碩士 / 國立臺北科技大學 / 電機工程系研究所 / 102 / The orthogonal frequency division multiplexing (OFDM) system has many advantages including high data transmission rate and is robust to the frequency selective fading channel, which make OFDM a popular wireless communication technology in the past decades. As known, accurate channel state estimation is one of the most important goals for system performance enhancement. For the uplink OFDMA system, the base station receives multiple signals from different users which result in the multiple access interference (MAI), and thus increases the difficulty in channel state estimation. As compared to the blind channel estimation, the pilot symbol-based method can attain better estimation results. In this study, an adaptive filter together with five simple pilot symbol arrangements, which consists of system 1, 2, 3, 4, and 5, are presented. A series of simulations is conducted in the Rayleigh fading channel. The results show that system 2, 3, 4 and 5 can effectively reduce the MAI. Among them, system 5 achieves the best performance.
| Identifer | oai:union.ndltd.org:TW/102TIT05442020 |
| Date | January 2014 |
| Creators | Chia-Chi Sung, 宋家齊 |
| Contributors | Tan-Hsu Tan, 譚旦旭 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | en_US |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 63 |
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