[1] Xu Xiaodong, Jing Ya, You Xiaohu,. MDL-based root-mean-squared delay spread estimationfor MIMO OFDM systems [J]. Journal of Southeast University (English Edition), 2004, 20 (4): 395-400. [doi:10.3969/j.issn.1003-7985.2004.04.001]
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MDL-based root-mean-squared delay spread estimationfor MIMO OFDM systems(
)
MIMO OFDM系统中基于MDL准则的 均方根时延扩展估计
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 20
- Issue:
- 2004 4
- Page:
- 395-400
- Research Field:
- Information and Communication Engineering
- Publishing date:
- 2004-12-30
Info
- Title:
- MDL-based root-mean-squared delay spread estimationfor MIMO OFDM systems
- MIMO OFDM系统中基于MDL准则的 均方根时延扩展估计
- Author(s):
- Xu Xiaodong; Jing Ya; You Xiaohu
- National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China
- Keywords:
- multi-input multi-output orthogonal frequency division multiplexing(MIMO OFDM); root-mean-squared(RMS)delay spread(RDS); frequency-selectivity; noise variance; minimum description length criterion
- PACS:
- TN929
- DOI:
- 10.3969/j.issn.1003-7985.2004.04.001
- Abstract:
- This paper studies the application of minimum description length(MDL)criterion for estimating root-mean-squared(RMS)delay spread(RDS)for MIMO OFDM systems. The analytic relationship between the powers and the correlation matrix of multipath components establishes the feasibility of the application of the MDL criterion to RDS estimation. The estimator presents both the estimate of instantaneous RDS and the estimates of noise variance, channel power and SNR of current channel with low computational complexity. Given the powers of the estimated multipath components, the MDL criterion is adopted to acquire the number of paths and the time delays of each path of current channel without making eigendecomposition of the correlation matrix normally required by MDL criterion, following which the noise variance and the power of each path can be estimated. The power delay profile(PDP)and RDS of the current channel are achieved. Simulation results show that the proposed estimator is insensitive to variance of SNR and robust against frequency-selectivity.
- 研究了MIMO OFDM系统中最小描述长度(MDL)准则在均方根时延扩展估计中的应用. 分析了多径分量功率和多径分量的自相关矩阵之间的关系, 使MDL可有效地应用于RDS估计. 该估计器能以较低的计算复杂度给出RDS、噪声方差、信道功率和信噪比等多个实时信道参数的准确估计. 根据估计的多径分量功率, 利用MDL准则获得了当前信道环境下的路径数及它们各自时延的估计; 根据路径数得到了噪声方差和各径功率的估计, 从而得到当前信道的功率时延谱和均方根时延扩展的估计. 仿真结果表明该估计器可有效对抗信道中信噪比变化和频率选择性的影响.
References:
[1] Hoeher P, Kaiser S, Robertson P. Two-dimensional pilotsymbol-aided channel estimation by Wiener filtering [A]. In: IEEE International Conference on Acoustics, Speech, and Signal Processing [C]. Munich, 1997, 3: 1845-1848.
[2] Mersereau R, Speake T. The processing of periodically sampled multidimensional signals[J]. IEEE Transactions on Acoustic, Speech and Signal Processing, 1983, 31(1): 188-194.
[3] Keller T, Hanzo L. Adaptive modulation techniques for duplex OFDM transmission[J]. IEEE Transactions on Vehicular Technology, 2000, 49(5): 1893-1906.
[4] Witrisal K, Kim Y H, Prasad R. Frequency-domain simulation and analysis of the frequency-selective ricean fading radio channel[A]. In: IEEE International Symposium on Personal, Indoor and Mobile Radio Communications [C]. Boston, 1998, 3: 1131-1135.
[5] Witrisal K, Kim Y H, Prasad R. RMS delay spread estimation technique using non-coherent channel measurements [J]. IEEE Electronics Letters, 1998, 34(20): 1918-1919.
[6] Witrisal K, Bohdanowicz A. Influence of noise on a novel RMS delay spread estimation method [A]. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications[C]. London, 2000, 1: 560-566.
[7] Arslan H, Yücek T. Estimation of frequency selectivity for OFDM based new generation wireless communication systems [A]. In: World Wireless Congress [C]. San Francisco, 2003.
[8] Crozier S N, Falconer D D, Mahmoud S A. Least sum of squared errors(LSSE)channel estimation [J]. Radar and Signal Processing, IEE Proceedings F , 1991, 138(4): 371-378.
[9] Wax M, Kailath T. Detection of signals by information theoretic criteria [J]. IEEE Transactions on Acoustics, Speech and Signal Processing, 1985, 33(2): 387-392.
[10] Barhumi I, Leus G, Moonen M. Optimal training sequences for channel estimation in MIMO OFDM systems in mobile wireless channels [A]. In: International Zurich Seminar on Broadband Communication, Access, Transmission and Networking [C]. Zurich, 2002. 44-1-44-6.
Memo
- Memo:
- Biographies: Xu Xiaodong(1975—), male, graduate; You Xiaohu(corresponding author), male, doctor, professor, xhyu@seu.edu.cn.