中文摘要：

针对植入器件闭环通信系统设计和实现中面临的通信难题，提出了一种基于体导电的数据通信模型；分析了体导电信道的基本特征，即体导电信道工作频率在千赫兹级时，生物背景信号干扰微不足道，体导电信道可近似为加性高斯白噪声信道（additive white gaussion noise，AWGN）；推导出了二维调制下的信道容量公式；并得出：在极低信噪比时采用两电平调制就能有效地利用信道容量，在高信噪比时，可采用多电平调制。利用System View对信道进行仿真，仿真结果表明体导电数据通信的可行性，证实了两电平调制在体导电通信系统中优越于多电平调制，得出了信道误码率与信噪比之间的关系。

英文摘要：

According to closed-loop communication system design of implantable devices and the communication problems, a data communication model based on volume conduction is proposed; volume conduction channel＇ s basic characteristic is analyzed, namely, when working frequency of volume conduction channel runs in kHz grade, biological background signal interference is insignificant, volume conduction channel can he approximated as additive white gaussian noise channel （AWGN） ; derived under two-dimensional modulation channel capacity formula. Thus, two-level modulation of channel capacity could be effective at very low signal to noise ratio （SNR）, while multi-level modulation should be used at high SNR. Finally, using SystemView of channel simulation, the results show that the two-level modulation is better than multi-level modulation and verify the effectiveness of the proposed method.