A joint error correction and ICI cancellation algorithm for OFDM systems

Orthogonal Frequency Division Multiplexing (OFDM) is a spectrally efficient and robust digital communication technique adopted by the newly developed Wireless Communication standards. Frequency offset errors due to Doppler shifts disturbs the alignment of the orthogonal subcarriers and causes them to overlap with each other which results in Inter Carrier Interference (ICI). This paper proposes the use of channel estimation for ICI cancellation. The channel frequency response at pilot subcarriers is estimated by using Least Square (LS) estimator. Along with this the (23, 12, 7) Golay Code has been employed in order to further improve the Bit Error Rate (BER) performance of the system. Simulation of the proposed OFDM system is carried out for Stanford University Interim (SUI) Channel model 6 in the existence of Additive White Gaussian Noise (AWGN).

[1]  Rashid Saleem,et al.  Channel Estimation Based in Comb-Type Pilots Arrangement for OFDM System over Time Varying Channel , 2010, J. Networks.

[2]  Optimization of LSE and LMMSE Channel Estimation Algorithms based on CIR Samples and Channel Taps , 2011 .

[3]  Sven-Gustav Häggman,et al.  Intercarrier interference self-cancellation scheme for OFDM mobile communication systems , 2001, IEEE Trans. Commun..

[4]  Alireza Seyedi,et al.  General self-cancellation scheme for mitigation of ICI in OFDM systems , 2004, 2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577).

[5]  Sinem Coleri Ergen,et al.  Channel estimation techniques based on pilot arrangement in OFDM systems , 2002, IEEE Trans. Broadcast..

[6]  R. Morelos-Zaragoza.  The art of error correcting coding , 2002 .

[7]  Mark A. Wickert,et al.  Channel Estimation and Mitigation Techniques for OFDM in a Doppler Spread Channel , 2008, IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference.

[8]  Yong Soo Cho,et al.  An equalization technique for orthogonal frequency-division multiplexing systems in time-variant multipath channels , 1999, IEEE Trans. Commun..

[9]  Ramjee Prasad,et al.  OFDM for Wireless Communications Systems , 2004 .

[10]  Donald C. Cox,et al.  ICI mitigation for mobile OFDM receivers , 2003, IEEE International Conference on Communications, 2003. ICC '03..

[11]  Georgios B. Giannakis,et al.  Optimal training and redundant precoding for block transmissions with application to wireless OFDM , 2002, 2001 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.01CH37221).

[12]  Geoffrey Ye Li,et al.  Robust channel estimation for OFDM systems with rapid dispersive fading channels , 1998, ICC '98. 1998 IEEE International Conference on Communications. Conference Record. Affiliated with SUPERCOMM'98 (Cat. No.98CH36220).

[13]  Gordon J R Povey,et al.  Polynomial cancellation coding of OFDM to reduce intercarrier interference due to Doppler spread , 1998, IEEE GLOBECOM 1998 (Cat. NO. 98CH36250).

[14]  Florence Danilo-Lemoine,et al.  A Postfix Synchronization Method for OFDM and MIMO-OFDM Systems , 2008, 2008 IEEE Wireless Communications and Networking Conference.

[15]  T.K. Truong,et al.  A weight method of decoding the (23, 12, 7) Golay code using reduced table lookup , 2008, 2008 International Conference on Communications, Circuits and Systems.