Pilot-Symbol Assisted Power Delay Profile Estimation for MIMO-OFDM Systems

Kolla Srinivasa Sankar, K suresh


In this paper a power delay profile (PDP) estimation technique is proposed for the  linear minimum mean square error (LMMSE) channel estimator of multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems. These systems can make full use of the channel correlations in space, time, and frequency to estimate the channel state information for various systems, including pilot-symbol- assisted systems, pilot-embedded systems, and blind systems. For practical applications, only the pilot symbols of all transmit antenna ports are used in estimating the PDP. The distortions caused by null sub carriers and an insufficient number of samples for PDP estimation are also considered. The proposed technique effectively reduces the distortions for accurate PDP estimation. Simulation results show that the performance of LMMSE channel estimation using the proposed PDP estimate approaches that of Wiener filtering due to the mitigation of distortion effects.


PDP,MIMO, OFDM, Channel Estimation,LMMSE, Weiner filter


A. Milewski, “Periodic sequences with optimal properties for channel estimation and fast start-up equalization,” IBM Journal of Research and Development, Vol. 27, No. 5, Sept. 1983, pp. 426-431.

S.N. Crozier, D.D. Falconer and S.A. Mahmoud, “Least sum of squared errors (LSSE) channel estimation,” IEE Proceedings-F, Vol. 138, No. 4, Aug. 1991, pp. 371-378.

C. Tellambura,M.G. Parker,Y.J. Guo, S.J. Shepherd and S.K. Barton, “Optimal sequences for channel estimation using discrete Fourier transform techniques,” IEEE Trans. Commun., Feb. 1999, pp. 230-238.

W. Chen and U. Mitra, “Training sequence optimization: Comparison and an alternative criterion,” IEEE Trans. Commun., Vol. 48, No. 12, Dec. 2002, pp. 1987-1991.

[W. H. Mow, “A New Unified Construction of Perfect Root-of-Unity Sequences,” Proc. Spread Spectrum Techniques and its Applications (ISSSTA’96), Mainz, Germany, pp. 955-959, 1996.

J.C.L. Ng, K.B. Letaief, and R.D. Murch, “Complex Optimal Sequences with ConstantMagnitude for Fast ChannelEstimation Initialization,” IEEE Trans. Commun., Vol. 46, N0. 3, Mar. 1998, pp. 305-308.

A. Ghosh, D. R. Wolter, J. G. Andrews, and R. Chen, "Broadband wireless access with WiMax/802.16: current performance benchmarks and future potential," IEEE Communications Magazine, vol. 43, pp. 129-136, 2005.

D. Gesbert, M. Shafi, S. Da-shan, P. J. Smith, and A. Naguib, "From theory to practice: an overview of MIMO space-time coded wireless systems," IEEE Journal on Selected Areas in Communications, vol. 21, pp. 281-302, 2003

R. Negi and J. Cioffi, “Pilot tone selection for channel estimation in a mobile OFDM system,” IEEE Trans. Consumer Electronics, Vol. 44, No. 3, pp. 1122-1128,Aug., 1998.

J.H. Manton, “Optimal training sequences and pilot tones for OFDM systems,” IEEE Commun. Let., Vol. 5, No. 4, Apr. 2001, pp. 151-153.

S. Adireddy, L. Tong, and H. Viswanathan, “Optimal Placement of Training for Frequency-Selective Block-Fading Channels,” IEEE Trans. Info. Theory, Vol. 48, No. 8, Aug. 2002, pp. 2338-2353.

M. Dong and L. Tong, “Optimal design and placement of pilot symbols for channel estimation,” IEEE Trans. Signal Processing, Vol. 50, No. 12, Dec. 2002, pp. 3055-3069.

X. Ma, L. Yang, and G. B. Giannakis, “Optimal training for MIMO frequency-selective fading channels,” IEEE Asilomar Conf. on Signals, Systems, and Computers, Nov. 2002, pp. 1107-1111.

[S. Ohno and G. B. Giannakis, “Optimal training and redundant precoding for block transmissions with application to wireless OFDM,” IEEE Trans. Commun., Vol. 50, No. 12, Dec. 2002, pp. 2113-2123.

C. Fragouli, N. Al-Dhahir, andW. Turin, “Training-based channel estimation for multiple antenna broadband transmissions,” IEEE Trans. Wireless Commun., Vol. 2, No. 2, Mar. 2003, pp. 384-391.

V. Syrjala and M. Valkama, “Jitter mitigation in high-frequency band pass sampling OFDM radios,” in Proc. WCNC 2009, pp. 1-6.

K. N. Manoj and G. Thiagarajan, “The effect of sampling jitter in OFDM systems,” in Proc. IEEE Int. Conf. Commun., vol. 3, pp. 2061-2065, May 2003.

Unnava Divya and Koteswarararao Seelam “REDUCTION OF EFFECT OF TIMING JITTER ON HIGH SPEED OFDM SYSTEM USING OVER SAMPLING TECHNIQUE” in International Journal of Research in Advent Technology (IJRAT) Vol. 1, No. 3, October 2013,

R. Horn and C. Johnson, Matrix Analysis. Cambridge University Press, 2009.

Full Text: PDF [FULL TEXT]


  • There are currently no refbacks.

Copyright © 2012, All rights reserved.| ijrcct.org

Creative Commons License
International Journal of Research in Computer and Communication Technology Advance Technology is licensed under a Creative Commons Attribution 3.0 Unported License.Based on a work at IJRCCT , Permissions beyond the scope of this license may be available at http://creativecommons.org/licenses/by/3.0/deed.en_GB.