Suppression of impulsive noise in OFDM system using imperfect channel state information

Abstract

This paper presents the orthogonal frequency division multiplexing (OFDM) system working under Nakagami-m multipath fading channels, which utilizes the impulsive noise excision technique. Its performance is also evaluated under the imperfect channel state information (CSI) constraint. Although the impact of noise reduces due to the noise bucket effect appearing in OFDM systems with longer symbol duration, yet the impulsive noise energy spreads over OFDM subcarriers, which appears as a hazard in the demodulation and detection when the energy of impulsive noise exceeds certain threshold level. Under realistic conditions, the channel estimators cannot provide perfect/ideal channel state information. In this paper, we use the impulsive noise compensation method as a technique for the suppression of impulsive noise in the frequency-domain after OFDM demodulation and channel equalization. Under the aforementioned scenario, the simulation results are demonstrated for the performance evaluation of underlying OFDM communication system, under the Nakagami-m multipath fading channel, which also focuses on the adverse effects of imperfect CSI at the receiver, in terms of bit error rate.