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 13 of 13 for “"MIMO Communications"”.
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MIMO communications over multi-mode optical fibers
We consider multi-input multi-output (MIMO) communications over multi-mode fibers (MMFs). Current MMF standards, such as OM3 and OM4, use fibers with core radii of 50\,$\mu$m, allowing hundreds of modes to propagate. Unfortunately, due to physical and computational complexity limitations, we cannot …
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Architectures for Symbol Timing Synchronization in MIMO Communications
… for communication over a frequency non-selective MIMO fading channel is developed. The cases of known data (data-aided estimation) and unknown data (non-data-aided estimation) together with known channel and unknown channel are considered. The analysis shows that the log-likelihood functions and …
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Dynamic Metasurface Grouping for IRS Optimization in Massive MIMO Communications
… consideredthe uncontrollable part of wireless communications, the channel. These smart signal mirrors show promise to significantly improve the effective signal-to-noise-ratio (SNR) of cell-users when the line-of-sight (LOS) channel between the base station (BS) and user is blocked. IRSs use …
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Measurement-based analysis of MIMO communications over the PCS spectrum
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Lattice reduction for MIMO detection: from theoretical analysis to hardware realization
… reduction (LR) preprocessing for wireless MIMO communication systems. The motivation for this work stems from the need to improve the bit-error-rate performance of conventional, low-complexity detectors while simultaneously exhibiting considerably reduced complexity when compared to the …
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Machine Learning-Based Receiver in Multiple Input Multiple Output Communications Systems
… technologies to multiple-input-multiple-output (MIMO) communications systems is a primary driving force for next-generation wireless systems. This dissertation introduces a variety of neural network structures for symbol detection/equalization tasks in MIMO systems configured with two different …
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Machine Learning for Millimeter Wave Wireless Systems: Network Design and Optimization
… the use of multiple-input-multiple-output (MIMO) techniques to increase the wireless capacity. However, the small wavelength of mmWave yields severe path loss and high channel uncertainty. Meanwhile, using a large number of antenna elements requires a high energy consumption and heavy …
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Propagation models for multiple-antenna systems : methodology, measurements and statistics
The trend in wireless communications is towards utilization of multiple antenna systems. While techniques such as beam-forming and spatial diversity have been implemented for some time, the emergence of Multiple-Input Multiple-Output (MIMO) communications has increased commercial interest and …
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Resilient Waveform Design for OFDM-MIMO Communication Systems
… (OFDM) and the Multiple Input Multiple Output (MIMO) systems; the `de-facto' air-interface of most wireless broadband standards including LTE and WiMAX. The major contributions of this dissertation are: 1) developing jamming taxonomy, 2) proposing OFDM and MIMO equalization jamming attacks and …
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Designing a dynamic spectrum sharing algorithm between DCS and LTE in the 1800 MHz band: a case study of a mobile telecommunication operator in Zimbabwe
… such as Multiple Input Multiple Output (MIMO) communications, heterogeneous networks, and cooperative communications, spectrum scarcity continues to pose a challenge for regulatory agencies worldwide. Facing this challenge, Dynamic Spectrum Sharing (DSS) has emerged as a promising remedy. …
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On robust and secure wireless communication system design using software-defined radios
… three parts: airborne multi input multi output (MIMO) communications, physical layer authentication, and software radio design for DARPA Spectrum Challenge. A common theme for the three distinct problems is the system perspective that we have adopted throughout this dissertation. Instead of …