Green, Roger, Joshi, Harita, Higgins, Matthew D. and Leeson, Mark S. (2008) Recent developments in indoor optical wireless systems. IET Communications, Vol.2 (No.1). pp. 3-10. doi:10.1049/iet-com:20060475

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Abstract

An overview of the developments in optical wireless systems viewed from the traditional communications viewpoint of transmitter, channel and receiver is presented. The trends in modulation formats that match information to the optical wireless channel are considered. This is followed by the discussion of recent transmitter and receiver innovations, particularly the utilisation of diversity transceivers. As a preliminary to the following treatment, the nature and modelling of the optical wireless channel are introduced, with particular emphasis on its unique features in terms of transmitted power constraints and non-negativity. From the examination of modulation formats, on-off-keying remains the format of choice for basic binary transmission, whereas pulse-position modulation and its derivatives are preferred for more sophisticated requirements. The recent introduction of techniques from radio systems employing subcarriers is seen to be the most promising development in modulation techniques at present. In receiver technology, quasi-diffuse systems employing multispot diffusion and angular diversity are significant developments. They offer lower path loss and less multipath dispersion, at a lower transmission power compared to 'conventional' wide-angle diffuse systems, while providing a high level of user mobility compared to line-of-sight transmission. These developments are helping optical wireless systems to fulfil their promise by adopting a philosophy inspired by the radio domain to accommodate operation within a hostile channel.

Item Type:	Journal Article
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	Faculty of Science > Engineering
Library of Congress Subject Headings (LCSH):	Wireless communication systems, Optical communications
Journal or Publication Title:	IET Communications
Publisher:	The Institution of Engineering and Technology
ISSN:	1751-8628
Official Date:	January 2008
Dates:	Date Event January 2008 Published
Volume:	Vol.2
Number:	No.1
Number of Pages:	8
Page Range:	pp. 3-10
DOI:	10.1049/iet-com:20060475
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access

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