain processing for MIMO antenna systems
… multiplexing of multiple data streams onto the channel and an increase in the channel’s capacity or improved reliability against multipath fading. An MIMO antenna system with Nt transmit antennas and Nr receive antennas, under suitable fading conditions will yield a min(Nt,Nr) degree of freedom …
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Quality of Experience Enhancement Architecture For Video Delivery On WiFi
… reduced video Quality of Experience (QoE) due to wireless channel impairments. Wireless channel impairments are a challenging problem for WiFi which uses the license-free ISM band. Even though most devices using the WiFi frequencies will adhere to the Carrier Sense Multiple Access with Collision …
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Physical layer-aware wireless link layer protocols
With wireless devices becoming ubiquitous, the problem of designing high performance and reliable wireless networks is of great importance today. Wireless links are characterized by a rapidly varying channel, requiring transmitters to dynamically adapt their transmit bit rate. The broadcast nature …
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On the spatial predictability of wireless channels and robust networked cooperation in mobile sensor networks
The wireless sensor network revolution has created the possibility of exploring and controlling the environment in ways not possible before. The vision of a multi-agent network cooperatively learning and adapting in harsh unknown environments to achieve a common goal is closer than ever. In such …
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Efficient channel allocation and medium access organization algorithms for vehicular networking
… Ad-hoc Networks (VANETs), organizing the wireless channel access to efficiently use the bandwidth is one of the main challenges in VANET. In this dissertation, we focus on channel allocation and media access organization for Vehicle-to-Roadside Units (V2R) and Vehicle-to-Vehicle (V2V) …
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Channel Estimation Strategies for Coded MIMO Systems
… and reliability are necessary for future wireless communications systems. In a multipath-rich wireless channel, deploying multiple antennas at both the transmitter and receiver achieves high data rate, without increasing the total transmission power or bandwidth. When perfect knowledge of …
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Design of Media Access Control Schemes for Performance Enhancement of Future Generation Wireless Systems
Wireless Local Area Networks (WLANs) now provide connectivity to many businesses, homes and educational institutions. The wireless channel itself is plagued with numerous problems, such as it does not natively allow sharing of the wireless resource. WLAN devices utilize a complex medium access …
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Adversarial RFML: Evading Deep Learning Enabled Signal Classification
… part of research in all fields, including wireless communications. Researchers have shown the ability to leverage deep neural networks (DNNs) that operate on raw in-phase and quadrature samples, termed Radio Frequency Machine Learning (RFML), to synthesize new waveforms, control radio …
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Real-time sub-carrier Adaptive Modulation and Coding in wideband Orthogonal Frequency Division Multiplexing wireless systems
The increasing demand for high speed wireless connectivity at low cost proposes new challenges for communication systems designers to implement solutions that increase the data rate by utilizing the limited radio resources more efficiently at a low additional complexity. Sub-carrier Adaptive …
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Orthogonal Generalized Frequency Division Multiplexing (OGFDM)
… division multiplexing (OGFDM) for increasing the wireless channel capacity without the need for extra bandwidth (BW) size or power consumption. The new wireless waveform (OGFDM) tends to obtain a better BW efficiency which in turn can increase highly the wireless channel capacity in comparison …
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