50-Mbs diffuse infrared free-space link using on-off keying with decision-feedback equalization

Author

Marsh, G.W. ; Kahn, J.M.

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., California Univ., Berkeley, CA, USA

Volume

1

fYear

1994

fDate

31 Oct-2 Nov 1994

Firstpage

74

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-cm² 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^-7 BER

Keywords

band-pass filters; error statistics; intersymbol interference; mobile communication; optical filters; optical modulation; optical receivers; optical transmitters; p-i-n photodiodes; 2.9 m; 475 mW; 50 Mbit/s; 805 nm; BER; Si; ambient natural lighting; artificial lighting; average power; bandwidth; bright skylight; decision-feedback equalization; decision-feedback equalizer; diffuse infrared free-space link; eye-safe transmitter; high-index hemispherical concentrator; indoor wireless communication; low bit-error rates; multipath ISI; multipath distortion; on-off keying; optical bandpass filter; receiver; shadowing; silicon p-i-n photodiode; system performance; Bit error rate; Optical coupling; Optical distortion; Optical fiber communication; Optical receivers; Optical transmitters; PIN photodiodes; Shadow mapping; Silicon; Wireless communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Signals, Systems and Computers, 1994. 1994 Conference Record of the Twenty-Eighth Asilomar Conference on

Conference_Location

Pacific Grove, CA

ISSN

1058-6393

Print_ISBN

0-8186-6405-3

Type

conf

DOI

10.1109/ACSSC.1994.471420

Filename

471420