Title :
Synthesis of SAW-correlator with integrated spectrum-shaping
Author :
Schelbert, Peter
Author_Institution :
Inst. for Field Theory & High Frequency Tech., ETH, Zurich, Switzerland
Abstract :
A synthesis procedure for SAW (surface acoustic wave) correlators that minimizes the undesired time sidelobes and allows simultaneous spectrum shaping has been developed. The design is based on binary-phase-shift-keying (BPSK)-modulated pseudorandom digital codes, which usually are used for direct sequence spread spectrum. To design the structure of the IDTs (interdigital transducers), a straightforward deconvolution technique is used. A 70-MHz correlator with the 13-b Barker code and a 100-MHz correlator with a 103-b code have been tested. The 70-MHz correlator achieved a time sidelobe ratio of 31 dB and the 100-MHz correlator a ratio of 29.9 dB. These correlators have been developed for a real-time multipath measuring system for mobile radio
Keywords :
correlators; mobile radio systems; phase shift keying; spread spectrum communication; surface acoustic wave devices; 100 MHz; 70 MHz; BPSK modulated pseudorandom digital codes; Barker code; IDT; SAW correlator synthesis; deconvolution technique; direct sequence spread spectrum; integrated spectrum-shaping; interdigital transducers; mobile radio; real-time multipath measuring system; surface acoustic wave correlators; time sidelobe ratio; Band pass filters; Baseband; Convolution; Correlators; Land mobile radio; Matched filters; Propagation delay; Signal synthesis; Time measurement; Transducers;
Conference_Titel :
Ultrasonics Symposium, 1989. Proceedings., IEEE 1989
Conference_Location :
Montreal, Que.
DOI :
10.1109/ULTSYM.1989.66992
