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 159 for “"Spread Spectrum"”.
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Compressive Measurement of Spread Spectrum Signals
Spread Spectrum (SS) techniques are methods used in communication systems where the spectra of the signal is spread over a much wider bandwidth. The large bandwidth of the resulting signals make SS signals difficult to intercept using conventional methods based on Nyquist sampling. Recently, a …
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Power control for spread spectrum communications systems
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Spread spectrum for indoor wireless data communication
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1987.
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A local area network using spread spectrum techniques
… years. This thesis considers the application of Spread Spectrum (SB) communication techniques to the implementation of a LAN.
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Advanced Interference Suppression Techniques for Spread Spectrum Systems
… novel interference suppression algorithms for spread spectrum systems. Firstly we investigate blind constrained constant modulus (CCM) stochastic gradient (SG) receivers with a low-complexity variable step-size mechanism for downlink direct sequence CDMA (DS-CDMA) systems. This algorithm …
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Binary Sequences for Spread-Spectrum Multiple-Access Communication
Made available in DSpace on 2014-12-12T20:54:43Z (GMT). No. of bitstreams: 1 7804133.pdf: 4063265 bytes, checksum: 0dd59f8b61fff9c59c9e23de9da51c7c (MD5) Previous issue date: 1977
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Enhanced Implementations for Arbitrary-Phase Spread Spectrum Waveforms
The use of practically non-repeating spreading codes to generate sequence-based spread spectrum waveforms is a strong method to improve transmission security, by limiting an observers opportunity to cross-correlate snapshots of the signal into a coherent gain. Such time-varying codes, particularly …
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Spread spectrum satellite multiple access and overlay service
This thesis presents two applications of spread spectrum technology to very small aperture terminal (VSAT) satellite communication networks. It describes two spread spectrum multiple access systems which use a form of noncoherent M-ary FSK (MFSK) as the primary modulation and analyzes their …
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SPREAD SPECTRUM SYNCHRONIZATION USING MATCHED FILTER AND CYCLIC ACCUMULATION
Direct sequence spread spectrum communications have become an increasingly popular technique over the decades. Code phase acquisition is a critical and difficult operation in any spread spectrum system. Acquisition must be accomplished within a short period of time and at low signal to noise ratio …
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Implementation of a Software Defined Spread Spectrum Communication System
… to prototype a software defined direct sequence spread spectrum transceiver that can be used as a node in an ad hoc network. We introduce the concept of a software radio, the current state of art, and GNU Radio and its concepts. We discuss in detail the design and development methods of GNU Radio …
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Novel low cost synchronisation network for spread spectrum systems
Spread Spectrum systems are found in many flavours, used in many applications and have existed since the early days of radio communications. The properties of spread spectrum do however place restrictions on the design, and often make the implementation expensive and complex. When using spread …
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A nonlinear dynamic system for spread spectrum code acquisition
… more reliable, less expensive, and lower power Spread Spectrum (SS) code acquisition system for wireless receivers. A prohibitive factor in creating ubiquitous short range, digital radio transceivers is the difficulty and expense of creating a mechanism for locking onto the incoming Spread …
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Spread spectrum techniques for distributed multimeasurand optical fiber sensors
Spread spectrum techniques offer an alternate solution to the urgency for distributed optical fiber sensors. These techniques are based on the properties of pseudorandom sequences that have triangular autocorrelation functions with peaks only at regions of no delay. This affords an opportunity to …
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Physical Layer Design for a Spread Spectrum Wireless LAN
… a physical layer design for a direct sequence spread spectrum ISM band radio LAN system. This radio system employs spread spectrum communication technology and a differential binary phase shift keying/quadrature phase shift keying (BPSK/QPSK) non-coherent receiver to overcome the adverse indoor …
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Constrained Clustering for Frequency Hopping Spread Spectrum Signal Separation
Frequency Hopping Spread Spectrum (FHSS) signaling is used across many devices operating in both regulated and unregulated bands. In either situation, if there is a malicious device operating within these bands, or more simply a user operating out of the required specifications, the identification …
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An eigenstructure technique for direct sequence spread spectrum synchronization
An important aspect of all spread spectrum receivers is synchronization. The harsh radio environment has necessitated the development of fast and robust techniques. Current techniques for direct sequence spread spectrum (DSSS) synchronization, although rapid, are not robust to multiple access …
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Performance Evaluation of a Frequency Modulated Spread-Spectrum System
… for particular values of FM bandwidth and spread-spectrum processing gain. The capacity supported by the FM CDMA sysem is estimated with different levels of orthogonal as well as non-orthognal multiple access interference. The performance of the FM CDMA system in AWGN, multipath fading, …
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Fault location on EHV lines using wideband spread spectrum techniques
… tha quality of supply and reduce outage times. Spread spectrum techniques perform well in high noise environments such as power lines and their use in radar ranging is well known. Existing power line carrier (PLC) equipment may be used to transmit a direct sequence signal down a faulted EHV …
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