An asynchronous spread spectrum wireless-modem using a SAW convolver

IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI:10.1109/ULTSYM.1988.49370

K. Tsubouchi, T. Tomioka, T. Sato, C. Endo, N. Mikoshiba

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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一种使用SAW卷积器的异步扩频无线调制解调器

作者开发了一种紧凑的扩频(SS)无线调制解调器，使用SAW(表面声波)卷积器(高效的ZnO-SiO/sub 2/-Si Sezawa波卷积器)。SS调制解调器基于DS(数据扫描)方法，其中PN(伪噪声)码长为127位，码率为14 MHz。SS调制解调器的解调方式为完全异步解调方式，非常适合应用于信号非常微弱的无线通信中。在日本，从1989年开始，在322 MHz以内的频率范围内，无证发射机允许的电场在3 m处小于500 μ V/m。在这种限制下，通常的窄带调频调制解调器仅在距离小于11米的范围内有效。SS调制解调器被证明在110米的距离内是可靠的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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IEEE 1988 Ultrasonics Symposium Proceedings.

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