WCSE 2016
ISBN: 978-981-11-0008-6 DOI: 10.18178/wcse.2016.06.036

Time-varying Channel Estimation for OFDM Systems in the Vehicular Environment

Jiang Peng, Zhinian Luo, Bin Liu

Abstract— The impacts of vehicular environments on the orthogonal frequency division multiplexing (OFDM) system are investigated, and the effects on channel estimation are studied in this paper. An improved channel estimation scheme is proposed in order to estimate time-varying channels correctly in the vehicular communications such as 802.11p. First time-varying channel is approximated by a generalized complex-exponential basis expansion model (GCE-BEM), and then time-varying channel gain matrix is estimated initially by the training sequence in the preamble and updated iteratively by the data symbols according to the correlation characteristic of the channel response (CR) between the adjacent two data symbols. Basis expansion model (BEM) coefficients are estimated by least square (LS) method. The computer simulations show that the proposed scheme has better bit error rate (BER) and spectrum efficiency performance than the traditional methods.

Index Terms— OFDM system, time-varying channel estimation, BEM.

Jiang Peng, Zhinian Luo, Bin Liu
College of Computer Science and Electronic Engineering, Hunan University, CHINA


Cite: Jiang Peng, Zhinian Luo, Bin Liu, "Time-varying Channel Estimation for OFDM Systems in the Vehicular Environment," Proceedings of 2016 6th International Workshop on Computer Science and Engineering, pp. 228-235, Tokyo, 17-19 June, 2016.