Sistemas de transmissão/recepção sem fios por raios infravermelhos

Abstract

This paper describes the results obtained in the characterisation, optimisation and test, of two wirelessinfrared communication systems. Although both systems arebased on the same technology they are used on differentapplications. On the first part of this paper an wireless optical indoorcommunication system, that uses angle diversity techniqueson the reception is presented. This optical receiver wasdeveloped in the IRWLAN project. Some practical results ofthis receiver, such as SNR measurements, BER, range andsensitivity to ambient light noise are presented. On the second part of this paper, a test and measurementsetup for the characterisation of a line-of-sight, point-topoint,outdoor optical system and its transmission channel are presented.