Low Insertion Loss Surface Acoustic Wave Matched Filter with Low Sidelobe Sequence and Its Application for Spread Spectrum Communication

For direct sequence (DS) spread spectrum communication systems with differential phase-shift keying (DPSK) modulation, we have calculated low autocorrelation sidelobe pseudo noise (PN) sequences. We constructed a matched filter comprising localized layered structure on a quartz crystal to obtain low...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 35; no. 5S; p. 3024
Main Authors Shiba, Takashi, Yuhara, Akitsuna, Moteki, Minoru, Ota, Yasuhiro, Tamizu, Kazuhide, Okajima, Daini, Oda, Kouji, Tsubouchi, Kazuo
Format Journal Article
LanguageEnglish
Published 01.05.1996
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Summary:For direct sequence (DS) spread spectrum communication systems with differential phase-shift keying (DPSK) modulation, we have calculated low autocorrelation sidelobe pseudo noise (PN) sequences. We constructed a matched filter comprising localized layered structure on a quartz crystal to obtain low matching loss. As a result of the sequences and the construction, 14 dB (6 dB improvement on that of the conventional sequences) peak vs sidelobe of correlated output signal and 9 dB lower loss than that of a conventional filter was achieved. We have applied these matched filters to SS rf-modem units for weak-power digital communications. In these modem units high data rate (1 Mbps), long communication distance (about 20 m) and low current (210 mA when received) performances are obtained.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.35.3024