O. Edfors, M. Sandell, J. J. Van de Beek, S. K. Wilson and P. O. Borjesson, “OFDM Channel Estimation by Singular Value Decomposition,” IEEE Transactions on Communications, Vol. 46, No. 7, 1998, pp. 931-939. doi:10.1109/26.701321
 G. Taubock and F. Hlawatsch, “A Compressed Sensing Technique for OFDM Channel Estimation in Mobile Environments: Exploiting Channel Sparsity for Reducing Pilots,” IEEE International Conference on Acoustics, Speech and Signal Processing, Las Vegas, 31 March-4 April 2008, pp. 2885-2888.
 S. Bae, Y. Jang, S. Shin, Z. Chengshi and K. Kwak, “Two Dimentional Estimations with Reduced Pilot Arrangements for OFDM Systems,” Advanced Communication Technology International Conference, Phoenix Park, 1518 February 2009, pp. 503-506.
 M. Chang and T. D. Hsieh, “Detection of OFDM Signals in Fast-Varying Channels with Low-Density Pilot Symbols,” IEEE Transactions on Vehicular Technology, Vol. 57, No. 2, 2008, pp. 859-872. doi:10.1109/TVT.2007.906369
 J. Byng and N. P. Natarajan, “Adaptive Pilot Utilization for OFDM Channel Estimation in a Time Varying Channel,” IEEE 10th Annual Wireless and Microwave Technology Conference, Clearwater, 20-21 April 2009, pp. 1-5.
 S. Lee, K. Kwak, J. Kim and D. Hong, “Channel Estimation Approach with Variable Pilot Density to Mitigate Interference over Time-Selective Cellular OFDM Systems,” IEEE Transaction on Wireless Communications, Vol. 7, No. 7, 2008, pp. 2694-2704.
 S. Ohno, E. Manasseh and M. Nakamoto, “How Many Known Symbols Are Required for Linear Channel Estimation in OFDM?” IEEE International Conference on Acoustics, Speech and Signal Processing, Prague, 22-27 May 2011, pp. 3580-3583.
 C. Oberli, M. C. Estela and M. Ríos, “On Using Transmission Overhead Efficiently for Channel Estimation in OFDM,” IEEE Transactions on Communications, Vol. 58, No. 2, 2010, p. 399. doi:10.1109/TCOMM.2010.02.070530
 P. Hoeher, S. Kaiser and P. Robertson, “Two-Dimensional Pilot-Symbol-Aided Channel Estimation by Wiener Filtering,” IEEE International Conference on Acoustics, Speech and Signal Processing, Munich, 21-24 April 1997, pp. 1845-1848.
 X. Wang, H. C. Wu, S. Y. Chang, Y. Wu and J. Y. Chouinard, “Analysis and Algorithm for Non-Pilot-Aided Channel Length Estimation in Wireless Communications,” IEEE Conference on Global Telecommunications, New Orleans, 30 November-4 December 2008, pp. 1-5.
 M. Karami, A. Olfat and N. C. Beaulieu, “Pilot Symbol Assisted Adaptive Modulation for OFDM Systems with Imperfect Channel State Information,” IEEE Conference on Global Telecommunications, Miami, 6-10 December 2010, pp. 1-6.