Frequency response measurements of the wireless indoor channel at infrared frequencies

The results of frequency response measurements at eight different rooms in a university building at infrared (IR) frequencies are reported. A major result shows that the indoor wireless optical channel is very dynamic, with great variations in the channel´s characteristics for data collected in different rooms, in different locations within the same room, and for different orientations of the optical receiver at the same location of the same room. Numerical values of the channel´s relative path loss and 3 dB bandwidth along with frequency response plots covering a wide range of conditions are presented and discussed. The analysis shows that IR is a suitable candidate for high speed wireless data communication inside buildings