Mehran University Research Journal Of Engineering &
Technology (HEC Recognized In Category "X")
Publishing Since 1982.



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New Hybrid Technique for Impulsive Noise Suppression in OFDM Systems

Keywords: Orthogonal Frequency Division Multiplexing, Impulsive Noise, Reed Solomon Codes, Adaptive Algorithm, Bit Error Rate

Mehran University Research Journal of Engineering & Technology

Volume 36 ,  Issue 3

ALINA  MIRZA,AYESHA ZEB  ,SHAHZAD AMIN SHEIKH  

Abstract

In this paper, a new hybrid technique employing RS (Reed Solomon) coding and adaptive filter for impulsive noise suppression in OFDM (Orthogonal Frequency Division Multiplexing) systems is presented. Adaptive filter creates a more accurate estimate of the original OFDM signal after impulsive noise cancellation. The residual impulsive noise is further mitigated by RS decoder in the second stage of proposed technique. Three members of adaptive filters family i.e. NLMS (Normalized Least Mean Square) algorithm, RLS (Recursive Least Square) algorithm and Bhagyashri algorithm are tested with RS decoder in the proposed hybrid technique. Furthermore, the results in terms of steady state MSE (Mean Square Error) reduction, BER (Bit Error Rate) improvement and SNR (Signal to Noise Ratio) enhancement confirm the effectiveness of the proposed dual faceted technique when compared with the recently reported techniques in literature.