Open AccessAdvanced pilot design procedure based on HS algorithm for OFDM‐IDMA system
Author(s) -
Şimşir Şakir,
Taşpinar Necmi
Publication year - 2018
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2017.1365
Subject(s) - orthogonal frequency division multiplexing , algorithm , computer science , estimator , mean squared error , channel (broadcasting) , upper and lower bounds , cramér–rao bound , mathematical optimization , mathematics , estimation theory , telecommunications , statistics , mathematical analysis
The direct effect of the pilot positions to the channel estimation performance gives an opportunity for minimising the estimation errors in multicarrier transmission technologies. To this end, harmony search (HS) algorithm is proposed for optimising the pilot distribution pattern in order to increase the performance of least squares estimator employed in orthogonal frequency division multiplexing‐interleave division multiple access (OFDM‐IDMA) system. Besides, the upper bound of mean square error (MSE) utilised as the fitness function of HS algorithm is obtained by using Gershgorin disc theorem to get rid of matrix inversion process required in MSE calculation. In the simulations, the authors’ proposed HS‐based pilot optimisation technique proves to be an effective way of pilot design for OFDM‐IDMA system by providing a clear performance superiority over the other considered pilot placement strategies.