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 16 of 16 for “"cyclic prefix"”.
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Ofdm system cyclic prefix characteristic analaysis for wimax technology
… the physical layer of WIMAX using the concept of cyclic prefix that adds additional bits at the transmitter end. The purpose of the cyclic prefix is to minimize the inter symbol interference and to improve the bit error rate. The MATLAB software is used to develop the OFDM model with cyclic prefix …
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Cyclic prefix assisted block transmission for low complexity communication system design
This thesis presents new results on cyclic prefix (CP) assisted block transmission for low complexity communication system design. Two important aspects are studied: the CP based low-complexity schemes for channel equalization and channel estimation. Specifically, based on the simple frequency …
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Advanced Orthogonal Frequency-Division Multiplexing Systems with Cyclic Prefix-Less Multiple-Input and Multiple-Output Discrete Fourier Transform Spreading and Unmanned Aerial Vehicles-Assisted Cyclic Postfixed Windowed Schemes
… Frequency-Division Multiplexing (OFDM)/Cyclic Prefix (CP)-less OFDM signal and reduction of baseband signal Out-of-Band (OOB) spectral power in the vicinity of boundaries of the transmission frequency band is very much essential. In the perspective of considering the non-compatibility of …
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A new data rotation syncrhonization scheme for CP based OFDM systems
… (OFDM) systems. We first analyze Beeka??s cyclic prefix (CP) based joint ML estimator [2] and find that its performance can be improved when the average energy of the CP increases. We then propose a new data rotation scheme, where we intentionally introduce a cyclic shift after the inverse …
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Spectrum Sensing in Cognitive Radio Networks
… scenario is studied. It is shown that the cyclic prefix correlation coefficient (CPCC)-based spectrum sensing algorithm, which was previously introduced as a simple and computationally efficient spectrum-sensing method for OFDM signals, is a special case of the constrained generalized …
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Design and performance of a flexible wavelet based multicarrier modulation for wireless communications
… comparison with the extremely efficient cyclic based OFDM equalisation method is made. As it is equally important for the successful deployment of commercial systems, characterisation of WPM performance under common system distortion such as sampling frequency offset and power amplifier …
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Analysis of Jamming-Vulnerabilities of Modern Multi-carrier Communication Systems
… we advanced to propose more novel attacks on the Cyclic Prefix (CP) of SC-FDMA. The associated countermeasures developed prove to be very effective to restore the system. We are first to consider the effect of frequency-selectivity and fading correlation of channel on the achievable rates of the …
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Fault Tolerance Aspects of Virtual Massive MIMO Systems
… which represents the alternative to the standard Cyclic Prefix OFDM providing superior detection quality. The generalization of Unique Word OFDM to a MIMO system is performed which allows interpretation as a virtual massive MIMO system with only few physical antennas. Detection methods for the …
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Channel Related Optimization of Wireless Communication Systems
… during a symbol and energy loss due to the cyclic prefix are regarded. This expression is used to optimize the number of sub-channels, and thereby the sub-channel bandwidth (sub-channel spacing) in the system. It is argued that the system can be optimized neglecting the effect of imperfect …
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Exploring the Sensing Capability of Wireless Signals
… Multiplexing (OFDM) structure including pilots, cyclic prefix, and preambles. The induced cyclic frequencies is then applied to the signal-selective direction estimation problem. Second, based on the analysis of wireless signal attributes, we design and implement a prototype of a single device …
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Orthogonal Generalized Frequency Division Multiplexing (OGFDM)
… frequency division multiplexing (GFDM) and cyclic-prefix orthogonal frequency division multiplexing (CP-OFDM). The main feature of the OGFDM is developing the physical layer of future mobile networks by achieving the orthogonality between non-orthogonal filters, removing the interference …
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Advanced methods in automatic modulation classification for emerging technologies
… test is then applied to estimate OFDM cyclic prefix duration. A two-phase searching scheme, which is based on Fast Fourier Transform (FFT) as well as Gaussianity test, is devised to detect the number of subcarriers. In the first phase, a coarse search is carried out iteratively. The …
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Adaptive interference suppression algorithms for DS-UWB systems
… the MMSE linear detection strategy and employ a cyclic prefix. In the SCE scheme, we perform the adaptive channel estimation in the frequency-domain and implement the despreading in the time-domain after the FDE. In this scheme, the MMSE detection requires the knowledge of the number of users and …
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Modeling and Analysis of Synchronization Schemes for the TDMA Based Satellite Communication System
… and the robustness of different lengths of cyclic prefix (CP) of the preamble.
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Techniques to Improve the Efficiency of Data Transmission in Cable Networks
… allows OFDM transmission without the use of a cyclic prefix (CP). The structure of OFDM in the current DOCSIS 3.1 does not achieve the maximum throughput if the channel has multipath components. The multipath channel causes inter-symbol-interference (ISI), which is commonly mitigated by …
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Secure Machine Learning Based RF Signal Classification for Wireless Systems
… long-term periodic features, such as the cyclic prefix (CP). Subsequently, the output of this classifier serves as a latent variable for a second-stage protocol classifier. By applying multi-layer perceptrons at these two stages, the proposed approach can effectively reduce the number of …