体导电信道分析与研究

为了降低植入器件的功耗和有效控制植入器件，提高通信效率，提出了一种基于体导电的低功耗数字通信模型。当体导电流的工作频率在kHz级，生物背景信号干扰是微不足道的，体导电信道可近似为加性高斯白噪声信道。从香农信息论出发，推导出二维凋制下的信道容量公式，从而得到推论：在极低信噪比时采用两电平调制就能相当有效地利用信道容量，在高信噪比时，为了充分利用信道容量必须采用多电平调制。利用SystemView对信道进行仿真，证明体导电数字通信的可行性，并得出采取调制方式的必要性，以及误码率和信噪比的关系。

Analysis and Research of Volume Conduction Channel

In order to reduce the power consumption of devices implanted and control the devices effectively,a low power digital communication model based volume conduction is presented in this paper.As the frequency increases approaching tens of kHz,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,two-dimensional modulation of channel capacity formula is derived,based ...