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Research on elemental Technologies for Communication and Broacasting Integrated Services

通信广电综合业务基础技术研究

基本信息

批准号：
14550368
负责人：
NISHI Masahiro
金额：
$ 1.41万
依托单位：
Hiroshima City University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550368/
关键词：
Communication and Broadcasting Integration Radio Propagation UHF band GPS Recieved Level Contour Map Diversity Technique Wireless Multicast Link Capacity Controlled Method UHF帯TV放送波電力分布マップ電波搬

项目摘要

In this investigation, we have proposed the new type of information platforms, where mobile communication systems and digital terrestrial broadcasting systems are effectively fused. The digital terrestrial broadcasting media using UHF band from 470 to 770 MHz is applied to the download link to achieve broadband transmissions. To realize the proposed platforms, we have focused on the ratio propagation characteristics in the UHF band, and the high effective data distribution method on the platforms in this investigation.The UHF band radio propagation characteristics have been investigated based on the measurement. In the outdoor measurement, we utilized the measurement systems using GPS and UHF band receiver configured on the vehicle. By use of this measurement system, we can simultaneously measure the received level and the positioning data. And from the derived these data, we can configure the received level contour map around Hiroshima city. Evaluating the received level contour map combined with the terrain LOS area, it is found that the received level in UHF band has a high correlation to the terrain LOS area. On the other hand, from the results of indoor measurement, using the radio wave enters from outside to inside, it is clarified that there are many multi-path of radio wave at the receiver. The multi-path waves cause the large fading in the received level. To solve this problem, we have applied the diversity technique to the reception of the radio wave, and clarified that the diversity technique can largely improve the level fading.Moreover, in the investigation of the data distribution method, we have proposed the wireless multicast method that can deliver the data to many users using radio waves. And it is found that the proposed method can improve distribution efficiency controlling the link capacity even if the unicast service coexists on the same networks.

在这项研究中，我们提出了一种新型的信息平台，其中移动的通信系统和数字地面广播系统有效地融合。下载链路采用UHF频段470 ~ 770 MHz的数字地面广播媒体，实现宽带传输。为了实现该平台，本文重点研究了UHF频段的无线电波传播特性，以及平台上高效的数据分配方法，并在此基础上对UHF频段的无线电波传播特性进行了测量。在室外测量中，我们使用了车载GPS和UHF波段接收机的测量系统。通过使用该测量系统，我们可以同时测量接收电平和定位数据。根据这些数据，我们可以配置广岛城市周围的接收水平等高线图。结合地形视距区对接收电平等值线图进行评估，发现UHF频段接收电平与地形视距区有很高的相关性。另一方面，从室内测量的结果，使用无线电波从外部进入到内部，它是澄清，有许多多径的无线电波在接收器。多径波导致接收电平的大衰落。为了解决这一问题，我们在电波接收中应用了分集技术，阐明了分集技术可以大大改善电平衰落。此外，在数据分发方法的研究中，提出了可以使用电波向多个用户分发数据的无线多播方法。实验结果表明，即使单播业务共存于同一网络，该方法也能通过控制链路容量来提高分发效率。