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 “"Channel correlation"”.
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Effect of Exponential Correlation Model on Spectral and Energy Efficiency for Massive MIMO Systems
… there is little attention so far on the spatial correlation between the channels. Most of the published work are assuming that the antennas are uncorrelated which is not the case in real-world situations. In this dissertation, the effect of channel correlation model on the Massive MIMO …
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Iterative detection for overloaded OFDMA with spatial diversity
… mitigate the effects of the wireless multipath channel but are limited in system capacity to available bandwidth. This shortcoming can be worked around through the process of "overloading," where users are additionally multiplexed in the spatial domain to each frequency resource. To efficiently …
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Combined Space-Time Diversity and Interference Cancellation for MIMO Wireless Systems
… of multiple-input and multiple-output (MIMO) channels to enhance the capacity of wireless systems. In this study, we develop and evaluate a channel model, evaluate the corresponding channel capacity, and design and analyze a simple orthogonal transmit waveform for MIMO channels in mobile radio …
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Low-Latency Massive MIMO Design over Practical Channels
… of massive MIMO, I measure the wireless channel in-the-wild with RiceArgos platform. Surprisingly, I find that geolocational far-away user channels can still be of high correlation even for the base-station with 64 antennas. More specifically, the mutual channel correlation between …
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A channel subspace post-filtering approach to adaptive equalization
… type of wireless communications in which the channel is highly dynamic and the amount of ISI due to multipath is relatively large. In the underwater acoustic channel, associated with each of the deterministic propagation paths are macro-multipath fluctuations which depend on large scale …
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EM-Based iterative channel estimation and sequence detection for space-time coded modulation
… transmitted over a wireless communication channel requires knowledge of the channel estimate. In this work, the application of expectationmaximization (EM) algorithm to estimation of unknown channel and detection of space-time coded modulation (STCM) signals is investigated. An STCM …
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Novel Estimation and Detection Techniques for 5G Networks
… division multiplexing (OFDM) to estimate the channel blindly. The system is based on modulating particular pairs of subcarriers using amplitude shift keying (ASK) and phase-shift keying (PSK) adjacent in the frequency domain, which enables the realization of a decision-directed (DD) one-shot …
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Channel Estimation in TDD and FDD-Based Massive MIMO Systems
… to this thesis. In the first part, we study the channel estimation problem in frequency-selective multi-user (MU) multi-cell massive multiple-input multiple-output (MIMO) systems, where, a time-domain semi-blind channel estimation technique is proposed. Compared to frequency-domain, the …
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Characterization of Dynamic Structures Using Parametric and Non-parametric System Identification Methods
… the acceleration were less accurate. The inter-channel correlation and sensor spatial resolution had significant effects on the mode decomposition accuracy. *ICA showed the lowest performance in this mode decomposition study. It was observed that the excitation type and system characteristics …
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Speech Enhancement Methods Based on CASA Incorporating Spectral Correlation
… key cue for labeling the binary mask. The cross-correlation between the noisy speech and estimated noise power spectra in each channel is employed to build the objective function. The T-F units of speech and noise are labeled with a decision factor derived from the powers of noisy speech, …
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Distortion-Tolerant Communications with Correlated Information
… by exploiting the spatial and/or temporal correlation in a broad range of wireless communication systems under various system configurations. Signals observed in wireless communication systems are often correlated in the spatial and/or temporal domains, and the correlation can be used to …
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Design of single-carrier frequency domain equalization (SC-FDE) with transmit diversity for wireless and optical communications
… packets over the wireless communication channel. Broadband data transmission over wireless channels commonly faces the challenges of multipath fading channels, which are both time and frequency selective. There is then a need to design transmission techniques that can combat the adverse …
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Low-Complexity Algorithms for Channel Estimation in Optimised Pilot-Assisted Wireless OFDM Systems
… band splitting into relatively flat fading subchannels, and allows for low-complexity transceiver implementation based on the fast Fourier transform algorithms. Combining OFDM modulation with multilevel frequency-domain symbol mapping (e.g., QAM) and spatial multiplexing (SM) over the …