In this paper, the regulatory radiation level emanated from the low-power radio devices has been predicted. Prom a radio interference point of view, the personal communication services (PCS) receiver is chosen as a victim wireless device. And the low-power radio devices is offender ones. This paper primarily focuses on the intermodulation interference by unmodulated signal in adjacent channel. A theoretical analysis has been proposed using the well-known intermodulation interference theory. That method of analysis includes amplitude of interference corresponding signal-to-interference ratio (SIR) and transformation process of the electric field strength. The calculated electric field strength level becomes the quantified upper limit to avoid the intermodulation interference on the victim device, and it was 76.26 dBμ.V/m. To show the validity on the suggested value, the simulation was conducted by the Advanced Design System (ADS) tool for the commercial PCS receiver model. The resultant numerals show a good match between two values within less than 5%. In addition, we discussed the relation between our conclusion and the Federal Communication Commission (FCC) regulation of the low-power radio device. The outcomes of the paper may be applicable to any other wireless devices with nonlinear characteristics in many ways.
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