 [13] Bernard Sklar, "Rayleigh Fading Channels in Mobile Digital Communication Systems. II. Mitigation.", IEEE Communications Magazine volume 35 (Issue 7) (July 1997). [14] Bernard Sklar, Digital Communications: Fundamentals and Applications, second ed. Prentice Hall, 2001. [15] Arogyaswami Paulraj, et al., Introduction to Space-Time Wireless Communications, Cambridge University Press, 2008. [16] Y. Okumura, E. Ohmori, K. Fukuda, "Field Strength and its Variability in VHF and UHF Land Mobile Radio Service.", Review of the Electrical Communication Laboratory No. 16 (September-October, 1968). M. Hata, "Empirical Formulae for Propagation Loss in Land Mobile Radio Services." IEEE Transactions on Vehicular Technology vol. VT-29 (No. 3) (1980). William. C. Jakes, Microwave Mobile Communications, John Wiley & Sons, 1974. [19] 3GPP TR 25.892, Feasibility Study for Orthogonal Frequency Division Multiplexing (OFDM) for UTRAN Enhancement, March 2004. [20] Yiyan Wu, William Y. Zou, "Orthogonal Frequency Division Multiplexing: A Multi-Carrier Modulation Scheme", IEEE Transactions on Consumer Electronics vol. 41 (No. 3) (August 1995). [21] Hu Su, et al., "Analysis of Tone Reservation Method for WiMAX System." International Symposium on Communications and Information Technologies, ISCIT'06, October 2006. Savo G. Glisic, Advanced Wireless Communications: 4G Cognitive and Cooperative Broadband Tech- nology, second ed. Wiley Inter-Science, 2007. A. Osseiran, Jiann-Ching Guey, "Hopping pilot pattern for interference mitigation in OFDM." IEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications, September 2008. Richard Nilsson, Ove Edforst, Magnus Sandellt, Per Ola Borjesson, "An Analysis of Two-Dimensional Pilot-Symbol Assisted Modulation for OFDM.", 1997 IEEE International Conference on Personal Wireless Communications Publication, December 1997. D.E. Dudgeon, R.M. Mersereau, Multidimensional Digital Signal Processing, Prentice Hall, 1984. [26] IEEE 802.16m-07/244r1, Yang Song, Liyu Cai, Keying Wu and H