Study of Communication Methods Combining Multiple Transmitted and Received Signals inside a Limited Space Region

有限空间区域内结合多个发送和接收信号的通信方法研究

基本信息

批准号：
01550310
负责人：
INAGAKI Naoki
金额：
$ 1.47万
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：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550310/
关键词：
Indoor radio communication Multipath propagation MUSIC algorithm Estimation of direction of arrival Rotatory scanning of small antenna Estimation of delay time Diversity reception High resolution 遅延時間分布推定

项目摘要

The idea of implementing indoor radio communication systems appears to be an attractive proposition. However, indoor radio multipath propagation environments limit the design of these systems. Therefore, this project of research is concerned with clarifying the characteristics of indoor radio propagation. For this purpose, it is most effective to estimate the directions of arrival and delay times of multipath waves. The results obtained are described below.1. We first proposed a method of estimating the directions of arrival. This method utilizes the MUSIC algorithm which is a spectrum analysis technique owning high resolution property and applied to the data obtained by the rotatory scanning of antenna. As a result of computer simulation and some experiments, it is shown that the proposed method has high resolution of 5 degrees with the rotation radius of 1 wavelength.2. Next, we proposed a method of estimating propagation delay time of multipath waves which also applies the MUSIC alg … More orithm to the conventional frequency sweeping method. The results of computer simulation and experiments have shown that the proposed method has high resolution of 3ns with the frequency bandwidth of 100MHz.3. Finally, we proposed a method of simultaneously estimating both the directions of arrival and delay times of multipath waves. The great advantage of this method is that we can easily identify the propagation paths of incident waves based on the estimation results. This method also utilizes the MUSIC algorithm. We carried out experiments in a limited region. From the estimation results, we recognized 5 to 10 significant waves, the directions of which are almost uniformly distributed in space and also the delay times of which are less than 50 ns. These results demonstrated the indoor radio environments are very complicated. Thus, we confirmed that diversity reception, especially the directivity diversity, is effective for indoor radio communication systems under multipath propagation environments. Less

实施室内无线电通信系统的想法似乎是一个有吸引力的提议，然而，室内无线电多径传播环境限制了这些系统的设计，因此，该研究项目旨在阐明室内无线电传播的特性。为了达到这一目的，估计多径波的到达方向和延迟时间是最有效的。我们首先提出了一种估计到达方向的方法，该方法是一种频谱。具有高分辨率特性的分析技术并将其应用到天线旋转扫描得到的数据上，经过计算机仿真和实验表明，该方法在旋转半径为1个波长的情况下具有5度的高分辨率。一种将MUSIC算法应用于扫频法的多径波传播延迟时间估计方法。常规计算机仿真和实验结果表明，该方法具有3ns的高分辨率和100kHz的频率带宽。 100MHz.3.最后，我们提出了一种同时估计多径波的到达方向和延迟时间的方法，该方法的巨大优点是我们可以根据估计结果轻松识别入射波的传播路径。该方法还利用了MUSIC算法，在有限的区域内进行了实验，从估计结果中，我们识别出5到10个显着波，这些波的方向在空间上几乎均匀分布，并且延迟时间小于50。这些结果表明室内无线电环境非常复杂，因此我们证实分集接收，尤其是方向性分集，对于多径传播环境下的室内无线电通信系统是有效的。