Title :
50-Mb/s 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
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 Si 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 m at 10-7 BER
Keywords :
amplitude shift keying; decision feedback equalisers; digital communication; intersymbol interference; optical communication; optical receivers; optical transmitters; 2.9 m; 475 mW; 50 Mbit/s; 805 nm; BER; Si; ambient natural lighting; artificial lighting; bright skylight; decision-feedback equalization; free-space infrared link; high-index hemispherical concentrator; indoor wireless communication; low bit-error rate; multipath ISI; multipath distortion; on-off keying; optical bandpass filter; p-i-n photodiode; receiver; shadowing; transmitter; Bit error rate; Optical coupling; Optical distortion; Optical fiber communication; Optical receivers; Optical transmitters; PIN photodiodes; Shadow mapping; Stimulated emission; Wireless communication;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 1994. Wireless Networks - Catching the Mobile Future., 5th IEEE International Symposium on
Conference_Location :
The Hague
Print_ISBN :
90-5199-193-2
DOI :
10.1109/WNCMF.1994.529422
