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Review of Information Engineering and Applications

December 2016, Volume 3, 2, pp 11-21

OFDM Channel Estimation Based on Novel Local Search Particle Swarm Optimization Algorithm

Ali Kareem Nahar


Mohammed Moanes Ezzaldean


Sabah A. Gitaffa


Hussain K. Khleaf

Ali Kareem Nahar 1 ,

Mohammed Moanes Ezzaldean 1 Sabah A. Gitaffa 1 Hussain K. Khleaf 1 
  1. University of Technology, Department of Electrical Engineering, Baghdad, Iraq 1

Pages: 11-21

DOI: 10.18488/journal.79.2016.32.11.21

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Article History:

Received: 27 January, 2017
Revised: 23 February, 2017
Accepted: 21 March, 2017
Published: 18 April, 2017


A novel Channel Estimation (CE) approach in multi-carrier wireless communication systems, such as Orthogonal Frequency Division Multiplexing (OFDM) system and Code Division Multiple access (CDMA) via a combination of Local Search (LS) and Particle Swarm Optimization (PSO) algorithm is proposed in this study. The CE is vital towards overcoming the effect of channel fading, which causes the degradation of the Bit Error Rate (BER) and the jamming of pilot symbols. The CE expressions were derived as an objective function to study the effect of improving BER in MC-CDMA/OFDM for a frequency selective Rayleigh fading environment. The number of particles for each single swarm was used to determine the best fitness solution, and is being computed from an average BER value. The proposed channel estimator was tested under the fast fading channel in a multi carrier communication system with and without interpolation methods. The simulation showed that the proposed CE of the MIMO-OFDM system can significantly result in better BER performance compared with other techniques at different modulation types, mean square error (MSE), Signal-to-Noise Ratio (SNR) values, and channel lengths.

Contribution/ Originality
This study originates new formula for modify local search and particle swarm optimization algorithm LS-PSO.





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This study received no specific financial support.

Competing Interests:

The authors declare that they have no competing interests.


All authors contributed equally to the conception and design of the study.

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