| 航空移动通信中OFDM信道估计方法的研究 |
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| 引用本文： | 刘解华,杨东凯,常青,张其善.航空移动通信中OFDM信道估计方法的研究[J].航空学报,2007,28(2):380-384. |
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| 作者姓名： | 刘解华 杨东凯 常青 张其善 |
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| 作者单位： | 北京航空航天大学202教研室,北京,100083 |
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| 摘 要： | 正交频分复用（OFDM）由于其自身的技术优势使其在未来的航空移动通信中将占有重要地位，但航空移动通信中时变的信道环境和多普勒频移造成的严重的子载波之间干扰（ICI），使OFDM在航空移动通信中应用面临着困难。本文在建立航空移动通信通用信道模型的基础上，分析了ICI和噪声对信道估计的干扰机制，采用低通滤波和线性插值的方式对最小平方信道估计方法（LS）加以改进，抑制了ICI和信道噪声对LS〖JP2〗的干扰。经过仿真证明，该方法实现简单，精度高，抗ICI干扰和噪声能力强，满足了移动速度高达1 500 km/h的航空通信的要求。
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| 关 键 词： | 正交频分复用 航空移动通信 多普勒频移 低通滤波 信道估计 |
| 文章编号： | 1000-6893(2007)02-0380-05 |
| 修稿时间： | 2005年12月5日 |
Research on Channel Estimation of OFDM Systems in Aviation Mobile Communications |
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| LIU Jie-hua,YANG Dong-kai,CHANG Qing,ZHANG Qi-shan.Research on Channel Estimation of OFDM Systems in Aviation Mobile Communications[J].Acta Aeronautica et Astronautica Sinica,2007,28(2):380-384. |
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| Authors: | LIU Jie-hua YANG Dong-kai CHANG Qing ZHANG Qi-shan |
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| Institution: | Faculty 202, Beijing University of Aeronautics and Astronautics |
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| Abstract: | Orthogonal frequency division multiplexing (OFDM) will be widely used in aviation mobile communications for its own advantages,but the complex channel environment and the inter-carriers interference (ICI) caused by Doppler frequency offset will do harm to its performance.Based on the general channel model of aviation mobile communications, the ICI mechanism is analyzed, and the lowpass filtering in frequency domain is adopted to restrain the influence from ICI and channel noise to affect the least square (LS) channel estimation based on comb-type pilot tone.Through simulation,the improved LS meets the demand of aviation mobile communications with mobile speed up to 1 500 km/h because of its high estimation precision,strong resistance to ICI and easy realization. |
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| Keywords: | OFDM aviation mobile communication Doppler frequency offset lowpass filter channel estimation |
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