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Volume 31 Issue 4
Dec.  2010
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Hu Die, He Liang-hua. An Improved Approach of Pilot Design for MIMO OFDM Systems[J]. Journal of Electronics & Information Technology, 2009, 31(4): 870-873. doi: 10.3724/SP.J.1146.2007.01995
Citation: Hu Die, He Liang-hua. An Improved Approach of Pilot Design for MIMO OFDM Systems[J]. Journal of Electronics & Information Technology, 2009, 31(4): 870-873. doi: 10.3724/SP.J.1146.2007.01995

An Improved Approach of Pilot Design for MIMO OFDM Systems

doi: 10.3724/SP.J.1146.2007.01995
  • Received Date: 2007-12-29
  • Rev Recd Date: 2008-06-10
  • Publish Date: 2009-04-19
  • For Multi-Input Multi-Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) systems with virtual subcarriers, conventional equispaced pilot tones are no longer applicable in some situations. To obtain the optimal pilot sequence in such cases, this paper proposes an improved pilot-design approach based on the criterion of minimum Mean-Square-Error (MSE) of the Least Squares (LS) channel estimate. The proposed approach can quickly and efficiently find the optimal pilot sequence, or suboptimal pilot sequences when the optimal ones do not exist. The simulation results demonstrate the effectiveness of the proposed approach.
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  • Bcskei H, Gesbert D, and Paulraj A J. On the capacity ofOFDM based spatial multiplexing systems. IEEE Trans. onCommun., 2002, 50(2): 225-234.[2]Minn H and Al-Dhahir N. Optimal training signals for MIMOOFDM channel estimation. IEEE Trans. on WirelessCommunications, 2006, 5(5): 1158-1168.[3]Cosovic I and Auer G. Capacity achieving pilot design forMIMO-OFDM over time-varying frequency-selectivechannels. In Proc. IEEE Intern. Conf. Commun. (ICC?7),Glasgow, Scotland, June 2007: 779-784.[4]Barhumi I, Leus G, and Moonen M. Optimal training designfor MIMO OFDM systems in Mobile wireless channels[J].IEEETrans. on Signal Processing.2003, 51(6):1615-1624[5]Ohno S and Giannakis G B. Capacity maximizingMMSE-optimal pilots for wireless OFDM overfrequency-selective block Rayleigh-fading channels[J].IEEETrans. on Information Theory.2004, 50(9):2138-2145[6]Sari H, Karam G, and Jeanclaude I. Transmission techniquesfor digital terrestrial TV broadcasting. IEEE Commun.Magazine, 1995, 33(2): 100-109.[7]Coon J P and Sandell M. Constrained optimization of MIMOtraining sequences. EURASIP Journal on Advances in SignalProcessing, 2007, Art. No. 80857.[8]Hu D, Yang L X, Shi Y H, and He L H. Optimal pilotsequence design for channel estimation in MIMO OFDMsystems[J].IEEE Commn. Lett.2006, 10(1):1-3
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