Abstract—Impulsive noise is one of the commonly affecting noise in Orthogonal Frequency Division Multiplexing (OFDM) systems. Methods have been implemented for the reduction of this noise in literature previously. Also, in communication systems, hybrid methods have been implemented for impulsive noise removal. In this paper, an adaptive filter based technique comprised of Normalized Least Mean Square (NLMS) and Recursive Least Square (RLS) algorithms along with clipping method is implemented as a solution for impulsive noise cancellation in OFDM system. The scheme is tested on random binary data modulated over different types of constellation schemes. The impulsive noise cancellation in OFDM system was appreciable using the hybrid technique after demodulation at the receiver for different modulation schemes namely 8-PSK, 16 QAM and 32 QAM. The convergence characteristics are demonstrated by the simulation results comparing their Bit Error Rates (BER) under same parameters which shows the effectiveness of the implemented hybrid method in OFDM.

 

Index Terms—impulsive noise, OFDM, clipping, adaptive filter, BER

Cite: Alina Mirza, Sumrin Mehak Kabir, and Shahzad Amin Sheikh, "Reduction of Impulsive Noise in OFDM Systems Using a Hybrid Method," International Journal of Signal Processing Systems, Vol. 4, No. 3, pp. 226-230, June 2016. doi: 10.18178/ijsps.4.3.226-230