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

Zabih Ghassemlooy, Andrew Hayes, Brett Wilson

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)
3 Downloads (Pure)

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.
Original languageEnglish
Pages (from-to)445-452
JournalIEE Proceedings: Optoelectronics
Volume150
Issue number5
DOIs
Publication statusPublished - Oct 2003

Fingerprint

Dive into the research topics of 'Reducing the effects of intersymbol interference in diffuse DPIM optical wireless systems'. Together they form a unique fingerprint.

Cite this