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DEVELOPMENT OF HIGHLY-RELIABLE SPREAD-SPECTRUM WIRELESS MODEM

高可靠扩频无线调制解调器的开发

基本信息

批准号：
02402034
负责人：
TSUBOUCHI Kazuo
金额：
$ 11.46万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02402034/
关键词：
Spread spectrum wireless communication wireless modem surface acoustic wave SAW convolver SAW correlator aluminum nitride RF IC スペクトル拡散コンボルバースペクトラム拡散通信ワイヤレスモデム AIN コンボルバ-微弱電波 AlN

项目摘要

The demand for wireless LAN for office automation, factory automation, security control system, computer communication, telecontrol, etc. has continued to increase. Spread spectrum (SS) communication system is the most promising for the wireless LAN, because of its excellent performance known as multiple access, anti-jamming, low probability of intercept, security and anti-detecting. Since the transmission bandwidth of a message in the SS system is spread far in excess of the information bandwidth using a fast PN code, S/N recovery so called process gain can be obtained. Spreading the spectrum causes the difficulty in correlating and synchronizing the PN codes between transmitter and a receiver. Using SAW (Surface Acoustic Wave) devices such as a convolver or correlator, the SS system can be implemented simply and compactly because the synchronization and correlation can be carried out asynchronously.The purpose of this work is (1) to develop a new compact asynchronous SS modems using … More a highly efficient SAW convolver, which has been developed by one of the investigators, and (2) to develop a fundamental one-chip demodulator on the basis ofAlN/Al_2O_3 combination.2.4 GHz band has been recently approved for SS communication in Japan as well as in USA.In this work, in order to improve the performance of the asynchronous SS modem using the SAW convolver, we have proposed, designed and evaluated (1) a DBM demodulation method, (2) a time window detection method, and (3) a base band error correction method. On the basis of these results, we have designed and implemented 2.4GHz full-duplex asynchronous SS modem using the SAW convolver. We progress toward the new SS modems for telecontrol, wireless digital voice communication and wireless handy terminals, etc.We have successfully deposited on epitaxial AlN films on 2-in.-diam. alpha-Al_2O_3 substrate by MOCVD.AlN features the high SAW velocity (5910m/s), moderate mechanical coupling coefficient (1%) and zero-temperature-coefficient-of-delay characteristics. The SAW correlator and SAW delay line on a AlN/alpha-Al_2O_3 substrate were designed and fabricated. We have demonstrated direct detection of 2.4GHz SS signal to base band data.The SS wireless modem using the SAW convolver and correlator has a great potential for wireless LAN. Less

办公自动化、工厂自动化、安全控制系统、计算机通信、远程控制等对无线局域网的需求不断增加。扩频通信系统以其多址接入、抗干扰、低截获、保密性和抗检测性等优良性能成为无线局域网中最有前途的通信方式。由于在SS系统中消息的传输带宽被扩展到远远超过使用快速PN码的信息带宽，所以可以获得S/N恢复，即所谓的处理增益。扩频导致在发射机和接收机之间的PN码的相关和同步的困难。利用声表面波（SAW）器件，如卷积器或相关器，由于同步和相关可以异步进行，所以可以简单而紧凑地实现扩频系统.本工作的目的是：（1）研制一种新的紧凑型异步扩频调制解调器，它采用 ...更多信息一个高效的SAW卷积器，它已经由一个研究者开发;（2）开发一个基本的单片解调器的基础上AlN/Al_2O_3组合。2.4 GHz频段最近已被批准用于SS通信在日本和美国。在这项工作中，为了提高性能的异步SS调制解调器使用SAW卷积器，我们提出了，设计并评估了（1）DBM解调方法，（2）时间窗检测方法，和（3）基带纠错方法。在此基础上，我们设计并实现了一种基于声表面波卷积器的2.4GHz全双工异步扩频调制解调器。我们的研究方向是用于遥控、无线数字语音通信和无线手持终端等的新型SS调制解调器。直径AlN具有较高的声表面波速度（5910 m/s）、适中的机械耦合系数（1%）和零温度延迟系数特性。设计并制作了以AlN/α-Al_2 O_3为衬底的声表面波相关器和声表面波延迟线。我们已经实现了2.4GHz扩频信号到基带数据的直接检测，采用声表面波卷积器和相关器的扩频无线调制解调器在无线局域网中具有很大的潜力。少