Optimizing the performance of digital pulse interval modulation with guard slots for diffuse indoor optical wireless links

Rajbhandari, Sujan, Ghassemlooy, Zabih and Angelova, Maia (2011) Optimizing the performance of digital pulse interval modulation with guard slots for diffuse indoor optical wireless links. IET Microwave Antennas & Propagation, 5 (9). pp. 1025-1030. ISSN 1751-8725

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Abstract

The performance of indoor optical wireless communication (OWC) systems degrades as the channel becomes dispersive and achieving higher data rates is problematic. In this study, different decoding algorithms are suggested to improve the performance of the digital pulse interval modulation (DPIM) scheme with guard slot(s) without incorporating an equalizer at the receiver. The normalized optical power requirement (NOPR) to achieve a slot error rate (SER) of 10-6 is calculated for a comparative study of different systems. A threshold decoding scheme with the optimum threshold level offers a significant reduction in NOPR compared to a fixed threshold level of 0.5. The hybrid approach in which a slot is detected by comparing received signal with a threshold level as well as amplitude of adjacent slots has potential to improve the performance. Moreover, with the decoding scheme adopted, which maximises the likelihood of a pulse within a symbol, there is marked improvement in the system performance.

Item Type:	Article
Additional Information:	Selected papers from Mosharaka International Conference on Communications, Propagation and Electronics (MIC-CPE2010).
Uncontrolled Keywords:	intersymbol interference, ISI, diffuse indoor optical wireless communication channel, DPIM, GS, hybrid decoding scheme
Subjects:	H600 Electronic and Electrical Engineering
Department:	Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User:	EPrint Services
Date Deposited:	11 May 2010 15:35
Last Modified:	12 Oct 2019 19:07
URI:	http://nrl.northumbria.ac.uk/id/eprint/3436

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