University Park, Pa. --- Penn State engineers have shown that broadband, wireless, indoor, local area communication networks that rely on non-line-of-sight infrared (IR) signal transmission can offer low error rates as well as safe, low – below one Watt – power levels. Dr. Mohsen Kavehrad, professor of electrical engineering and holder of the W. L. Weiss (AMERITECH) chair, says, "Line-of-sight or point-to-point infrared signal transmission, which is used, for example, in television remote controls, is highly efficient at low power levels but suffers from the need for alignment between the transmitter and receiver. If someone ‘shadows' or blocks the remote control beam while you're trying to change the channel, the signal can't get through.
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