"INTER-CARRIER INTERFERENCE REDUCTION IN BROADBAND WIRELESS ACCESS TECHNOLOGY USING EXTENDED KALMAN FILTER"

“INTER-CARRIER INTERFERENCE REDUCTION IN BROADBAND WIRELESS ACCESS TECHNOLOGY USING EXTENDED KALMAN FILTER”

Author		: ASRI DILIYANZAH; RINA PUDJI ASTUTI; BUDI SYIHABUDDIN
Published on	: ICoICT 2014 (Telkom Engineering School - Bandung Indonesia)

Abstract

“OFDM technology in Broadband Wireless Access has some disadvantages as well, one of them is Intercarrier Interference (ICI) which happens when there is carrier frequency offset (CFO). Moreover, high-mobility communication will suffer worse because of Doppler shift and cause CFO which impact the impairment of orthogonality among subcarrier, and of course degrades the OFDM performance. This research uses Extended Kalman Filter (EKF) as scheme of ICI reduction by deploying CFO estimation and commit correction using iteration beforehand. This method requires preamble in the beginning of frame for early estimation purpose prior to send information. This method works optimally in slow time varying channel. This paper has difference compare with other researches. This research sets CFO dynamically using stretches of CFO value in order to approach real condition. Result of research shows that OFDM using EKF scheme is better than conventional OFDM. OFDM using EKF is able to achieve Bit Error rate (BER) approximate to 10 -5 by providing Eb/No equal to 14 dB, whereas conventional OFDM could only achieve an equal BER by providing Eb/No equal to 16 dB. It means OFDM using EKF is able to correct 2 dB of system gain for each 10 5 generated bit by conventional OFDM. Besides, EKF scheme also results a reliable performance in different mappers.”