Industrial Equipment Radio Frequency Noise Measurements and Models for Indoor Wireless Communications at 918 MHz , 2 . 44 GHz , and , 4 . 0 GHz

Development of radio-frequency communications equipment for wireless indoor networks is an active field. A thorough understanding of the channel characteristics is needed to develop reliable system design guidelines and installation techniques for future indoor wirel~ss systems. These systems will be used for reconfigurable voice, data, and video networks that link portable computers, vision systems, cash registers, and telephones in stores, offices, and factories [1]. Researchers have given considerable attention to the investigation and modeling of indoor radio wave propagation in recent years [1-4]. However, it appears that little scientific work has been done to determine the significance of indoor radio-frequency (RF) noise and its impact on system performance. Noise models for indoor channels and specific noise sources are important for determining irreducible error