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IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. 17, NO. 4, APRIL 1999 725 Code-Division Multiplexing of a Sensor
 

Summary: IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. 17, NO. 4, APRIL 1999 725
Code-Division Multiplexing of a Sensor
Channel: A Software Implementation
Joshua R. Smith, Christopher Salthouse, and Neil Gershenfeld, Member, IEEE
Abstract--This paper demonstrates the use of software radio
techniques in the context of sensing, rather than communications.
It describes code-division multiplexing (CDMA) and time-division
multiplexing (TDMA) of a receiver channel in an electric field
sensing system. The only hardware used is a front-end gain
stage consisting of two opamps and a microcontroller. The mod-
ulation and demodulation operations are implemented entirely
in the microcontroller software. Multiple coded waveforms are
transmitted simultaneously, and induce a combined signal on
a single receive electrode. The combined signal, after passing
through a single analog front end terminating in an analog-to-
digital converter, is separated into the four original component
signals by a software demodulation operation.
The signal-to-noise ratio (SNR) achieved by the code-division
multiplexed system given a fixed measurement time is compared
to the SNR achieved by a time-division multiplexed implemen-

  

Source: Anderson, Richard - Department of Computer Science and Engineering, University of Washington at Seattle

 

Collections: Computer Technologies and Information Sciences