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基于信道编码直接判决解调算法的OFDM信道估计 被引量：2

Coded Decided Directed Demodulation Channel Estimation Methods for OFDM System
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摘要 针对 Mignone V.和 Morello A.提出的正交频分复用 OFDM( orthogonal frequency division multi-plex)系统编码直接判决解调 CD3( coded decided directed demodulation)信道估计算法在频率选择性信道下估计性能稍差 ,且对多普勒频移敏感的缺点 ,提出了两种改进算法。通过引入了 LMMSE信道估计器和鲁棒滤波器进行去噪滤波 ,改进 CD3- OFDM系统的信道估计性能。仿真表明 ,两种改进算法在不增加计算复杂度的情况下 ,提高了 CD3信道估计算法的性能 。 In connection with coded decision directed demodulation (CD3) channel estimation method for coherent demodulation of orthogonal frequency division multiplex (OFDM) presented by Mignone V. and Morello A., two kinds of improved channel estimation approaches are introuced.They make use of LMMSE estimator and robust filter to eliminate the noise effect in the channel estimation. The estimation performance can be improved by using these methods.
作者 杨炜伟 徐信 李子 蔡跃明
机构地区 解放军理工大学通信工程学院
出处 《解放军理工大学学报（自然科学版）》 EI 2004年第5期10-14,共5页 Journal of PLA University of Science and Technology(Natural Science Edition)
基金 江苏省自然科学基金资助项目 ( BK2 0 0 3 0 15 )
关键词 正交频分复用 信道估计 编码直接判决解调 线性最小均方误差 鲁棒滤渡 OFDM(orthogonal frequency elirision multiplex) channel estimation CD3(coded decision directed demodulation) LMMSE(linear minimura mean-squared error) robust filtering
分类号 TN435.1 [电子电信—微电子学与固体电子学]
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参考文献5

  • 1MIGNONE V, MORELLO A. CD3-OFDM:A novel demodulation scheme for fixed and mobile receivers[J]. IEEE Transactions on Communications, 1996, 44(9):1144-1151.
  • 2ALARD M, LASSALLE R. Principles of modulation and channel coding for digital broadcasting for mobile receivers[J]. EBU Tech Rev, 1987, 47(224): 168-190.
  • 3VAN B, EDFORS O, SANDELL M, WILSON S, et al. On channel estimation in OFDM system[A]. In: Proc. 45th IEEE Vehicular Technology Conf[C]. Chicago:Chicago IL, 1995.
  • 4LI Y, CIMINI J, SOLLENBERGER R. Robust channel estimation for OFDM systems with rapid dispersive fading channels[J]. IEEE Transaction on Communication, 1998,46(7):902-915.
  • 5MORELLI M. A comparison of pilot-aided channel estimation methods for OFDM system [J]. IEEE Tran Signal Processing, 2001, 49(12):3065-3073.

同被引文献14

  • 1WANG H, LIN Y, CHEN B. Data efficient blind OFDM channel estimation using receiver diversity[J]. IEEE Trans Signal Processing, 2003,51(6):2613-2624.
  • 2LUC D, AYADI J, SLOCK T M. Weighted and unweighted subspace fitting without eigendecomposition[A]. IEEE 5th Symposium on Communications and Vehicular Technology[C]. Netherlands: IEEE SCVT, 1997.
  • 3LUC D, AYADI J, SLOCK T M. Subspace fitting without eigendecomposition[A]. International Conference on Digital Signal Processing[C]. Greece: ICDSP, 1997.
  • 4CHUN J. Fast array algorithms for structured matrices[D]. Stanford: Information Systems Laboratory, Stanford University, 1989.
  • 5STOICA P, NG B C. On the Cramér-Rao bounds under parametric constraints[J]. IEEE Signal Processing Letters, 1998,5(7):177-179.
  • 6MUQUET B, WANG Z, GIANNAKIS G B, et al. Cyclic-prefix or zero-padding for multicarrier transmissions[J]. IEEE Trans Commun, 2002,50(12):2613-2624.
  • 7MUQUET B, DE COURVILE M, DUHAMEL P. Subspace-based blind and semi-blind channel estimation for OFDM systems[J]. IEEE Trans on Signal Processing, 2002,50(7):1699-1712.
  • 8MOULINES E, DUHAMEL P. Subspace method for the blind identification of multichannel FIR filters[J]. IEEE Trans Signal Processing, 1995,43(5):516-525.
  • 9CHOTIKAKAMTHORN N, SUZUKI B H. On identifiablility of OFDM blind channel estimation[A]. Proc VTC Amsterdam[C]. Netherlands: VTC, 1999.
  • 10ZHOU S, GIANNAKIS G B. Finite-alphabet based channel estimation for OFDM and related multicarrier systems[J]. IEEE Trans on Signal Processing, 2001,49(8):1402-1414.

引证文献2

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解放军理工大学学报（自然科学版）
2004年 第5期

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