Patent ID: 8340158

Claim:
A transmitter using a limited passband for a human body communication system, comprising: a transmission frame generating means for human body communication which generates a transmission frame for human body communication based on data information including user identification (ID) and data scrambled into an orthogonal code generated by the user ID; a symbol mapping means for symbolizing the generated transmission frame for human body communication according to a predetermined modulating method; a spreading means for spreading the symbol outputted in the symbol mapping means; a waveform generating means for generating a baseband signal whose band is limited to a predetermined range with respect to the data spread in the spreading means; and a middle band transmitting means for modulating the baseband signal into a predetermined limited passband signal within a predetermined range while maintaining a waveguide characteristic, and wherein the modulate and limited passband signal is transmitted within the predetermined frequency range except the predetermined frequency range having a highest affect of interference from other electronic devices.