Reducing the effects of intersymbol interference in diffuse DPIM optical wireless systems

Ghassemlooy, Zabih, Hayes, Andrew and Wilson, Brett (2003) Reducing the effects of intersymbol interference in diffuse DPIM optical wireless systems. IEE Proceedings: Optoelectronics, 150 (5). pp. 445-452. ISSN 1350-2433

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Ghassemlooy Z, Hayes AR, Wilson B - Reducing the effects of intersymbol interference in diffuse DPIM optical wireless systems - article.pdf - Accepted Version

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Official URL: http://dx.doi.org/10.1049/ip-opt:20030744

Abstract

The paper investigates the performance of digital pulse interval modulation (DPIM) in the presence of multipath propagation and additive white Gaussian noise. To combat intersymbol interference (ISI), guard slots and a nonlinear equaliser have been introduced. The average optical power requirements (AOPR) due to ISI for cases with/without guard slots and with equaliser are analysed using a ceilingbounce model. Results obtained show that in the absence of equalisation, DPIM without guard slot offers a lower AOPR compared with on–off keying (OOK). Introducing guard slots gives a further reduction in AOPR by up to 4 dB due to the reduced duty cycle of the DPIM signal. The performance of DPIM without guard slot but using an equaliser is found to be significantly better than DPIM with guard slots on a channel with severe ISI.

Item Type: Article
Additional Information: Published in the Special issue of the IET Proceeding in Optoelectronics by invitation. A paper with theoretical significance in investigating the effects of artificial light affect on optical wireless systems. Research results directly relevant to wireless communications industries. A PhD research (AR Hayes) funded by the University Studentship, completed in 2002 A collaborative work with Communications Eng. Research group, UMIST. One of the highest impact journals in Electrical and Electronics Engineering.
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Physics and Electrical Engineering
Depositing User: EPrint Services
Date Deposited: 20 Nov 2008 15:01
Last Modified: 09 May 2017 13:10
URI: http://nrl.northumbria.ac.uk/id/eprint/2846

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