Indoor optical wireless systems–a review |
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Authors: | Street A M Stavrinou P N O'brien D C Edwards D J |
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Institution: | (1) Department of Engineering Science, University of Oxford, UK |
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Abstract: | This paper reviews the research effort to date into optical wireless communication systems, both in academic and industrial
contexts. The idea of using the optical medium for wireless communications is not new, having been proposed as a means for
indoor communications almost two decades ago. However, the last few years have seen an explosive interest in the potential
for free space optical systems to provide portable data communications. One of the prime motivators for reconsidering the
use of an optical carrier in the wireless context is the demand for greater transmission bandwidths. The radio frequency spectrum
is already exceedingly congested and frequency allocations of sufficient bandwidths are extremely hard to obtain. Further,
for the high bandwidth services envisaged, the use of microwave or mm-wave systems will be required, where device technology
is currently either expensive or immature. Proponents of optical wireless systems argue that the optical medium is the only
cost-effective way to provide high bit-rate mobile services to volume markets. This paper identifies the technical obstacles
and limitations of indoor optical wireless delivery in addition to techniques for mitigating these effects and shows that
infrared is a viable alternative to radio for certain applications.
This revised version was published online in November 2006 with corrections to the Cover Date. |
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