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 647 for “"SNR"”.
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Outage probability at finite SNR
In this thesis, we present a technique to 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 …
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Motor learning on a heaving plate via improved-SNR algorithms
Creatures in nature have subtle and complicated interactions with their surrounding fluids, achieving levels of performance as yet unmatched by engineered solutions. Model-free reinforcement learning (MFRL) holds the promise of allowing man-made controllers to take advantage of the subtlety of …
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Enhanced snr-based admission control algorithm for vehicular ad-hoc network
… Finally, a QoS-aware Signal to Noise Ratio (SNR) admission control mechanism (QASAC) is proposed to handle the performance anomaly problem while maintaining the QoS levels for high and low traffics. This can result in wasting throughput and cause data loss. The investigation results show that …
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Gamma-ray studies of the young shell-type SNR RX J1713.7-3946
One of the most significant current discussions in Astrophysics relates to the origin of high-energy cosmic rays. According to our current knowledge, the abundance distribution of the elements in cosmic rays at their point of origin indicates, within plausible error limits, that they were initially …
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Measuring Noise in the VHF Band and Its Effect on Low SNR Signal Detection
With the increasing demand for access to the crowded radio frequency spectrum, cognitive radios have been suggested as one solution. Cognitive radios would be frequency agile and able to sense their radio environment and opportunistically use empty spectrum. Spectrum sensing, monitoring a given …
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Phase multipath estimation for global positioning system (GPS) using signal-to-noise-ratio (SNR) data
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1997.
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Design of a 3-D rapidly scanning laser Doppler velocimeter with low SNR signal processing
… estimation for some frequency ratios at SNR levels above 30 dB, which are typical quality signals required for frequency counters. The FFT with zero-padding and log parabolic fit provides frequency estimates with RMS error below 1 % for signals with SNR above -5 dB. To obtain frequency …
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Use of principal component analysis with linear predictive features in developing a blind SNR estimation system
… develop a non-intrusive method for determining SNR, or a method that does not require the presence of the original clean signal.</p> <p>In this thesis, several extracted features were investigated to determine whether a neural network trained with data from corrupt speech signals could …
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Surface Based Decoding of Fusiform Face Area Reveals Relationship Between SNR and Accuracy in Support Vector Regression
… prediction accuracy and spatial signal-to-noise (SNR). We found that this relationship varied between resting state and task, as well as the functionality of features included in SVR modeling.
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Use of linear predictive features and pattern recognition techniques to develop a vector quantization based blind SNR estimation system
… the transmission medium. Signal-to-noise ratio (SNR) is a common concept found in all forms of electrical communications. The easiest way to measure the signal-to-noise ratio is through intrusive means in which a corrupt signal is compared to its original signal. This technique is inefficient and …
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An investigation on the use of SNR distributions for the optimisation of coarse-fine spectrum sensing for cognitive radio
… sensing architectures under a distribution of SNRs for Dynamic Spectrum Access (DSA). Three different detector architectures are investigated: the Coarse-Sorting Fine Detector (CSFD), the Coarse-Deciding Fine Detector (CDFD) and the Hybrid Coarse-Fine Detector (HCFD). To date, the majority of …
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Learning compact hashing codes for large-scale similarity search
… regularized Adaboost and signal-to-noise ratio (SNR) maximization. The regularized Adaboost builds on the classical boosting framework for hashing, while SNR maximization is a novel hashing framework with theoretical guarantee and great flexibility in designing hashing algorithms for various …
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Noncoherent Communication Over Fading Channels
Finally, we consider signaling designs for a high SNR, high mobility communication scenario. For a Gauss-Markov Rayleigh fading channel, we derive upper and lower bounds for the mutual information generated by the Gaussian input distribution. The upper bound shows that the mutual information …
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Performance bounds on matched-field methods for source localization and estimation of ocean environmental parameters
… the estimation at low signal-to-noise ratio (SNR), leading to a threshold performance behavior. Second, most matched-field algorithms show a strong sensitivity to environmental/system mismatch, introducing some biased estimates at high SNR. In this thesis, a quantitative approach for ambiguity …
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Performance bounds on matched-field methods for source localization and estimation of ocean environmental parameters
… the estimation at low signal-to-noise ratio (SNR), leading to a threshold performance behavior. Second, most matched-field algorithms show a strong sensitivity to environmental/system mismatch, introducing some biased estimates at high SNR. In this thesis, a quantitative approach for ambiguity …
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An image quality analysis of ANVIS-6 night vision goggles
… (SQRI), Resolution, and Signal-to-Noise Ratio (SNR). The performance tasks were detection and recognition of targets under various levels of moon illumination. The metric that best related to target detection was SNR. The SNR results are consistent with visual psychophysics and SNR effects. The …
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Measurement of Antenna Performance in Analog LMR Systems Using PL Tone Analysis
… (PL) tone. The PL tone signal-to-noise ratio (SNR) is calculated by measuring the power of the tone relative to the sub-audio noise power. The PL tone SNR for both antenna systems is compared as it provides a ``bottom line'' evaluation of the antenna performance. The audio SNR can also be …
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Improving the Capabilities of Swath Bathymetry Sidescan Using Transmit Beamforming and Pulse Coding
… systems is limited by signal-to-noise ratio (SNR) and they are also susceptible to multipath interference. This thesis explores two methods for increasing SNR and mitigating multipath interference for SBS systems. The first, binary coded pulse transmission and pulse compression is shown to …
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On the Impact of Channel and Channel Quality Estimation on Adaptive Modulation
… by using more energy efficient schemes in low SNR conditions are reserving the use of QAM for high SNR conditions. The second drawback leads to a requirement of high quality channel estimation. Many researchers have studied pilot symbol assisted modulation for compensating the effects of fading …
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