K. Tsubouchi, T. Tomioka, T. Sato, C. Endo, N. Mikoshiba
{"title":"An asynchronous spread spectrum wireless-modem using a SAW convolver","authors":"K. Tsubouchi, T. Tomioka, T. Sato, C. Endo, N. Mikoshiba","doi":"10.1109/ULTSYM.1988.49370","DOIUrl":null,"url":null,"abstract":"The authors have developed a compact spread-spectrum (SS) wireless modem using a SAW (surface acoustic wave) convolver (the efficient ZnO-SiO/sub 2/-Si Sezawa wave convolver). The SS modem was based on a DS (data-scanning) method, where the PN (pseudonoise) code length was 127 bits and the code rate was 14 MHz. The demodulation method of the SS modem was a completely asynchronous one, which was very useful for application to wireless communication under the very weak signals. From 1989 in Japan, the allowed electric field of a transmitter without a license will be less than 500 mu V/m at 3 m in the frequency range less than 322 MHz. Under this restriction the usual narrowband FM modem was effective only within a distance less than 11 m. The SS modem proved to be reliable for distances as far as 110 m.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"16 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"11","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE 1988 Ultrasonics Symposium Proceedings.","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ULTSYM.1988.49370","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 11
Abstract
The authors have developed a compact spread-spectrum (SS) wireless modem using a SAW (surface acoustic wave) convolver (the efficient ZnO-SiO/sub 2/-Si Sezawa wave convolver). The SS modem was based on a DS (data-scanning) method, where the PN (pseudonoise) code length was 127 bits and the code rate was 14 MHz. The demodulation method of the SS modem was a completely asynchronous one, which was very useful for application to wireless communication under the very weak signals. From 1989 in Japan, the allowed electric field of a transmitter without a license will be less than 500 mu V/m at 3 m in the frequency range less than 322 MHz. Under this restriction the usual narrowband FM modem was effective only within a distance less than 11 m. The SS modem proved to be reliable for distances as far as 110 m.<>
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