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 20 for “"Cyclostationarity"”.
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Cyclostationarity Feature-Based Detection and Classification
Cyclostationarity feature-based (C-FB) detection and classification is a large field of research that has promising applications to intelligent receiver design. Cyclostationarity FB classification and detection algorithms have been applied to a breadth of wireless communication signals — analog and …
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Exploiting Cyclostationarity for Radio Environmental Awareness in Cognitive Radios
The tremendous ongoing growth of wireless digital communications has raised spectrum shortage and security issues. In particular, the need for new spectrum is the main obstacle in continuing this growth. Recent studies on radio spectrum usage have shown that pre-allocation of spectrum bands to …
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Advanced classification of OFDM and MIMO signals with enhanced second order cyclostationarity detection
… the first part. Particularly, the second order cyclostationarity based methods have been examined and improved. Based on the fact that most of the cyclostationary communication signals has a real cyclostationary part and a complex non-cyclostaionary part, we suggest an approach that enhance the …
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Time dependent adaptive filters for interference cancellation in CDMA systems
… systems. Traditionally, the exploitation of cyclostationarity in digital communications signals has been reserved for the hostile communication environments faced by the military. However, the advent of cost-effective, high-speed DSP chips and associated processing hardware have made Time …
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Electromagnetic Vector-Sensor Direction-of-Arrival Estimation in the Presence of Interference
… Additionally, two algorithms, one based on cyclostationarity and the other based on fourth-order cumulants, are formulated based on the UVS-ESPRIT algorithm and are capable of selectively estimating the source DOA in the presence of interference based on the statistical properties of the …
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Multitaper Methods for Cyclostationary Feature Detection in Time Series Data: Application to ACE Interplanetary Magnetic Field Data
… proposed statistical tests for the presence of cyclostationarity in time series data. Moreover, it is hypothesized here that interplanetary magnetic field data collected at ACE is almost-cyclostationary and this thesis aims to determine a set of low-frequency periodic components of its …
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Exploring the Sensing Capability of Wireless Signals
… signal attributes analysis. Specifically, the cyclostationarity properties of wireless signals are studied. Taking WiFi signals as an example, we propose signal cyclostationarity models induced by WiFi Orthogonal Frequency Division Multiplexing (OFDM) structure including pilots, cyclic prefix, …
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An eigenstructure technique for direct sequence spread spectrum synchronization
… The eigenstructure technique exploits the cyclostationarity property of the DSSS signal. It can theoretically provide perfect code estimates for signals received in arbitrary levels of white background noise and with arbitrary timing offsets and is insensitive to frequency offsets on the …
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The dual-polarization radar signature of a wind turbine: characterization and suppression
… of the turbine---specifically, its cyclostationarity---are exploited to implement a temporal suppression method to mitigate wind turbine clutter. Using the cyclostationary characteristics, 15-20 dB of suppression of the turbine blades' signature is demonstrated. A field experiment …
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Doppler spread estimation in mobile fading channels
… robust to different channel variations. Finally, cyclostationarity-based speed estimators which can be applied either blindly or with the aid of pilot data, are developed. A unified framework for the performance analysis of well-known crossing and covariance based speed estimation techniques is …
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Blind recognition of analog modulation schemes for software defined radio
… cognitive radios. In this dissertation, a Cyclostationarity-Based Decision Tree classifier is developed to separate between analog modulations and digital modulations, and classify signals into several subsets of modulation types. In order to further recognize the specific modulation type …
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A CMA-FRESH Whitening Filter for Blind Interference Rejection
… canceling the interference by exploiting its cyclostationarity. It learns the cyclostationary characteristics of the interferer blindly, through a property restoration algorithm which aims to drive the spectrum to white noise. The property restoration algorithm, inspired by the constant …
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Channel modeling and interference rejection for CDMA automatic vehicle monitoring systems
… adaptive filter. It is able to fully exploit the cyclostationarity and spectral correlation in certain DS-SS signals. It is shown how multiple AVM service providers can exist in adjacent channels within the ISM band. It is demonstrated that using the realistic channel models the TDAF can provide …
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A Study of Interference Suppression Using Deep Learning Methods
… suppression performance by exploiting cyclostationarity properties of our desired signal to our advantage. One of the important contributions in this work involves carrying out thorough analysis with respect to the generalization capability of CNN-AE for different types of interference …
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Automatic modulation classification of communication signals
… is based on digital communication signals' cyclostationarity related to the symbol rate. In order to adapt to the unknown symbol rate as well as the unknown excess bandwidth, the received signal is first filtered by using a bank of filters. Symbol rate candidates and their associated …
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Eigenspace Approach to Specific Emitter Identification of Orthogonal Frequency Division Multiplexing Signals
Specific emitter identification is a technology used to uniquely identify a class of wireless devices, and in some cases a single device. Minute differences in the implementation of a wireless communication standard from one device manufacturer to another make it possi- ble to extract a wireless …
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AMPS co-channel interference rejection techniques and their impact on system capacity
With the rapid and ubiquitous deployment of mobile communications in recent years, cochannel interference has become a critical problem because of its impact on system capacity and quality of service. The conventional approach to minimizing interference is through better cell planning and design. …
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Cyclostationary Methods for Communication and Signal Detection Under Interference
In this dissertation novel methods are proposed for communicating in interference limited environments as well as detecting such interference. The methods include introducing redundancies into multicarrier signals to make them more robust, applying a novel filtering structure for mitigating radar …
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Wideband Autonomous Cognitive Radios: Spectrum Awareness and PHY/MAC Decision Making
The cognitive radios (CRs) have opened up new ways of better utilizing the scarce wireless spectrum resources. The CRs have been made feasible by recent advances in software-defined radios (SDRs), smart antennas, reconfigurable radio frequency (RF) front-ends, and full-duplex RF front-end …
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Statistical Analysis of Wireless Systems Using Markov Models
Being one of the fastest growing fields of engineering, wireless has gained the attention of researchers and commercial businesses all over the world. Extensive research is underway to improve the performance of existing systems and to introduce cutting edge wireless technologies that can make high …