An improved algorithm for channel estimations of OFDM system based pilot signal


H. Alnuaimy, Ahmed N. and Jumari, Kasmiran and El-Saleh, Ayman A. and Ali, A. M. and Ismail, Mahamod (2009) An improved algorithm for channel estimations of OFDM system based pilot signal. World Academy of Science, Engineering and Technology (WASET), 26 (11). pp. 61-63. ISSN 2010-376X

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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.

Item Type: Article
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Suzilawati Abu Samah
Date Deposited: 06 Feb 2014 03:45
Last Modified: 06 Feb 2014 03:45


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