Indoor optical wireless systems employing dual header pulse interval modulation (DH-PIM)

Aldibbiat, Nawras, Ghassemlooy, Zabih and McLaughlin, R. (2005) Indoor optical wireless systems employing dual header pulse interval modulation (DH-PIM). International Journal of Communication Systems, 18 (3). pp. 285-305. ISSN 1074-5351

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Official URL: http://dx.doi.org/10.1002/dac.704

Abstract

This paper assesses the performance of dual header pulse interval modulation (DH-PIM) over indoor optical wireless systems. DH-PIM being anisochronous scheme offers a built-in symbol synchronization capability. Theoretical and simulation results demonstrate that DH-PIM offers shorter symbol length, improved transmission rate and bandwidth requirement and a comparable power spectral density profile compared with digital pulse interval modulation (DPIM) and pulse position modulation (PPM) schemes.

It is shown that DH-PIM2, with wider pulse duration is the preferred option when the available channel bandwidth is limited and higher optical power is tolerable. Whereas DH-PIM1, with narrower pulse width, exhibits comparable power requirements but a marginally higher bandwidth compared with DPIM, and is also more bandwidth efficient than PPM at the cost of increased power requirement. However, at higher bit resolutions, i.e. M⩾7, DH-PIM1 is both bandwidth and power efficient compared with PPM. Error rate analysis show that DH-PIM offers improved packet error rate compared with on-off-keying (OOK) and DPIM, but marginally inferior as compared with PPM. The power requirement and penalty due to intersymbol interference for non-dispersive and dispersive channels is analysed and the results show that for given parameters, DH-PIM requires marginally higher optical power compared with PPM and DPIM, but it supports the same bit rate at much less bandwidth requirement.

Item Type: Article
Uncontrolled Keywords: optical wireless communications, pulse interval modulation, packet error rate, optical power requirement, bandwidth requirement, multipath dispersion
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 24 Apr 2014 15:45
Last Modified: 10 Aug 2015 11:35
URI: http://nrl.northumbria.ac.uk/id/eprint/16131

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