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Wireless in-house data communication via diffuse infrared radiation

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2 Author(s)
Gfeller, F.R. ; IBM Zurich Research Laboratory, Rüschlikon, Switzerland ; Bapst, U.

A novel wireless broadcast/multi-access channel is described for flexibly interconnecting a cluster of data terminals located within the same room. The transmission medium is diffusively scattered infrared radiation at 950-nm wavelength. Transmission is low-to-medium speed and the range up to 50 m. Theoretical analysis indicates that the time dispersion limits the transmission bandwidth of the system to 260 Mbit ċ m/s, but background noise produced by ambient daylight reduces the transmission speed below 1 Mbit/s. The transmission properties of the diffuse optical channel are analyzed, and experimental digital links for baseband PCM at 125 kbit/s and PSK 64 kbit/s are demonstrated.

Published in:

Proceedings of the IEEE  (Volume:67 ,  Issue: 11 )