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 8 of 8 for “"SNR estimation"”.
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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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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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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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Blind recognition of analog modulation schemes for software defined radio
… symbol timing, and signal to noise ratio (SNR), and automatically identify modulation schemes. In this dissertation research, several fundamental SDR tasks for analog modulations are investigated, since analog radios are often used by civil government agencies and some unconventional …
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Dynamic Cone-beam Reconstruction for Perfusion Computed Tomography
… volume of interest. This is denoted as optimal-SNR estimation. Optimal-SNR reconstruction can be carried out independently of the number of scans performed during acquisition as long as the sampling condition is fulfilled. Based on this principle, the temporal interpolation is extended to a …
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Cooperative relaying in cellular networks for improving receiver diversity and cell radius
… Bit error rate (BER) and signal to noise ratio (SNR). The BER vs. SNR plots are computed for various linear receiver diversity combining techniques and are used to evaluate performance of the system. These results are also compared to the conventional cellular network performance with a single …
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Classification and Parameter Estimation of Asynchronously Received PSK/QAM Modulated Signals in Flat-Fading Channels
… is proposed which uses a method-of-moments based estimation approach. For the second research thrust of this thesis, the developed method-of-moments based estimation approach is extended to estimate the signal-to-noise ratio of PSK/QAM modulated signals in flat-fading channels, in which no a …
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Energy-efficient detection system in time-varying signal and noise power
In many detection applications with battery-powered or energy-harvesting sensors, energy constraints preclude the use of the optimal detector all the time. Optimal energy-performance trade-off is therefore needed in such situations. In many signal processing applications, the signal and noise power …