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基于差分编码的OFDM系统ICI消除方法的研究 被引量：4

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4dB的信道估计增益,消除了因ICI带来的地板效应。 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.
作者 刘解华 杨东凯 常青 张其善
机构地区 北京航空航天大学电子信息工程学院
出处 《电子与信息学报》 EI CSCD 北大核心 2007年第7期1529-1532,共4页 Journal of Electronics & Information Technology
基金 航空科学基金(04F51068)资助课题
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 OFDM Mobile communication ICI Differential coding Channel estimation
分类号 TN929.5 [电子电信—通信与信息系统]
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参考文献9

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同被引文献31

  • 1Li Y, Cimini L J, Jr. Bounds on the interchannel interference of OFDM in time - varying impairments [ J ]. IEEE Tans. on Commun. , 2001, 49(3), 401 -404.
  • 2Armstrong J. Analysis of new and existing methods of reducing intercarrier interference due to carrier frequency offset in OFDM[J]. IEEE Trans. on Commtm. , 1999, 47(3), 365-369.
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  • 4MULLER WEINFURTNER S H. Optimum Nyquist windowing in OFDM receivers[J]. IEEE Trans. on Commun. , 2001,49 (3) :417 - 420.
  • 5Zhao Y, Haggman S. Intercarrier interference self - cancellation scheme for OFDM mobile communication sys- tems [ J ]. IEEE Trans. on Commun. ,2001,49 (7), 1185 - 1191.
  • 6YANG B G, LETMEF K B, CHENG R S, et al. Windowed DFT based pilot - symbol - aided channel estimation for OFDM systems in multipath fading channels [ C ]//Proc. of IEEE VTC. IEEE,2000:1480 - 1484.
  • 7Yu F, Tellambura C, Krzymie' W A. Transmitter precoding for ICI reduction in closed-loop MIMO OFDM systems. IEEE Transactions on Vehicular Technology, 2007, 56( 1): 115- 125
  • 8Schniter P. Low-complexity equalization of OFDM in doubly selective channels. IEEE Transactions on signal processing, 2004, 52(4): 1002-1011
  • 9Muller-Weinfurtner S H. Optimum nyquist windowing in OFDM receivers. IEEE Transactions on communications, 2001, 49(3): 417-420
  • 10Sathananthan K, TeUambura C. Partial transmit sequence and selected mapping schemes to reduce ICI in OFDM systems. IEEE Communications Letters, 2002, 6(8): 313-315

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电子与信息学报
2007年 第7期

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