We developed the indirect load control assistant system which supports DSM (Demand Side Management). This system controls general home electric appliances such as air conditioners and luminary apparatus through the power line carrier. On the proof examination of the system, we found the phenomenon that the communication between the system and the equipment was obstructed by the influence of other general home appliances. Therefore we have investigated the cause and solution to improve reliability of communication. In this paper, we report property of general electrical home appliances which effects home communication environment and the meadsures to improve the reliability of communication through the power line carrier and EMC issue related to the power line carrier.
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