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All Journal International Journal of Electrical and Computer Engineering International Journal of Informatics and Communication Technology (IJ-ICT)
M.F.L Abdullah
University Tun Hussein Onn
Computer Science & IT Electrical & Electronics Engineering

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Multilevel Signal Analyzer Tool for Optical Communication System M.F.L Abdullah; Rahmat Talib
International Journal of Electrical and Computer Engineering (IJECE) Vol 2, No 4: August 2012
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (339.961 KB)

Abstract

This paper presents an educational software interface tool to analyze multilevel signal at the receiver of an optical communication system. This tool provides visualization in terms of eye-diagram and bit/symbol error rate along the symbol duration using Gaussian approximation method. Besides that, maximum Q-factors, minimum BER and corresponding threshold level are also displayed. This tool is developed using Matlab as an interface programming tool. The developed analyzer has been used to analyze 2, 4 and 8-PAM signal for an optical communication system. A commercial software known as OptiSystem™ has been used to develop and simulate the multilevel optical system. The performance of the develop analyzer has been validated with the build in analyzer of OptiSystem.DOI:http://dx.doi.org/10.11591/ijece.v2i4.1464
Reduction Techniques of Peak-to-Average Power Ratio in MC-CDMA Systems Mayada Faris Ghanim; M.F.L Abdullah
International Journal of Informatics and Communication Technology (IJ-ICT) Vol 1, No 2: December 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

The high peak-to-average power ratio (PAPR) is one of the main disadvantages of multicarrier code division multiple access (MC-CDMA) system. To reduce the PAPR of multicarrier CDMA signals, a lot of studies have been focused on the power characteristics of spreading sequences. This paper presents the main techniques to reduce the PAPR in MC-CDMA like Amplitude Clipping and Filtering, Coding, Selective Mapping, The adaptive predistortion technique and DFT Spreading. Then a comparison of all these techniques is done in order to clarify the main advantages and disadvantages of each technique.DOI: http://dx.doi.org/10.11591/ij-ict.v1i2.558
Co-Authors Mayada Faris Ghanim Rahmat Talib