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Research on a Communication Method Combining Multiply Transmitted and Received Signals inside a Limited Space Region

有限空间区域内多重发射和接收信号相结合的通信方法研究

基本信息

批准号：
62550286
负责人：
NAOKI INAGAKI
金额：
$ 1.22万
依托单位：
Nagoya Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

This project of research is concerned with constructing a stable radio network inside offices which uses low-power signals as an economical and flexible means of data transmission between computers and/or local control units. The following results sre obtained. 1. A fixed station antenna with 90 or 180 sector pattern has been designed, which radiates a signal into a room from a corner or a wall of the room and not to the outdoor space, thus enabling cableless access from arbitrarily located stations without imformation leakage. 2. The electrmagnetic field distribution inside an electromagnetically shielded room is measured and is statistically evaluated. The accumulative probability of the measured power distribution suggests that they are Rice- or Rayleigh distributed according to whether or not the fixed station antenna is seen from the measured point. 3. Three kinds of diversity reception: space diversity, polarization diversity and directivity diversity, have been tested to lower the bit error rate due to the multipath propagation inside the room. The maximum diversity gain of 9 DB was obtained by the directivity diversity with four branches.

这个研究项目致力于在办公室内构建一个稳定的无线网络，该网络使用低功率信号作为计算机和/或本地控制单元之间经济而灵活的数据传输手段。得到了以下结果。1.设计了一种90扇形或180扇形的固定站天线，它将信号从房间的角落或墙壁发射到房间内，而不是从室外空间，从而实现了从任意位置的站进行无线接入而不会发生信息泄漏。2.测量了电磁屏蔽室内的电磁场分布，并进行了统计分析。测量的功率分布的累积概率表明，根据从测量点是否可以看到固定站天线，它们是赖斯分布或瑞利分布。3.对空间分集、极化分集和方向性分集三种分集接收方式进行了实验，以降低室内多径传播引起的误码率。4个分支的方向性分集获得了9dB的最大分集增益。