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Proceedings of 1994 28th Asilomar Conference on Signals, Systems and Computers (1994)
Pacific Grove, CA, USA
Oct. 31, 1994 to Nov. 2, 1994
ISSN: 1058-6393
ISBN: 0-8186-6405-3
pp: 74-77
G.W. Marsh , Dept. of Electr. Eng. & Comput. Sci., California Univ., Berkeley, CA, USA
J.M. Kahn , Dept. of Electr. Eng. & Comput. Sci., California Univ., Berkeley, CA, USA
ABSTRACT
We report an experimental 50-Mb/s free-space infrared link for indoor wireless communication, which achieves low bit-error rates (BERs) in the presence of multipath distortion, shadowing, and ambient natural and artificial lighting. The eye-safe 805-nm transmitter, directed at the ceiling, emits an on-off-keyed signal having 475-mW average power. The receiver employs a 1-cm/sup 2/ silicon p-i-n photodiode coupled to a high-index hemispherical concentrator; which is covered by an optical bandpass filter of 30-nm bandwidth. A decision-feedback equalizer mitigates the effect of multipath ISI. In the presence of bright skylight, the link achieves a range of 2.9 mn at 10/sup -7/ BER.<>
INDEX TERMS
optical receivers, optical transmitters, mobile communication, error statistics, p-i-n photodiodes, optical filters, band-pass filters, intersymbol interference, optical modulation
CITATION

G. Marsh and J. Kahn, "50-Mbs diffuse infrared free-space link using on-off keying with decision-feedback equalization," Proceedings of 1994 28th Asilomar Conference on Signals, Systems and Computers(ACSSC), Pacific Grove, CA, USA, 1995, pp. 74-77.
doi:10.1109/ACSSC.1994.471420
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