Throughput Enhancement in OFDM System using Low Overhead Pilot Insertion Scheme over Slow Fading Rayleigh Channel

Orthogonal Frequency Division Multiplexing (OFDM) is a widespread adopted technique for wireless and wired communication systems because of its inherent feature of the spectral efficiency and robustness to channel impairments. The throughput deterioration of the OFDM system due to pilots can be reduced by minimizing the density of pilots. A Modified Minimum Mean Square Error (M-MMSE) estimator with low computational complexity based on Low overhead Pilot Insertion (LPI) scheme is also proposed. The pilot overhead in the LPI scheme is reduced compared to blocktype channel estimation. The comparative analysis of the MMMSE estimator for the LPI scheme with MMSE estimator for block-type pilot arrangement shows significant performance improvement of the proposed channel estimation algorithm.

[1]  Jean Armstrong.  Tutorial on optical OFDM , 2012, ICTON 2012.

[2]  L. U. Khan,et al.  Robust modified MMSE estimator for comb-type channel estimation in OFDM systems , 2013, 2013 15th International Conference on Advanced Communications Technology (ICACT).

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

[4]  Himanshu Sharma,et al.  Channel Estimation in OFDM Systems , 2013 .

[5]  Hao Li,et al.  Pilot-Aided Channel Estimation Techniques in OFDM System , 2009, 2009 International Conference on Communication Software and Networks.

[6]  Zemin Liu,et al.  A Decision-Aided Residual ISI Cancellation Algorithm for OFDM Systems , 2006, 2006 8th international Conference on Signal Processing.

[7]  Umberto Mengali,et al.  A comparison of pilot-aided channel estimation methods for OFDM systems , 2001, IEEE Trans. Signal Process..

[8]  Meng-Han Hsieh,et al.  Channel estimation for OFDM systems based on comb-type pilot arrangement in frequency selective fading channels , 1998 .

[9]  Haseeb Zafar,et al.  A novel channel estimation error minimizing interpolation technique for OFDM systems , 2014, 2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP).

[10]  Zhenming Peng,et al.  A Novel OFDM Interpolation Algorithm Based on Comb-Type Pilot , 2009, 2009 5th International Conference on Wireless Communications, Networking and Mobile Computing.

[11]  Hui Liu,et al.  OFDM-Based Broadband Wireless Networks – Design and Optimization , 2005 .