An efficient technique based on firefly algorithm for pilot design process in OFDM-IDMA systems

Authors : Necmi TAŞPINAR, Şakir ŞİMŞİR

Pages : 817-829

View : 15 | Download : 9

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Accurate placement of pilot tones has been a crucial task in multicarrier transmission technologies since there is a strong relation between pilot positions and channel estimation performance. Therefore, the firefly algorithm insert ignore into journalissuearticles values(FA); is proposed for achieving the optimal pilot distribution by optimizing the pilot positions in order to minimize the estimation errors of the least squares algorithm employed in orthogonal frequency division multiplexing-interleave division multiple access insert ignore into journalissuearticles values(OFDM-IDMA); systems. According to the simulation results, our proposed FA-based pilot optimizer provides a great performance increase in OFDM-IDMA systems by obtaining the most appropriate pilot distribution pattern among the considered pilot placement strategies. The upper bound of mean square error insert ignore into journalissuearticles values(MSE); is used as the fitness function in the optimization process for avoiding the matrix inversion operation that is needed when calculating MSE itself.
Keywords : OFDM IDMA, pilot tones design, channel estimation, firefly algorithm