In-body to off-body channel modelling

Recently, implanted devices have provided a promising area in medical telemetry. To make a reliable communication link between an implanted device and a base station, knowledge about wave propagation is necessary. Although there are some formulas for the path loss from in-body to off-body devices, there is no statistical model for this channel. In this paper, a ray tracing method is applied to model a cardiac implant in-body to off-body channel in an indoor area. The frequency is 403 MHz, which is allocated for medical implant communication services (MICS). Simulation results show that the electric field probability distribution function is almost log-logistic. Because of ray tracing accuracy limitations at this frequency for indoor areas, the error of this method is also calculated. The error estimation results show that in most of the cases (more than 90%) the relative error is less than 100%.

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