CDMA for wireless SAW sensor applications

Author

Ostermayer, G. ; Pohl, A. ; Hausleitner, C. ; Reindl, L. ; Seifert, F.

Author_Institution

Appl. Electron. Lab., Univ. of Technol., Vienna, Austria

Volume

2

fYear

1996

fDate

22-25 Sep 1996

Firstpage

795

Abstract

A well known spread spectrum technique is used to get the sensor information from an individually addressed SAW sensor. Coded ID tag type and BPSK type SAW sensors are picked out of a number of sensors by correlating the received signal with the known code of a particular sensor. The ID-tag type and BPSK-coded SAW sensor´s function is observed as a scaling of time and shape respectively. The time scaling factor is equal to the mechanical extension of the substrate of a sensor due to temperature, etc. This scaling factor is evaluated by use of correlative signal processing techniques. The principal concept, mathematical simulations, numerical estimations and finally an overview of the implemented SAW sensor system are shown. Preliminary results for readout of OOK and BPSK coded passive remote SAW sensors using the wavelet transform processed within a SAW convolver are presented

Keywords

code division multiple access; correlation methods; phase shift keying; signal processing; spread spectrum communication; surface acoustic wave convolution; surface acoustic wave sensors; wavelet transforms; BPSK coded passive remote SAW sensors; CDMA; OOK coded passive remote SAW sensors; SAW convolver; coded ID tag; correlative signal processing; mathematical simulations; numerical estimations; received signal correlation; sensor information; shape scaling; spread spectrum technique; temperature; time scaling factor; wavelet transform; wireless SAW sensor applications; Binary phase shift keying; Mechanical sensors; Multiaccess communication; Numerical simulation; Shape; Signal processing; Spread spectrum communication; Surface acoustic waves; Temperature sensors; Wireless sensor networks;

fLanguage

English

Publisher

ieee

Conference_Titel

Spread Spectrum Techniques and Applications Proceedings, 1996., IEEE 4th International Symposium on

Conference_Location

Mainz

Print_ISBN

0-7803-3567-8

Type

conf

DOI

10.1109/ISSSTA.1996.563233

Filename

563233