Dual Amplitude-Width PPM for Free Space Optical Systems

Full Text (PDF, 117KB), PP.45-50

Views: 0 Downloads: 0

Author(s)

Mehdi Rouissat 1,* Riad .A Borsali 1 Mohammed Chick-Bled 1

1. Laboratory of Telecommunications Of Tlemcen (LTT) Dept Electronic, Faculty of thechnology Abou Bekr Belkaid University, PB 119 Tlemcen, Algeria

* Corresponding author.

DOI: https://doi.org/10.5815/ijitcs.2012.03.07

Received: 10 May 2011 / Revised: 24 Aug. 2011 / Accepted: 8 Oct. 2011 / Published: 8 Apr. 2012

Index Terms

PPM, PAM, PWM, DAWPPM, data rate, power requirements and bandwidth efficiency

Abstract

The PPM (Pulse Position Modulation) is commonly used in Free Space Optic (FSO) systems owing to its power efficiency, but it shows a rapid decline in spectral efficiency with increase in the power efficiency and moderate data rate. In order to improve these two parameters, we present a modified modulation scheme of the existing PPM, on the basis of PPM, PAM (Pulse Amplitude Modulation) and PWM (Pulse Width Modulation). This modified version called DAWPPM (Dual Amplitude-Width PPM).
The average power requirements, bandwidth efficiency and normalized data rate are studied after introducing symbol structure. The proposed scheme shows an improvement in terms of data rate and bandwidth efficiency, and when in come to power efficiency it shows lower efficiency compared to PPM. We present theoretical expressions of data rate, spectral efficiency, and normalized power requirements, and we present comparison results to PPM modulation scheme.

Cite This Paper

Mehdi Rouissat, Riad A. Borsali, Mohammed Chick-Bled, "Dual Amplitude-Width PPM for Free Space Optical Systems", International Journal of Information Technology and Computer Science(IJITCS), vol.4, no.3, pp.45-50, 2012. DOI:10.5815/ijitcs.2012.03.07

Reference

[1]H. Hemmati. Deep Space Optical Communications in Deep space communications and navigation series Canifornia [B]: Wiley-Interscience, 2006.

[2]X. Zhu and J. Kahn, Free-space optical communication through atmospheric turbulence channels [A], IEEE Trans. on Communications, no. 2, pp. 1293–1300,2003.

[3]Sabi S. and Vijayakumar N. Simulation of a Modem using Digital Pulse Interval Modulation for Wireless Optical Links [A]. 10th National Conference on Technological Trends (NCTT09) 6-7 Nov 2009.

[4]M.Ijaz, O. Adebanjo, S. Ansari, Z. Ghassemlooy, S. Rajbhandari, H. Le Minh, A. Gholami and E. Leitgeb. Experimental Investigation of the Performance of OOK-NRZ and RZ Modulation Techniques under Controlled Turbulence Channel in FSO Systems [A]. IEEE Trans. 2010.

[5]S. J. Dolinar, J. Hamkins, B. E. Moision, and V. A. Vilnrotter. Optical modulation and coding in Deep Space Optical Communications [M]. Edition. Wiley-Interscience. 2006.

[6]H. Park and J.R. Barry. Modulation Analysis for Wireless Infrared Communications [A]. presented at IEEE International Conference on Communications, ICC 95, Seattle, pp. 1182-1186,1995.

[7]Yu Zeng, Roger Green, and Mark Leeson,. Multiple Pulse Amplitude and Position Modulation for the Optical Wireless Channel [A]. IEEE Transl 2008.

[8]Yangyu Fan and Roger J. Green. Comparison of pulse position modulation and pulse width modulation for application in optical communications [J]. Optical Engineering 46 6, 065001. June 2007.