Some Recent Advances in Indoor Broadband Infrared Wireless Communications

摘要

Multi-spot diffusing configuration (MSDC) is one of the most promising candidates for high-speed in-house wireless communications using infrared (IR) light For mis presentation, channel characteristic in MSDC has been simulated and the causes for channel distortion are discussed. Conditions for creation of a virtually ideal channel are presented. It is shown that the 3dB-channel bandwidth can be extended to beyond 2GHz. Ample bandwidth availability comes at the cost of a poor power efficiency. In order to compensate for that, power efficient signaling schemes such as pulse-position modulation (PPM) can be employed. It is shown that an average bit-error rate (BER) not exceeding 10~(-9) can be achieved within the link coverage area with more than 99% probability, at bit rates up to a few hundreds of megabits per second, using transmitted power levels well below one Watt For practical implementation of a MSD communication system, a novel transmitter and receiver optical subsystems design is presented.