| | | Document Type | : | Latin Dissertation | | Language of Document | : | English | | Record Number | : | 53320 | | Doc. No | : | TL23274 | | Call number | : | 3343707 | | Main Entry | : | Seyed Mohammad Navidpour | | Title & Author | : | Coding for broadband communication systemsSeyed Mohammad Navidpour | | College | : | The Pennsylvania State University | | Date | : | 2006 | | Degree | : | Ph.D. | | student score | : | 2006 | | Page No | : | 164 | | Abstract | : | Fast Internet access is growing from a convenience into a necessity in all aspects of our daily lives. Unfortunately, this has been held back by the high expenses of wiring infrastructure essential to deliver such high-speed internet access to the private homes and small offices. This problem is known as the last mile problem which has been an active area of research throughout research community. In this thesis we consider two different approaches to address this problem. Wireless optical communications, also known as free-space optical (FSO) communications, is a cost-effective and high bandwidth access technique. One major impairment over wireless optical links is the atmospheric turbulence, which occurs as a result of the variations in refractive index due to inhomogeneities in temperature and pressure fluctuations. In this thesis error control coding as well as diversity techniques in conjunction with multirate fractal modulation will be used over wireless optical links to improve the error rate performance. Powerline Communication is another candidate in the list of solutions for the last mile problem. Originally designed for power delivery rather than signal transmission, power line has many non-ideal properties as a communications medium. In the next part of the thesis, we will first review the low voltage (LV) power-line channel model and noise characteristics, where two major problems are the multipath fading and impulsive noise. We will discuss different approaches to address these problems. Orthogonal Frequency Division Multiplexing (OFDM) is considered to tackle the frequency selectivity of channel under different conditions. To address impulsive noise concatenated coding and also impulsive noise cancellation had been suggested. Also, appropriate mathematical analysis is presented to support the simulations. | | Subject | : | Applied sciences; Channel coding; Free-space optics; OFDM; Powerline communication; Raptor codes; Wireless optical communication; Electrical engineering; 0544:Electrical engineering | | Added Entry | : | M. Kavehrad | | Added Entry | : | The Pennsylvania State University |
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http://lib.clisel.com/site/catalogue/53320
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