title: BPSK & QPSK modulated data communication for biomedical monitoring sensor network.
abstract: Data communication between body-mounted sensors is progressing towards wireless monitoring networks. In this work, digital data communication by galvanic coupling through the body is presented as a promising approach for wireless intra-body communication. The human body itself serves as the transmission medium of electrical current. Both binary and quadrature phase-shift-keying (BPSK and QPSK) modulated data transmissions are implemented and compared for galvanic coupled links between 2 differential electrode pairs. The adaptive system offers up to 1 mA maximum current amplitude between 10 kHz and 1MHz. Data communication at a rate of up to 64 kbit/s was realized with BER of 10(-4) corresponding to an SNR greater than 6 dB. The novel technology has shown its feasibility in clinical trials. Furthermore, such a low-current approach enables data communication that is more energy-saving than other wireless technologies.
authors.affiliation: Integrated Syst. Lab., Swiss Fed. Inst. of Technol., Zurich, Switzerland. mwegmuel@iis.ee.ethz.ch
authors.forename: Marc S
authors.initials: MS
authors.lastname: Wegmueller
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Fichtner
authors.forename: Michael
authors.initials: M
authors.lastname: Oberle
authors.forename: Niels
authors.initials: N
authors.lastname: Kuster
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation*; D003195:Computer Communication Networks / Q000295:instrumentation*; D003936:Diagnosis, Computer-Assisted / Q000295:instrumentation* / Q000379:methods; D004566:Electrodes; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D018670:Monitoring, Ambulatory / Q000295:instrumentation* / Q000379:methods; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013686:Telemetry / Q000295:instrumentation* / Q000379:methods