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.
Results
Showing 1 to 20 of 20 for “"energy detection"”.
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Energy-detection based spectrum sensing for cognitive radio on a real-time SDR platform
… techniques are reviewed, which include energy detection, entropy detection, matched-filter detection, and cyclostationary detection. In this dissertation, the energy sensing technique is examined. A real-time energy detector is developed on the Software-Defined Radio (SDR) testbed that …
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An adaptive threshold energy detection technique with noise variance estimation for cognitive radio sensor networks
… We make amendments to the conventional energy detector particularly on the threshold selection technique. We propose an adaptive threshold energy detection model with noise variance estimation for implementation in CRSN systems. Experimental work on our adaptive threshold technique based …
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Auditory-nerve and energy-detection models of temporal summation in hearing: a theoretical and experimental investigation
… activity of the auditory nerve and one on energy-detection theory, are presented and developed in detail: both are shown capable of predicting the result of the bursts and gaps experiment. Seven experiments are reported. Experiment 1 found the reaction time to the start of a faint tone …
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Analysis of digital communication signals and extraction of parameters
… Electronics Support Measure (ESM) Communications detection systems is compared from the standpoint of the unintended receiver (interceptor). Typical digital communication signals considered include Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), Frequency Shift Keying …
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Multi-Slot Cooperative Spectrum Sensing for Cognitive Radio Networks
… cognitive radio model is presented based on energy detection sensing and multi-slot spectrum allocation. The model is evaluated based on two decision strategies, ‘Square Law Combining' Soft fusion, and ‘Majority Rule' Hard fusion sensing. The choice of applying energy detection for local …
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Dynamic Spectrum Access Network Simulation and Classification of Secondary User Properties
… methods. Therefore, this thesis focuses on energy detection for channel sensing. Constraining computing requirements by operating with limited spectrum sensing equipment allows for efficient use of limited broadband by user devices. The research on using the Naïve Bayesian classifier coupled …
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MULTI USER COOPERATION SPECTRUM SENSING IN WIRELESS COGNITIVE RADIO NETWORKS
… include the problems of noise uncertainty and detection in low signal to noise ratio (SNR) environments in individual spectrum sensing. In addition to issues of energy consumption, sensing delay and reporting error in cooperative spectrum sensing. In this thesis, we investigate how to improve …
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Imperfect Monitoring in Multi-agent Opportunistic ChannelAccess
… potentially be achieved using advanced signal detection techniques but not by simple energy detection. However, energy detection is currently the primary detection technique proposed for use in cognitive radio networks. This creates a need to design a channel selection strategy under the …
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Unsupervised segmentation of heart sounds
… of two approaches to segmentation: peak energy detection and sliding window autocorrelation. Emphasis is placed on synchronous detection of the heartbeats, so that subsequent subsystems can superimpose the heartbeats.An experimental database of heart sounds was compiled to assess the …
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On the Scalability of Ad Hoc Dynamic Spectrum Access Networks
… also develop and integrate a detailed model for energy detection in Poisson networks with sensing. We observe that the network capacity scales sub-linearly with the number of DSA users and the end-to-end throughput diminishes, when the number of data channels is fixed. Nevertheless, we show that …
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Ultra-Wideband Transceiver Design And Optimization
… (0.88pJ/pulse at 1Mpulse/s) with a dynamic (energy) efficiency of 16pJ/pulse. The transmit out pulse is FCC part 15 compliant over process voltage and temperature (PVT) variations. The transmitter is semi-compliant with IEEE 802.15.6 and IEEE 802.15.4 standards and will become completely …
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A variable threshold for an energy detector using GNU radio
… radio meant to determine radio parameters. Energy Detection (ED) is a spectrum sensing technology that has a low computational and operational complexity, a relatively fast spectrum sensing technique to other spectrum sensing technologies, and requires no knowledge of the primary user’s …
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On the Use of Deep Learning Models for Interference Detection and Mitigation
… composed of two major modules: interference detection and interference mitigation. Detection is performed using advanced deep learning architectures such as using a hybrid Convolutional Neural Network(CNN) models knows as InceptionTimePlus and MiniRocketPlus, with results compared to …
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Wireless Sensor Networking in Challenging Environments
… Channel Hopping (ARCH) protocol and the Adaptive Energy Detection Protocol (AEDP). ARCH enhances network reliability through opportunistically changing radio's frequency to avoid interference and environmental noise and AEDP reduces false wakeups in noisy wireless environments by dynamically …
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Performance Evaluation of Cognitive Radio Spectrum Sensing Techniques through a Rayleigh Fading Channel
… and widely used methods for spectrum sensing are energy detection, matched filter detection, cyclostationary feature detection and cooperative based spectrum sensing. This dissertation investigates the performance of these spectrum-sensing techniques through a Rayleigh fading channel. In a …
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Statistical Analysis of Wireless Systems Using Markov Models
… in the environment. Most of the time traditional energy detection techniques fail to detect these signals because of their low SNRs. In the second part of this thesis, we address this problem by using higher order statistics of incoming signals and classifying them by using the pattern recognition …
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Mixed-Signal Architectures for Spectrum Sensing
… potential power savings by performing signal detection in the analog domain, significantly reducing the analog-to-digital converter (ADC) sampling rate. The integrating mixer is a novel mixed-signal architecture for spectrum sensing that is based on the short-time Fourier transform (STFT). The …
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Nuisance to nemesis: nuclear fallout and intelligence as secrets, problems, and limitations on the arms race, 1940-1964
… in the early Cold War. Operated as the Atomic Energy Detection System by a covert Air Force unit known as AFOAT-1, the AEDS detected emissions and analyzed fallout from Soviet nuclear tests, as well as provided quantitative intelligence on the size of the Russian nuclear stockpile. Virtually …
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Detekce obsazenosti rádiového kanálu v obvodu FPGA
Náplní práce je zmapování obvyklých i méně obvyklých metod detekce signálu v rádiovém kanále, počítačová simulace vybraných metod a implementace vybrané metody do obvodu FPGA
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On Distributed and Acoustic Sensing for Situational Awareness
… spectrum sensing, we study the optimality of energy detection that has been widely used in the literature. This thesis studies the potential optimality (or sub-optimality) of the energy detector in spectrum sensing. With a single sensing node, we show that the energy detector is provably …