Journal
ETRI JOURNAL
Volume 34, Issue 2, Pages 216-225Publisher
WILEY
DOI: 10.4218/etrij.12.0111.0178
Keywords
Human body communication (HBC); touch-and-play (TAP); analog front end; frequency selective digital transmission; Walsh code
Funding
- Ministry of Knowledge Economy (MKE), Rep. of Korea [100-385-99]
- Converging Research Center
- Ministry of Education, Science and Technology [2011K000662]
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This paper presents a transceiver module for human body communications whereby a spread signal with a group of 64 Walsh codes is directly transferred through a human body at a chip rate of 32 Mcps. Frequency selective digital transmission moves the signal spectrum over 5 MHz without continuous frequency modulation and increases the immunity to induced interference by the processing gain. A simple receiver structure with no additional analog circuitry for the transmitter has been developed and has a sensitivity of 250 mu V-pp. The high sensitivity of the receiver makes it possible to communicate between mobile devices using a human body as the transmission medium. It enables half-duplex communication of 2 Mbps within an operating range of up to 170 cm between the ultra-mobile PCs held between fingertips of each hand with a packet error rate of lower than 10(-6). The transceiver module consumes 59 mA with a 3.3 V power supply.
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