基于差分编码的OFDM系统ICI消除方法的研究
doi: 10.3724/SP.J.1146.2005.01698
Research on Inter-carrier Interference Cancellation Based on Differential Coding in OFDM System
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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。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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