An Improved Algorithm for Channel Estimations of OFDM System based Pilot Signal
This paper presents a new algorithm for the channel estimation of the OFDM system based on a pilot signal for the new generation of high data rate communication systems. In orthogonal frequency division multiplexing (OFDM) systems over fast-varying fading channels, channel estimation and tracking is generally carried out by transmitting known pilot symbols in given positions of the frequency-time grid. In this paper, we propose to derive an improved algorithm based on the calculation of the mean and the variance of the adjacent pilot signals for a specific distribution of the pilot signals in the OFDM frequency-time grid then calculating of the entire unknown channel coefficients from the equation of the mean and the variance. Simulation results shows that the performance of the OFDM system increase as the length of the channel increase where the accuracy of the estimated channel will be increased using this low complexity algorithm, also the number of the pilot signal needed to be inserted in the OFDM signal will be reduced which lead to increase in the throughput of the signal over the OFDM system in compared with other type of the distribution such as Comb type and Block type channel estimation.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1334648Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1104
 Slock, "Signal Processing challenges for wireless Communication," in Proc, 1st Int. Sym. on Control, Communications and Signal Processing, Tunisia, pp. 881-892, March 21-24 2004.
 R. Nilsson, O. Edfors, M. Sandell and P. O. Brjesson,"An analysis of two-dimensional pilot-symbol assisted modulation for OFDM," in Proc. IEEE ICPWC-97, 1997, pp. 71-74.
 J.-J. van de Beek, O. Edfors, M. Sandell, S.K. Wilson, and P. O. Borjesson, "On channel estimation in OFDM systems," The 45th IEEE VTC, PP. 815-819, July 1995.
 S. Coleri, M. Ergen, and A. Bahai, "Channel estimation techniques based on pilot arrangement in OFDM systems," IEEE Trans. Broadcast., vol. 48, pp. 223-229, Sept. 2002.
 E. Biglieri, J. Proakis, and S. Shamai, "Fading channels: Information theoretic and communications aspects," IEEE Trans. Inform. Theory, vol. 44, pp. 2619-2692, Oct. 1998.