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 5 of 5 for “"orthogonal frequency division multiplex"”.
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An Investigation of Orthogonal Wavelet Division Multiplexing Techniques as an Alternative to Orthogonal Frequency Division Multiplex Transmissions and Comparison of Wavelet Families and Their Children
… use of the Discrete Fourier Transform in OFDM (Orthogonal Frequency Division Multiplex) is no exception. The restriction on further development of OFDM lies primarily within the type of transform it uses in the heart of its system, Fourier transform. OFDM suffers from sensitivity to Peak to …
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Effect of Doppler shift on adaptive OFDM modulation for cognitive radio application
… thesis, the effect of Doppler shift on adaptive orthogonal frequency-division multiplex (OFDM) modulation in a cognitive radio (CR) application is investigated. We present Monte Carlo simulations of OFDM modulation in which a group or groups of subcarriers are modulated using quadrature …
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Design and performance of a flexible wavelet based multicarrier modulation for wireless communications
… modulation based on anything else than Orthogonal Frequency Division Multiplex (OFDM). This thesis analyses the design and performance of the Wavelet Packet Modulation (WPM), an alternative multicarrier modulation based on the wavelet packet transform. While swapping sine waves for …
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Channel Related Optimization of Wireless Communication Systems
… of systems based on multicarrier techniques and orthogonal frequency division multiplex, OFDM, but some of the problems apply to single carrier systems as well. The influence of different pilot patterns is analyzed when pilot symbol assisted modulation, PSAM, is used in OFDM systems. It is …
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Iterative receivers with channel estimation for MIMO and multi-user OFDM systems
… algorithms for an uplink multi-user MIMO orthogonal frequency division multiplex (OFDM) system. For the given receiver structure, different combinations of multi-user detectors (MUD) and decision-directed channel estimators are compared. The comparison focuses on the complexity-performance …