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 29 for “"DSSS"”.
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DSSS detection and direction finding methods for a DSP-based small aperture DF system
… of direct-sequence spread-spectrum signals (DSSS), appropriate for a particular DSP-based direction finding platform. Relevant details on DSSS and radio direction finding are presented. These are used as the theorectical basis for the developemtn of a software-bases simulator fo the direction …
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Knowledge-based decision support system for scheduling in a flexible flow system
Decision Support Systems (DSSs) are necessary resources for most complex decision making situations. The environment under which the DSSs function are, for the most part, evolving and, hence the DSSs should have the capability to adapt themselves as per the changes in the characteristics of the …
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Time-Varying Autoregressive Model Based Signal Processing with Applications to Interference Rejection in Spread Spectrum Communications
… rejection in direct-sequence spread spectrum (DSSS) communications. For fast varying non-stationary signal processing, such as the task to reject an FM interference that could chirp over the entire DSSS bandwidth in a symbol interval, an explicit description of the variation is necessary to …
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An eigenstructure technique for direct sequence spread spectrum synchronization
… techniques for direct sequence spread spectrum (DSSS) synchronization, although rapid, are not robust to multiple access interference. This is because they require the spreading codes of the multiple access network to have very good cross correlation properties. In this thesis, a novel technique …
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An object-oriented approach to structuring multicriteria decision support in natural resource management problems
… Decision Making) and the development of DSSs (Decision Support Systems) tend to be complex and inefficient, leading to low productivity in decision analysis and DSSs. Towards this end, this study has developed an approach based on object orientation for MCDM and DSS modelling, with the …
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A Holistic Usability Framework For Distributed Simulation Systems
… framework for distributed simulation systems (DSSs). The framework is developed considering relevant research in human-computer interaction, computer science, technical writing, engineering, management, and psychology. The methodology used consists of three steps: (1) framework development, (2) …
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Agent-based open connectivity for decision support systems
… the development of Decision Support Systems (DSSs) is the un-standardised DSS environment. Computers that support modern business processes are no longer stand-alone systems, but have become tightly connected both with each other and their users. Therefore, having a standardised environment …
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Implementation of a Software Defined Spread Spectrum Communication System
… We present a mathematical analysis of (DSSS) modulation and demodulation schemes along with the transmitter and receiver design. We use this design to develop an analogous design in GNU Radio using the signal processing blocks that are present in GNU Radio and ones we develop. We perform …
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EnogisAI: An Artificial Intelligence Framework for Predictive Agronomics
… to the development of Decision Support Systems (DSSs) for farmers and agronomists. EnogisAI outputs are integrated within the Enogis agronomic management web platform, used to manage one-fourth of the total Italian viticulture, along with other crops. Relevant external environmental and weather …
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Techniques and adaptation algorithms for direct-sequence spread-spectrum CDMA single-user detection
… spread-spectrum code division multiple access (DSSS-CDMA) system is limited by multiple access interference (MAJ) and the near-far problem. There are two approaches to mitigating these problems: multiuser detection and single-user detection techniques. Multiuser detection techniques cancel the …
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Effective applications of microcomputer-based management information and decision support systems for small and medium sized enterprises
… making. Unfortunately, the development of DSSs for SMEs is even more backward. Yet, there is an emerging need for SMEs today because business operations have become more sophisticated under intensified competition. With this scenario in mind, the author undertook intensive questionnaire and …
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Investigation into variable shift keying using direct sequence spread spectrum techniques
… (Variable Phase Shift Keying) and the use of DSSS (Direct Sequence Spread Spectrum) techniques to achieve carrier synchronization and hence coherent demodulation in the receiver. VPSK is a new and relatively unknown modulation scheme in which data bits are encoded using patented algorithms …
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Improving IoT security through the use of deep learning at the physical layer
… to redesign a Direct Sequence Spread Spectrum (DSSS) communications system such that it inherently, deliberately, and adaptively prevents an adversary from detecting and reconstructing captured messages. Waveform based PHY layer security is improved through a Radio Frequency-Distinct Native …
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Compressive Measurement of Spread Spectrum Signals
… (FHSS) and Direct Sequence Spread Spectrum (DSSS) systems are proposed.
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Adaptive reception for underwater communications
… the received Direct Sequence Spread Spectrum (DSSS) acoustic signal. This information is used by an innovative receiver introduced for usage in the underwater environment. The research also involves the development of a robust acquisition system for the acoustic communication signal. The major …
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Development of an integrated forest management decision support system: integrating the LANDIS model and ArcGIS
… (DSS) application, but most of the current DSSs for forest management are not fully successful because: 1) the user interface is not friendly, or 2) GIS functions are not fully integrated into the system. These limitations unnecessarily reduce the use of DSS planning tools by forest …
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Nearly orthogonal, doppler tolerant waveforms and signal processing for multi-mode radar applications
… we applied direct sequence spread spectrum (DSSS) coding techniques to linear frequency modulated (LFM) signals. The resulting transmitted waveforms are rendered orthogonal using a unique spread spectrum code. At the receiver, the echo signal can be decoded using its spreading code. In this …
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Introducing the use of integrated Decision Support System in Natural Resources Planning
… the various functions and aspects of multiple DSSs that could be beneficial to the process of NRP.
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Energy-efficient communication algorithms for wireless sensor networks
… that use the direct sequence spread spectrum (DSSS) transceivers with or without embedded chip interleaving are analyzed. The considered DSSS transceivers are compliant with the physical layer specifications in the IEEE 802.15.4 standard. The randomly deployed nodes are organized based on the …
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Enhanced Implementations for Arbitrary-Phase Spread Spectrum Waveforms
… than legacy direct sequence spread spectrum (DSSS) signals. Further, the unique ability to color the output signal spectrum offers new advantages to optimize transmission in a non-white frequency channel and to mitigate observed interference. In high data rate applications, the opportunity to …
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