Channel Estimation in OFDM Mobile Wireless Channel Using Pilot Sequences

  ijett-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
© 2013 by IJETT Journal
Volume-4 Issue-3                       
Year of Publication : 2013
Authors : Vikas Kumar Batav , Brajlata Chourasiya


Vikas Kumar Batav , Brajlata Chourasiya. "Channel Estimation in O FDM Mobile Wireless Channel Using Pilot Sequences". International Journal of Engineering Trends and Technology (IJETT). V4(3):489-492 Mar 2013. ISSN:2231-5381. published by seventh sense research group.


Error free transmission is one of the main aims in wireless communications. With the increase in multimedia application, large amount of data is being transmitted over wireless communic ations. Due to the channel fading and the Doppler shifts caused by user mobility, a common problem in wireless systems, additional technologies are needed to combat multipath propagation fading and Doppler shifts. Time - variant channel estimation is one suc h crucial technique used to improve the performance of the modern wireless systems with Doppler spread and multipath spread. In this paper, we present the improved scheme of LS based channel estimation technique using block type pilot sequences. Channel es timation is done by estimating the time - varying channel frequency response for the OFDM symbols . The Least Square (LS) method is used for channel estimation technique using the block type pilot sequences. Time - variant channel estimation using pilot Sequenc es technique is a useful channel estimation technique in mobile wireless communication for accurately estimating transmitted information. The main advantage of pilot sequence is allowing more accurate representation of high mobility mobile wireles s channel s with low complexity. The MATLAB/SIMULINK Communication tool box is used for implement the proposed model. Due to channel interference, the accuracy of channel estimation is an essential factor for a good receiver design in order to exploit the full poten tial capacity of the OFDM systems. The main goal is to test the recently proposed method, time - variant channel estimation using pilot sequences.


[1] Jing Xue, Tao Luo, Dan Shan, and Weidong Xiang “Doppler Diversity Technique Based On Pilot - Aid ed Channel Estimation For OFDM Wireles s Mobile Communication” IEEE. Communication Technology and Application (ICCTA 2011), IET International Conference on 14 - 16 Oct. 2011.
[2] C.Venkatesh and M.Madheswaran “A Novel Scheme for Least Square based Channel Estimation in OFDM Tra nsmission System” IEEE Proceedings of International Conference 2008.
[3] Markku Pukkila Channel estimation Modeling, Nokia research center HUT 19.12.2000.
[4] Y. Li, N. Seshadri, and S. Ariyavisitak “Channel estimation for OFDM systems with transmi tter diversity in mobile wireless channels,” IEEE J. Select. Areas Commun, vol. 17, pp. 461 – 470, Mar. 1999.
[5] L. J. Cimini, Jr. B. Daneshrad, and N. R. Sollenberger, “Clustered OFDM with transmitter diversity and coding”, IEEE Global Telecommun. Conf. , pp. 703 – 707, Nov. 1996.
[6] L. J. Cimini and N. R. Sollenberger, “OFDM with diversity and coding for high - bit - rate mobile data applications,” in IEEE Global Telecommun. Conf. , Phoenix, AZ, Nov. 1997, pp. 305 – 309.
[7] Tao LUO, “Sat uration throughput analysis of networks in D oppler spread scenarios”. IET Communications, vol 4, is s.7, p p.817 - 825,2010.
[8] Israel Koffman and Vincentzio Roman Broadband Wireless Access Solutions Based on OFDM Access in IEEE 802.16, IEEE Commun. Mag., vol. 40, no. 4, April 2002, pp. 96 - 103.
[9] R. Prasad, “Introduction” in OFDM for Wi reless Communications Systems, Lon don, United Kingdom: Artech House, 2004, pp. 11 - 14.
[10] S. B. Weinstein and P. M. Ebert, “Data Transmission by Frequency - Division Multiplexing Using the Discrete Fourier Transform,” in IEEE Trans. Commun. Technol., vol. COM - 19, pp. 628 - s634, Oct. 1971.

Doppler Diversity, OFDM, Pilot Sequences, Channel Estimation, Least Square.