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 185 for “"Multiple input multiple output (MIMO)"”.
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Design, Fabrication, and Measurement of a Multiple-Input Multiple-Output (MIMO) Antenna for Mobile Communication
… and characterization of a multiband uniplanar MIMO antenna for hand-held mobile communication devices on LTE, WLAN, and WMAN networks. The antenna design methodology combined a variety of broadbanding techniques that resulted in a single-layer hybrid monopole antenna coupled to a meander line …
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Outage probability at finite SNR
… reduce the outage probability of a single user multiple input multiple output (MIMO) channel when a sub-optimal transceiver architecture is used. We show that in slow-fading scenarios, the outage probability can be improved by using unitary rotations combined with coding. We provide analysis and …
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Transmit antenna selection in fading wireless communication systems
To address the drawbacks associated with multiple-input multiple-output (MIMO) systems, we propose the use of the transmit antenna selection technique. In transmit antenna selection, the best performing antenna(s) is selected from all the available transmit antennas for transmission. Transmit …
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Some Information Theoretic Aspects of Reliable Communication With Transmitter Side Information
… of determining the capacity region of the multiple-input-multiple-output (MIMO) Gaussian broadcast channel. Our main result is a new extremal inequality as the underpinning mathematical structure for the MIMO Gaussian broadcast channel problem. In one special case, this inequality yields a …
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A Study of Wireless Modem Performance Using Multiple Element Antennas
… wireless modems are likely to be based on multiple antenna hardware platforms, following 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) …
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Performance Evaluation of Multiuser Detectors with V-BLAST to MIMO Channel
… uplink using AWGN, Rayleigh flat fading single-input single-output (SISO) and multiple-input multiple-output (MIMO) channel models. First, we review the performance of three multiuser receivers; the decorrelator, the MMSE receiver and the multistage parallel interference cancellation receiver in …
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Channel Estimation Overhead Reduction for Downlink FDD Massive MIMO Systems
<p>Massive multiple-input multiple-output (MIMO) is the concept of deploying a very large number of antennas at the base stations (BS) of cellular networks. Frequency-division duplexing (FDD) massive MIMO systems in the downlink (DL) suffer significantly from the channel estimation overhead. In …
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Dynamic modeling and control of a proton exchange membrane fuel cell as a distributed generator
… electric power system. The PEM fuel cell is a Multiple Input Multiple Output (MIMO) system with various dynamic states. In most previous model studies, the stack temperature of a fuel cell was considered to be constant. For long duration short transient and analysis, the stack temperature …
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Fast algorithm for joint unicast and multicast beamforming in large-scale systems
… multicast beamforming problem for massive multiple-input multiple-output (MIMO) system with a large number of unicast users. We propose an alternating direction method of multipliers (ADMM)-based fast algorithm that efficiently obtains the beamforming solutions for unicast and multicast …
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Hardware/Software Co-Design Architecture and Implementations of MIMO Decoders on FPGA
During the last years, multiple-input multiple-output (MIMO) technology has attracted great attentions in the area of wireless communications. The hardware implementation of MIMO decoders becomes a challenging task as the complexity of the MIMO system increases. This thesis presents …
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Data retrieval in MIMO systems and the effects of correlation on the channel capacity
Multiple-input multiple-output (MIMO) antenna design as used in communication is today, easily the most important field in the wireless field; as capacities of data are increased based on the inherent capability of the technology, without an increase in spectrum bandwidth.This thesis analyses the …
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Unitary Space-Time Transmit Diversity for Multiple Antenna Self-Interference Suppression
… can be compared to the effect of fading in a multiple-input multiple-output (MIMO) multi-path scattering environment. Confidence in this comparison leads to the use of unitary space-time MIMO codes to overcome the signal self-interference. The possibility and performance of several of these …
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Transmit Precoder Design for Dual-Function Radar-Communication Systems
… capabilities grow, the ability to conduct multiple RF system functions from a common aperture is being realized. Conducting both radar and communications functions from the same system is potentially useful for vehicular, health monitoring, and surveillance applications. This paper …
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MIMO radar: signal processing, waveform design, and applications to synthetic aperture imaging
This dissertation analyzes the capability of multiple-input, multiple-output (MIMO) radar techniques to improve the image quality and area-coverage rate of synthetic aperture imaging systems. A signal processing architecture for MIMO radar is used to understand the applicability of MIMO for …
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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
… Repeat reQuest (HARQ) combining scheme for a 4x4 Multiple Input Multiple Output (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 …
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Wideband Channel Characterization for MIMO Scenario
… there is growing interest in broadband wireless multiple-input multiple-output (MIMO) channel models. This thesis verifies the suitability of the Saleh Valenzuela with Angle (SVA) model for wideband MIMO communication models. While recent wideband MIMO measurements have been obtained by switching …
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Multiantenna Communications in the Presence of Feedback
… partial CSI feedback link in the point-to-point multiple-input multiple-output (MIMO) system. The analysis provides insights into the optimality of the low-complexity transmit beamforming scheme in the presence of partial CSI feedback. The study of benefits of multiantenna technology is then …
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Energy efficient multiple antenna communication
We consider a multiple-input, multiple-output (MIMO) wideband Rayleigh block fading channel where the channel state is unknown at the transmitter and receiver and there is only an average input power constraint. We compute the capacity and analyze its dependence on coherence length, number of …
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Evaluation of coding scheme for MIMO radar
Multiple Input Multiple Output (MIMO) antenna systems have shown a great potential for wireless communication. These systems support high capacity, increased diversity and interference suppression. Recently it has been proposed MIMO constellations for Radar. MIMO Radar is not only a new research …
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New hybrid automatic repeat request (HARQ) combining with space time block coding (STBC) in invariant and variant fading channel
… (HARQ) combining for space time block coding Multiple Input Multiple Output (MIMO) system consisting of N transmit antennas and M receive antennas (NxM) in a time invariant channel and in a time varying channel is proposed and its performance is analyzed. Based on the measured channel matrix, …
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