Intersystem interference model for frequency hopping systems

In this paper a method for calculating the impact of intersystem interference between frequency hopping systems is proposed. The results are given in form of the average bit error probability over all frequencies used by the system. The method includes both the transmitter spectrum with sidebands and the receiver selectivity with sidebands. Furthermore, the effects from partially overlapping frequency hopping bands are included in the model. A strength of the model is that it can be generalized to an arbitrary number of interfering frequency hopping systems. Moreover, in addition to frequency hopping systems, interference on a fix frequency from different kinds of systems can also be included. If measured interference spectra, for example from a computer or a background, are available they can be incorporated in the calculations as well. Results from using the model show that it is important to use correct models of both the transmitter spectrum and receiver sidebands. If the effects from transmitter sidebands and/or receiver selectivity is neglected the resulting bit error probability can be severely underestimated.