Abstract
The emergence of portable terminals is expected to accelerate the introduction of wireless Local Area Networks (LANs). Portable devices require low power consumption, small size and weight. The demand for inexpensive, high-speed links satisfying these requirements has motivated the research on infrared (IR) wireless communications. Indoor wireless optical links can be implemented in different configurations1. High data rates IR systems with directed line-of-sight (LOS) configurations have been reported24. Directed LOS, however, is not suitable for portable terminals, alignment is crucial and full mobility cannot be achieved. A proper choice for portable communications is a non-directed configuration non-LOS, often referred to as a diffuse configuration. Gfeller and Bapst5 have pioneered the wireless IR communications via diffuse radiation. This configuration has also been realized and investigated by other research groups68. The system is tolerant to shadowing and no alignment requirements are imposed on the transceivers. The IR wireless transmission relies on the scattering properties of the surrounding surfaces, i.e., walls and ceiling, which act as distributed optical sources. In the near IR, most of the materials have a reflectivity of 40 to 90%. To achieve an approximately constant received signal power over the entire office space, the IR source radiation has to be distributed on the diffusely reflecting surfaces as homogeneous as possible. Light-emitting diodes produce diffuse radiation, however, a laser diode is required for a wider modulation bandwidth and to meet the power budget at high data rates. The receiver detects attenuated signals after multiple reflections from the ceiling and the walls.
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsPreview
Unable to display preview. Download preview PDF.
References
M. Pakravan, Broadband indoor wireless communications using infrared, Univ. of Ottawa, Dept. of Elect. Eng., M.Sc. thesis, August (1994).
D. Johnson, D. Cowan, Free space local area network (FIRLAN), SPIE 32: 2114 (1993).
M. McCullagh, I. Neild, D. Wisely, A IGb/s optical wireless LAN supporting mobile transceivers, Wireless ’94: 468, Calgary Canada, July (1994).
T. Chu, M. Gans, High speed infrared local wireless communication, IEEE Comm. Magazines 25: 4–10 (1987).
F. Gfeller and U. Bapst, Wireless in-house data communication via diffuse infrared radiation, Proc. of IEEE 67: 1474 (1979).
J. Barry, Wireless communication using non-directed infrered light, Ph. D. dissertation, University of California at Berkley, Dec. (1992).
G. Marsh, J. M. Kahn, 50-Mb/s diffuse infrared free-space link using on-off keying with decision-feedback equalization, IEEE Phot. Techn. Lett. 6: 596 (1994).
M. Pakravan, M. Kavehrad, Design considerations for broadband indoor infrared wireless communications systems, Int. J. of Wireless Inf. Networks 2: 223 (1995).
P. Smyth, M. McCullage, D. Wisely, S. Ritchie, P. Eardley and Cassidy, Optical wireless local area networks-enabling technologies, B. T. Teehnol. J. 11: 100 (1993).
E. Simova, M. Kavehrad, Holographic stars, Appl. Opt. 34: 6350 (1995).
M. Kavehrad, E. Simova, M. Pakravan, and M. Tai, Broadband indoor wireless communications with infrared, CASCON, Toronto, Nov. (1995).
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1997 Springer Science+Business Media New York
About this chapter
Cite this chapter
Simova, E., Tai, M., Kavehrad, M. (1997). Indoor Wireless Infrared Link with a Holographic Multiple-Spot Diffuser. In: Lampropoulos, G.A., Lessard, R.A. (eds) Applications of Photonic Technology 2. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9250-8_37
Download citation
DOI: https://doi.org/10.1007/978-1-4757-9250-8_37
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4757-9252-2
Online ISBN: 978-1-4757-9250-8
eBook Packages: Springer Book Archive