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

Authors

NECMİ TAŞPINAR
ŞAKİR ŞİMŞİR

DOI

10.3906/elk-1707-187

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 (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 (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 (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

First Page

817

Last Page

829

Recommended Citation

TAŞPINAR, NECMİ and ŞİMŞİR, ŞAKİR (2018) "An efficient technique based on firefly algorithm for pilot design process in OFDM-IDMA systems," Turkish Journal of Electrical Engineering and Computer Sciences: Vol. 26: No. 2, Article 16. https://doi.org/10.3906/elk-1707-187
Available at: https://journals.tubitak.gov.tr/elektrik/vol26/iss2/16