PAPR Reduction and asynchronous multiplexing with CCK Non-maximally decimated filter banks in OFDM systems
First is presented an introduction to mobile communications, OFDM (Orthogonal Frequency Division Multiplexing), the FFT (Fast Fourier Transform), perfect reconstruction and efficient implementation in filter banks, finalizing with channelizer systems. The advantages and disadvantages of OFDM are ela...
| Autor: | |
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| Tipo de recurso: | tesis de maestría |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2016 |
| País: | México |
| Institución: | Instituto Nacional de Astrofísica, Óptica y Electrónica |
| Repositorio: | Repositorio Institucional del INAOE |
| Idioma: | inglés |
| OAI Identifier: | oai:inaoe.repositorioinstitucional.mx:1009/835 |
| Acceso en línea: | http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/835 |
| Access Level: | acceso abierto |
| Palabra clave: | info:eu-repo/classification/Transmultiplexer/Transmultiplexer info:eu-repo/classification/PAPR/PAPR info:eu-repo/classification/CCK/CCK info:eu-repo/classification/OFDM/OFDM info:eu-repo/classification/cti/1 info:eu-repo/classification/cti/22 info:eu-repo/classification/cti/2203 |
| Sumario: | First is presented an introduction to mobile communications, OFDM (Orthogonal Frequency Division Multiplexing), the FFT (Fast Fourier Transform), perfect reconstruction and efficient implementation in filter banks, finalizing with channelizer systems. The advantages and disadvantages of OFDM are elaborated in order to introduce a principal subject of our investigation, which is the channelization technique using non-maximally decimated polyphase filter banks based on the state-of-the-art from the literature. The channelizer is designed using a polyphase structure followed by an FFT block to modulate a prototype filter and thus implement N filters for the price of one, reducing significantly the workload of the system. Orthogonal Frequency Division Multiplexing (OFDM) is adapted to the channelizer in order to test isolation between mobile stations (MS) when a communication link is established with the base station (BS). Typical synchronization techniques used in Wireless Local Area Network (WLAN) systems like frame detection and channel estimation is employed to test the correct operation and performance of the entire communication system. Peak to Average Power Ratio (PAPR) is reduced by using a codification technique based on polyphase complementary codes which is adapted to the OFDM modulator. The results are verified by simulations in MATLAB, ModelSim and FPGA implementation. |
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