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Performance evaluation of fixed and variable zero padding length in ultra-wideband receiver design using MB-OFDM based on ECMA-368 standard

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dc.contributor.advisor Tahernezhadi, Mansour en_US
dc.contributor.author Varna, Geetha en_US
dc.date.accessioned 2017-08-02T21:16:19Z
dc.date.available 2017-08-02T21:16:19Z
dc.date.issued 2014
dc.identifier.uri http://commons.lib.niu.edu/handle/10843/17765
dc.description Advisors: Mansour Tahernezhadi. en_US
dc.description Committee members: Lichuan Liu; Donald S. Zinger. en_US
dc.description.abstract Traditional OFDM systems use Cyclic Prefix (CP) in front of an OFDM symbol to maintain orthogonality. Ultra Wide Band (UWB) systems use Multiband OFDM approach in implementing applications of Wireless Personal Area Network (WPAN). Federal Communications Commission (FCC) put some regulations on UWB to co-exist with other narrowband and spread spectrum users. MB-OFDM follows OFDM modulation scheme where CP is used but CP introduces a structure into the transmitter due to which the ripples are produced in Power Spectral Density (PSD). Because of this ripples, power back-off is required at the receiver which is as large as 1.5 dB. As an alternative to CP, Zero Padding (ZP) is used where a flat PSD is obtained which requires zero power back-off. Circular convolution in CP is a natural phenomenon but for ZP, Overlap and add method (OLA) is used to ensure circular convolution. The ZP length used for OLA method is fixed and equal to 32 samples according to ECMA-368. If timing synchronization estimation errors occur, fixed ZP length may cause Inter Symbol Interference (ISI). So, a variable ZP length is required to avoid ISI depending upon the current band. Hence, a Multi Band Timing Synchronization algorithm is proposed to achieve variable ZP length based on current band for OLA method. This method benefits large delay spread channels. Improvement in SNR is achieved at particular Bit Error Rate (BER) for large delay spread channels. en_US
dc.format.extent 56 pages en_US
dc.language.iso eng en_US
dc.publisher Northern Illinois University en_US
dc.rights NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors. en_US
dc.subject.lcsh Ultra-wideband devices en_US
dc.subject.lcsh Orthogonal frequency division multiplexing en_US
dc.subject.lcsh Wireless communication systems en_US
dc.subject.lcsh Electrical engineering en_US
dc.title Performance evaluation of fixed and variable zero padding length in ultra-wideband receiver design using MB-OFDM based on ECMA-368 standard en_US
dc.type Text en_US
dc.contributor.department Department of Electrical Engineering en_US
dc.description.degree M.S. (Master of Science) en_US


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