Communication channel analysis and simulation of medical implanted electronic devices based on the volume conduction

The research of the communication between medical implanted electronic devices (hereinafter referred to as implanted devices) and external devices is a focus. In this paper, a data communications model based Volume Conduction is presented. As the frequency increases the KHz level, the effect of background biological noise is considered negligible, the channel is thus modeled as the additive white Gaussian noise (AWGN) channel in these frequencies. From Shannon information theory, in two-dimensional modulation, the volume conduction channel capacity formula was derived, further derivation: with extremely low signal to noise ratio (SNR) using in the two-level modulation can be very effective use of channel capacity, with high SNR a multi-level modulation is used in order to make full use of the channel capacity. System-view software is used to the channel simulation, the input and output signal waveforms and eye diagram comparison, the curves of the BER (bit error rate) and SNR.