A Joint ICI Mitigation Method Based on Decision Feedback and Pilot Tracking

Abstract:

Orthogonality among subcarriers of OFDM is destroyed by Doppler spread in high mobility environment, causing the decline of system performance. Based on the analyses of ICI principle, a low complexity ICI mitigation method is proposed by equalization in frequency domain. The method is characterized by joint channel estimation of decision feedback and pilot tracking with weighted correction, using estimation result of long training sequence as the initial value. System performance under conditions of different SNR and normalized Doppler shift was tested and compared using new method and conventional methods. Simulations show that the SER performance of our proposed method is satisfactory.

• Periodical: Advanced Materials Research (Volumes 301-303)
• Pages: 682-687
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.301-303.682
• Online since: July 2011
• Authors: Yong Mao Cheng, Ping Yun Zhu, Li Li Pan, Wang Da Chen
• Keywords: Decision Feedback, Doppler Shift, Inter-Carrier Interference, Orthogonal Frequency Division Multiplexing (OFDM), Pilot

References

[1] Y Li, G Stuber: Orthogonal Frequency-Division Multiplexing for Wireless Communications, Springer Press, New York, USA (2006), pp.8-28.

[2] M. Russell, G. Stuber: Interchannel interference analysis of OFDM in a mobile environment. Proc. IEEE Vehicular Technology Conf. (1995), pp.820-824.

DOI: 10.1109/vetec.1995.504982

[3] P. Robertson, S. Kaiser: The effects of Doppler spreads in OFDM(A) mobile radio systems. Proc. IEEE Vehicular Technology Conf. (1999), pp.329-333.

DOI: 10.1109/vetecf.1999.797150

[4] Y. Li, L. Cimini: Bounds on the inter-channel interference of OFDM in time-varying impairments. IEEE Trans. Commun., Vol. 49 (2001), pp.401-404.

DOI: 10.1109/26.911445

[5] Taewon Hwang, Chenyang Yang and Geoffrey Ye Li: OFDM and Its Wireless Applications: A Survey. IEEE Trans. Veh. Technol., Vol. 58, No. 4(2009), pp.1673-1694.

DOI: 10.1109/tvt.2008.2004555

[6] Y S Choi, P J Voltz and F A Cassara: On channel estimation and detection for multicarrier signals in fast and selective Rayleigh fading channels. IEEE Trans. Commun., Vol. 49, No. 8(2001) , pp.1375-1387.

DOI: 10.1109/26.939860

[7] Y. Mostofi, D. C. Cox: ICI mitigation for pilot-aided OFDM mobile systems. IEEE Trans. Commun., Vol. 4, No. 2(2005), pp.765-774.

DOI: 10.1109/twc.2004.840235

[8] Baxley R. J, Kleider, J. E and Zhou G. T: Pilot Design for IEEE 802. 16 OFDM and OFDMA. IEEE International Conference on Acoustics, Speech and Signal processing, (2007), pp.321-324.

DOI: 10.1109/icassp.2007.366237

[9] Y. Mostofi, D. C. Cox: Robust and efficient intercarrier interference mitigation for OFDM systems in time-varying fading channels. IEEE Trans. Veh. Technol., Vol. 56, No. 5(2007), pp.2517-2528.

DOI: 10.1109/tvt.2007.899974

[10] Hui Chen, Xiaoguang Chen: Channel estimation for time varying channel based on decisiondirected technique in OFDM mobile systems. Journal on Communications. Vol. 28, No. 11 (2005), pp.1-5.

[11] LIU Xiao-ming, LI Dan and ZHANG Xu-ying: Training guided decision feedback equalization method for OFDM System. Journal of System Simulation. Vol. 20, No. 8 (2008), p.2007-(2010).

[12] Li, D., Feng, S. and Ye, W.: Uneven pilot-assisted channel estimation method for mobile OFDM systems. 11th IEEE Singapore International Conference on Digital Object Identifier (2008) , pp.1076-1080.

DOI: 10.1109/iccs.2008.4737348

[13] Lok Tiing Tie, Yan Wu and Kar Peo Yar: Performance Evaluation of Mesh-based Mobile WiMax PHY Baseband for Above the Sea Propagation. 2010 European Wireless Conference (2010), pp.83-87.

DOI: 10.1109/ew.2010.5483398

[14] Jeon W G, Chang K H and Cho Y S: An Equalization Technique for Orthogonal Frequency-division Multiplexing Systems in Time-variant Multipath Channels. IEEE Trans on Communications. Vol. 47, No. 1 (2008), pp.27-32.

DOI: 10.1109/26.747810