Open Access

ARTICLE

New Preamble Sequence for WiMAX System with Improved Synchronization Accuracy

by Suma Sekhar^1,*, Sakuntala S. Pillai², S. Santhosh Kumar³

1 Department of Electronics and Communication Engineering, LBS Institute of Technology for Women, Thiruvananthapuram, Kerala, India
2 Mar Baselios College of Engineering and Technology, Thiruvananthapuram, Kerala, India
3 Department of Electronics and Communication, Govt. Engineering College, Idukki, Kerala, India

* Corresponding Author: Suma Sekhar. Email:

Intelligent Automation & Soft Computing 2023, 35(3), 3187-3197. https://doi.org/10.32604/iasc.2023.028702

Received 16 February 2022; Accepted 25 April 2022; Issue published 17 August 2022

Abstract

Worldwide Interoperability for Microwave Access (WiMAX) trusts Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM) combination for the deployment of physical layer functions and for connecting the medium access control to the wireless media. Even though Orthogonal Frequency Division Multiplexing (OFDM) facilitates reliable digital broadband transmission in the fading wireless channels, the presence of synchronization errors in the form of Carrier Frequency Offset (CFO) and Time Offset (TO) adversely affect the performance of OFDM based physical layers. The objective of this work is to improve the accuracy of the frequency and the time offset estimation in the WiMAX physical layer. A method to enhance the synchronization accuracy by fine-tuning the merit factor of the preamble sequence is suggested in this paper. Also, a new preamble with improved synchronization accuracy is proposed for the WiMAX system. The performance of the proposed preamble is evaluated in a Rayleigh fading channel and the results of simulations show that the Mean Square Error (MSE) in offset estimation is significantly reduced and it outperforms the standard WiMAX preamble.

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Keywords

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