| 基于差分编码的OFDM系统ICI消除方法的研究 |
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| 引用本文： | 刘解华,杨东凯,常青,张其善.基于差分编码的OFDM系统ICI消除方法的研究[J].电子与信息学报,2007,29(7):1529-1532. |
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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： | 北京航空航天大学电子信息工程学院,北京100083 |
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| 摘 要： | 在高速移动通信环境下，OFDM 系统在传输过程中出现的多普勒频移和收发两端本地振荡器之间的频率偏差，形成子载波间干扰(ICI)并造成系统性能降低。该文在分析子载波间干扰机制的基础上，从信道估计的角度提出了一种高效的ICI自消除差分编码方案。该方案提高了传统ICI自消除方案频谱利用率。仿真表明，在系统归一化频率偏差大于0.1时，该方案具有4 的信道估计增益，消除了因ICI带来的地板效应。
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| 关 键 词： | 正交频分复用 移动通信 子载波间干扰 差分编码 信道估计 |
| 文章编号： | 1009-5896（2007）07-1529-04 |
| 收稿时间： | 2005-12-28 |
| 修稿时间： | 2005-12-282006-05-15 |
Research on Inter-carrier Interference Cancellation Based on Differential Coding in OFDM System |
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| Liu Jie-hua,Yang Dong-kai,Chang qing,Zhang Qi-shan.Research on Inter-carrier Interference Cancellation Based on Differential Coding in OFDM System[J].Journal of Electronics & Information Technology,2007,29(7):1529-1532. |
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| Authors: | Liu Jie-hua Yang Dong-kai Chang qing Zhang Qi-shan |
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| Affiliation: | School of Electronic and Information Engineering, Beihang University, Beijing 100083, China |
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| Abstract: | For Orthogonal Frequency-Division Multiplexing (OFDM) communication systems with high mobile speed, the frequency offset caused by Doppler frequency offset and the frequency differences will introduce Inter-Carriers Interference (ICI), which degrades the performance. Based on the analysis of the interference mechanism of ICI, a high efficient ICI cancellation scheme based on differential coding in terms of channel estimation is introduced. This scheme improves the spectrum usage efficiency of ICI self-cancellation. And compared with the normal OFDM system, the proposed scheme has 4dB channel estimation improvement and avoid the error floor caused by ICI. |
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| Keywords: | OFDM Mobile communication ICI Differential coding Channel estimation |
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