In this thesis, we investigate and implement the channel estimation schemes for digital video broadcasting - handheld (DVB-H) and IEEE 802.16d world interoperability for micro-wave access (WiMAX). Both systems are based on the orthogonal frequency division multiplexing (OFDM) technique. The performance of the channel estimation schemes is first verified by using simulation experiments. Then, the channel estimation algorithms are realized by hardware implementation.
For the DVB-H systems, since the mobile device may have a relatively high speed, the channel condition is time-varying, leading to serious degradation in channel estimation. In this thesis, the decision feedback mechanism is adopted to improve the performance of the channel estimation. The adopted structure for channel estimation is realized by using Verilog hardware description language (HDL). Then, all the baseband signal processing related algorithms, which include timing synchronization, frequency offset estimation/compensation, and scattered pilot detection, are integrated together using 0.18 ASIC process.
For the IEEE 802.16d WiMAX, since it is dedicated for fixed wireless applications, the channel condition is basically stationary and easier to obtain. Therefore, the decision feedback mechanism is not adopted to save hardware complexity. The system performance is verified by conducting simulation experiments. The adopted channel estimation algorithm is implemented by using Verilog HDL. Finally, the whole baseband receiver is realized by using the field programmable gate array (FPGA) and verified by using the Agilent logic analyzer.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0827107-142630 |
| Date | 27 August 2007 |
| Creators | Yu, Chih-kai |
| Contributors | Yang-fang Chen, Chih-peng Li, Shiann-shiun Jeng |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0827107-142630 |
| Rights | not_available, Copyright information available at source archive |
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