Magnetic induction communication system for on-line electric vehicle and demodulation apparatus and demodulation method of magnetic induction communication system

A magnetic induction communication system for an on-line electric vehicle according to the present invention comprises: a first digital signal processing section that performs digital signal processing on packet data which is generated in response to a magnetic induction communication protocol; a digital analog conversion section that converts a digital signal, which is processed by the digital signal processing section, into an analog signal; a first filtering section that eliminates a high frequency component from the analog signal which is obtained by the conversion of the digital analog conversion section; a first amplification section that amplifies the analog signal which is filtered by the first filtering section; a magnetic field transmission antenna section that generates a magnetic field on the basis of the analog signal which is amplified by the first amplification section. According to the invention, by using a magnetic induction communication technology capable of wireless communication even in underground and underwater circumstances of earth, water, a metal, and the like, in order to control electric power, that is, in order to control power transmission situation, power transmission efficiency, and wireless energy transmission, the following effects are exhibited: data on a condition of the electric vehicle is transmitted to the power transmission system which is buried under a road, or power transmission situation data is transmitted from the power transmission system to the electric vehicle which is moving, whereby it is possible to optimally control a charging situation.