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 32 for “"spatial multiplexing"”.
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Intracellular sensor spatial multiplexing via RNA scaffolds
To circumvent the limitations of spectrally multiplexing sensors, fluorescent sensors are clustered by type and spatially separated in the cytoplasm to avoid cross-talk. Each sensor is fused to an orthogonal viral capsid protein that binds to a long, repetitive strand of its corresponding RNA …
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High Space -Bandwidth Wavefront Sensing by Sampling and Spatial Multiplexing
… out the samples to the output plane (space multiplexing), on a common optical path. The common path fan-out configuration makes the system compact and vibration-insensitive.
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Performance evaluation of cross-layer energy-efficient transmit antenna selection for spatial multiplexing systems
… studies energy-efficient antenna selection for spatial multiplexing multiple-antenna systems from a cross-layer perspective, contrary to the norm, where physical-layer energy efficiency metrics are optimized. The enhanced system performance achieved by cross-layer designs in wireless networks …
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Simultaneous, Large Multi-Gene Delivery for Implementation of Fluorescent Reporter Spatial Multiplexing to Image Signaling Pathways
… cells using fluorescent proteins. Spectral multiplexing has been attempted by engineering reporters to each have a unique spectrum that does not overlap with other reporters to allow for simultaneous recording of multiple signals in a single physiological cascade. However, the problem with …
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Resource allocation and physical layer security in wireless communication systems
… multi-antenna downlink wireless systems in which spatial multiplexing is employed in the physical layer. The thesis consists of two main parts; in the first, the interest is focused on optimizing system's performance in terms of users' transmission rate. Under this context, a low-complexity but …
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Perspectives of Jamming, Mitigation and Pattern Adaptation of OFDM Pilot Signals for the Evolution of Wireless Networks
… multi-tone pilot jammers in SISO- and full rank spatial multiplexing MIMO-OFDM systems. Our results show that the channel estimation performance can be restored even in the presence of a strong pilot jammer. We also show that full rank spatial multiplexing in the presence of a synchronized pilot …
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Feedback schemes in angular domain processing for MIMO antenna systems
… antenna (MIMO) systems provide an additional spatial dimension that yields a degree of freedom gain. The degree of freedom gain in MIMO systems allows for spatial multiplexing of multiple data streams onto the channel and an increase in the channel’s capacity or improved reliability against …
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Multi-layered Space Frequency Time Codes
… These are single user systems that combine spatial multiplexing and transmit diversity. Each layer consists of a space time code. The detection algorithms are based on multi-user detection theory. We consider joint, interference nulling and cancellation, and spatial sequence estimation …
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Transmit Precoder Design for Dual-Function Radar-Communication Systems
… baseband waveforms. A transmit precoder provides spatial multiplexing and power allocation among the radar and communication modes. Multiple optimization approaches for precoder design are developed based upon combinations of radar detection and communication receiver performance metrics. The …
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Impact of MIMO Transmission on CAF-Based Geolocation
… four transmit antennas using either a form of spatial multiplexing or space-time block coding are the focus of this work because they are mostly commonly found in currently deployed communication systems. The effects of these transmit schemes are studied with respect to TDOA/FDOA error and the …
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Sapphire Fiber Based Sensing Technologies for High Temperature Applications
… multiplexed sensing solutions, named frequency-multiplexing and spatial-multiplexing, are proposed and studied to achieve multiplexed sensing based on sapphire fibers.
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Advanced wireless communications using large numbers of transmit antennas and receive nodes
… sends multiple symbols simultaneously using spatial multiplexing.</p>
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Multiplexing, scheduling, and multicasting strategies for antenna arrays in wireless networks
… of data streams into groups; and the subsequent spatial multiplexing and encoding of these groups using array processing. We demonstrate how good system designs can help these two tasks reinforce one another, or alternatively enable tradeoffs in complexity between the two. Moreover, scheduling …
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Spectral efficiency optimization with channel state information of a massive MIMO System
… while using fixed large number of arrays for spatial multiplexing gains. A hybrid precoding architecture for mm Wave systems has been proposed for a system that has imperfect channel state information. Many wireless communication operations can be formulated as nonconvex non-smooth …
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An updatable three-dimensional display via direct optical fringe writing of computer - generated holographic stereograms in photorefractive polymer
… from SLM to photorefractive polymer, and spatial multiplexing for large-image generation - reintroduces accommodation cues to the resulting holographic images and represents a reduction of system footprint, complexity, and cost relative to the current interference-based systems. The …
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On Throughput Maximization in a Multi-hop MIMO Ad Hoc Network
… increase spectral efficiency by leveraging its spatial multiplexing (SM) and interference cancellation (IC) capabilities. Instead of carrying complex manipulations on matrices, degree-of-freedom(DoF) based MIMO models, which require only simple computations, are widely used in networking …
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DESIGN AND ANALYSIS OF COGNITIVE MASSIVE MIMO NETWORKS WITH UNDERLAY SPECTRUM SHARING
… proposed cognitive systems is to leverage the spatial multiplexing strategies to serve a large number of spatially distributed user nodes by using very large numbers of antennas at the base-stations. Moreover, the fundamental performance metrics, the secondary transmit power constraints, which …
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Multi-layer Optimization Aspects of Deep Learning and MIMO-based Communication Systems
… novel physical layer scheme for single user MIMO spatial multiplexing systems based on unsupervised deep learning using an autoencoder. Both transmitter and receiver are designed as feedforward neural networks (FNN) and constellation diagrams are optimized to minimize the symbol error rate (SER) …
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Capacity-approaching data transmission in MIMO broadcast channels
… scheduling, including diversity, beamforming and spatial multiplexing. At a system performance level, our work shows that downlink throughput can be optimized by joint precoding across multiple transmit antennas and exploiting small-scale fading of distributed multiple input and multiple output …
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Analytical Framework for the Performance Analysis of Multiple Antenna Systems
… (diversity, beamforming, null steering, and spatial multiplexing) to enhance the received signal quality and the capacity of wireless communications systems. However, in order to properly exploit the characteristics of different array processing techniques, understanding trade-offs among …
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