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標題: | 在高速鐵路環境下使用802.16正交分頻多工系統訊框格式之研究 A Study on Frame Format for 802.16d/e OFDM System in High Speed Train Environment |
作者: | Hsiu-Cheng Cheng 鄭旭城 |
指導教授: | 張進福 |
關鍵字: | 高速鐵路,OFDM,802.16,導航符號排列方式,鐵路環境特性, high speed rail,OFDM,802.16,pilot arrangement,characterization of rail environment, |
出版年 : | 2007 |
學位: | 碩士 |
摘要: | 隨著無線通訊與高速鐵路的迅速興起,在高鐵環境提供高傳輸速率的需求也跟著增加。OFDM技術由於對符碼間干擾有較高的抵抗力而能達到較高的資料速率,近來獲得廣泛的研究,包括IEEE 802.11與IEEE 802.16等標準皆將其納入最新的規範當中。而在不同的都卜勒頻率之下,利用導航符號協助之通道估測法的準確度將與導航符號的排列方式息息相關。本論文將首先描述導航符號排列方式對不同都卜勒頻率的影響,並透過模擬顯示802.16系統參數在高速移動下的效能表現。接著根據取樣定理與通道參數,我們設計一種新的導航符號排列方式並與傳統的802.16訊框格式比較。最後,我們利用鐵路環境可預測的特性試著增加系統效能。 With the rapid growth of wireless communications and high speed rail, the need for high speed data transmission in high speed train environment is increased. Orthogonal Frequency Division Multiplexing (OFDM) is recently becoming very popular for achieving high data rates due to its resistance to ISI. OFDM has also been chosen as the transmission method for many standards, such as the IEEE 802.11 and 802.16. The accuracy of pilot-aided channel estimation at a desired Doppler frequency is highly dependent on how the pilots are arranged. In this paper, we describe the effect of Doppler frequency on different pilot arrangements in wireless OFDM systems and simulate the performance using the parameters of the IEEE 802.16 standard in high mobility environment. According to sampling theorem and channel parameters, we propose a new pilot insertion scheme and compare it with conventional 802.16 frame format. In the end, we use characterization of rail environment to improve system performance. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/27942 |
全文授權: | 有償授權 |
顯示於系所單位: | 電信工程學研究所 |
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