Modeling Radiated Disturbances from Information Technology Equipment for Interference Analysis on Digital Communication Services

Man-made disturbance sources in the vicinity of digital communication systems can vary a lot in the time domain properties of the disturbance waveforms. The performance of a digital communication receiver is strongly affected by the waveform (time-domain properties), not only the level, of the disturbance signal. Therefore, useful models of radiated disturbance must be available for system design purposes. No useful model for this purpose of the radiated disturbance from Information Technology Equipment (ITE) has been published in the literature. Existing models are mostly concerned with man made noise with a shot nature, e.g. impulse noise. These models assume disturbance pulses with stochastic amplitude, duration and arrival time. In this paper we show that the disturbance from ITE do not exhibit these properties which is why a special model for this disturbance is suggested and validated by measurements.