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A 4Mbps INFRARED WIRELESS COMMUNICATION SYSTEM DEDICATED TO MOBILE COMPUTING
Uno, Hiroshi,kumatani, Keiji,Okuhata, Hiroyuki,shirakawa, Isao,Chiba, Toru 대한전자공학회 1996 APCCAS:Asia Pacific Conference on Circuits And Sys Vol.1 No.1
A high performance and low power architecture is devised for a 4Mbps infrared wireless communication system dedicated to the mobile computing. In this architecture, 4PPM(4-Pulse Position Modulation) infrared signals detected by an infrared receiver are digitized into TTL interface level pulses, and the digitized pulses are demodulated by a 1-bit digital demodulator. To improve the dynamic range of the link length, a 4PPM demodulator is synthesized to implement a demodulation algorithm which is constructed so as to accommodate the output tolerance of the infrared receiver. A part of experimental results shows that the realized 4Mbps infrared communication system can achieve an error free link in the range of 0-140cm at 90mW power consumption.