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A robust ultra-broad-band wireless communication system using SAW chirped delay lines

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8 Author(s)
Springer, A. ; Inst. for Commun. & Inf. Eng., Linz Univ., Austria ; Huemer, M. ; Reindl, L. ; Ruppel, C.C.W.
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Design and performance of a low-cost wireless communication system for indoor and industrial environments are presented. The system is based on chirp-signal transmission to achieve a robust communication link. For the chirp expansion and compression, surface acoustic wave chirped delay lines fabricated from LiTaO3-X112rotY are used. Center frequency, bandwidth, and chirp rate are 348.8 MHz, 80 MHz, and ±40 MHz/μs, respectively. An optimized square-root weighting was chosen to reduce the sidelobes of the compressed pulse to -42 dB compared to the correlation peak. The chirp filters have been deployed in a hardware demonstrator for data rates of up to 5 Mb/s. Limiting factors for the data rate according to simulations and measurements are mainly intersymbol interferences due to the time overlapping of consecutive symbols and, to a lower extent, the multipath propagation

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:46 ,  Issue: 12 )

Date of Publication:

Dec 1998

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