Title

Ultra-Wideband Communication System Prototype Using Orthogonal Frequency Coded SAW Correlators

Authors

Authors

D. R. Gallagher; N. Y. Kozlovski;D. C. Malocha

Comments

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Abbreviated Journal Title

IEEE Trans. Ultrason. Ferroelectr. Freq. Control

Keywords

Acoustics; Engineering, Electrical & Electronic

Abstract

This paper presents preliminary ultra-wideband (UWB) communication system results utilizing orthogonal frequency coded SAW correlators. Orthogonal frequency coding (OFC) and pseudo-noise (PN) coding provides a means for spread-spectrum UWB. The use of OFC spectrally spreads a PN sequence beyond that of CDMA; allowing for improved correlation gain. The transceiver approach is still very similar to that of the CDMA approach, but provides greater code diversity. Use of SAW correlators eliminates many of the costly components that are typically needed in the intermediate frequency (IF) section in the transmitter and receiver, and greatly reduces the signal processing requirements. Development and results of an experimental prototype system with center frequency of 250 MHz are presented. The prototype system is configured using modular RF components and benchtop pulse generator and frequency source. The SAW correlation filters used in the test setup were designed using 7 chip frequencies within the transducer. The fractional bandwidth of approximately 29% was implemented to exceed the defined UWB specification. Discussion of the filter design and results are presented and are compared with packaged device measurements. A prototype UWB system using OFC SAW correlators is demonstrated in wired and wireless configurations. OFC-coded SAW filters are used for generation of a transmitted spread-spectrum UWB and matched filter correlated reception. Auto-correlation and cross-correlation system outputs are compared. The results demonstrate the feasibility of UWB SAW correlators for use in UWB communication transceivers.

Journal Title

Ieee Transactions on Ultrasonics Ferroelectrics and Frequency Control

Volume

60

Issue/Number

3

Publication Date

1-1-2013

Document Type

Article

Language

English

First Page

630

Last Page

636

WOS Identifier

WOS:000316216200019

ISSN

0885-3010

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