Transmitter, receiver and method thereof in human body communication system

A receiver in a human communication system, comprising:

• a plurality of receiving electrodes receiving a transmission frame including a plurality of control frames and a plurality of data frames;
• first and second switches connected with the plurality of receiving electrodes;
• a switching control unit controlling a switching of the first and second switches so as to selectively connect the plurality of receiving electrodes with the first and second switches in response to each control frame according to a predetermined rule when each of the plurality of control frames is input;
• a signal processing unit performing a signal processing on the transmission frame output from the first and second switches;
• a preamble detection unit detecting a first preamble from each of the plurality of control frames included in the signal-processed transmission frame to generate a preamble correlation value for the first preamble;
• and
• a correlation value processing unit controlling the switching control unit so as to select a pair of final receiving electrodes among the plurality of receiving electrodes based on the preamble correlation value,
• wherein the preamble correlation value represents a degree of correlation between a value of the first preamble and a value of a predetermined reference preamble and is obtained by performing a bitwise comparison on each bit of the value of the first preamble and a corresponding bit of the value of the predetermined reference preamble.

A method for transmitting data used for a human body communication system, comprising:

• generating image frames including image data regarding an obtained image;
• generating a transmission frame including the image frames;
• and
• transmitting the transmission frame through transmitting electrodes;
• wherein the transmission frame includes a plurality of control frames used for selecting pairs of receiving electrodes in a receiver and a plurality of data frames including the image frames;
• wherein each of the plurality of control frames includes:
• a first preamble used to synchronize the frames and select the receiving electrodes;
• a first header differentiating frame types;
• frame information including information on the image frames;
• and
• a switching time section for providing time required for electrode switching in the receiver, and
• each of the plurality of data frames includes:
• a second preamble synchronizing the frames;
• a second header differentiating the frame types;
• and
• at least a portion of the image frames, and
• wherein the generating of the transmission frame includes:
• modulating the image frame according to a preset modulation scheme;
• generating the first and second preambles;
• generating the first and second headers;
• generating the frame information;
• and
• multiplexing the modulated image frame, the first and second preambles, the first and second headers, and the frame information and the switching time section to generate the transmission frame.

A method for receiving data used in a human body communication system, comprising:

• receiving a transmission frame including a plurality of control frames and a plurality of data frames through a plurality of receiving electrodes;
• controlling, by a switching control unit, a switching of first and second switches so as to selectively connect the plurality of receiving electrodes with the first and second switches in response to each control frame according to a predetermined rule when each of the plurality of control frames is input;
• performing, by a signal processing unit, a signal processing on the transmission frame output from the first and second switches;
• detecting, by a preamble detection unit, a first preamble from each of the plurality of control frames included in the signal-processed transmission frame to generate a preamble correlation value for the first preamble;
• and
• controlling, by a correlation value processing unit, the switching control unit to select a pair of final receiving electrodes among the plurality of receiving electrodes based on the preamble correlation value,
• wherein the preamble correlation value represents a degree of correlation between a value of the first preamble and a value of a predetermined reference preamble and is obtained by performing a bitwise comparison on each bit of the value of the first preamble and a corresponding bit of the value of the predetermined reference preamble.