ImageVerifierCode 换一换
格式:PDF , 页数:2 ,大小:17.36KB ,
资源ID:792472      下载积分:10000 积分
快捷下载
登录下载
邮箱/手机:
温馨提示:
如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
如填写123,账号就是123,密码也是123。
特别说明:
请自助下载,系统不会自动发送文件的哦; 如果您已付费,想二次下载,请登录后访问:我的下载记录
支付方式: 支付宝扫码支付 微信扫码支付   
注意:如需开发票,请勿充值!
验证码:   换一换

加入VIP,免费下载
 

温馨提示:由于个人手机设置不同,如果发现不能下载,请复制以下地址【http://www.mydoc123.com/d-792472.html】到电脑端继续下载(重复下载不扣费)。

已注册用户请登录:
账号:
密码:
验证码:   换一换
  忘记密码?
三方登录: 微信登录  

下载须知

1: 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。
2: 试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。
3: 文件的所有权益归上传用户所有。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 本站仅提供交流平台,并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。

版权提示 | 免责声明

本文(ITU-R QUESTION 236-2002 Characteristics of systems in the broadcasting-satellite service (sound) for individual reception by means of portable and vehicular receivers《使用便携式和车载接收机的个.pdf)为本站会员(towelfact221)主动上传,麦多课文库仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文库(发送邮件至master@mydoc123.com或直接QQ联系客服),我们立即给予删除!

ITU-R QUESTION 236-2002 Characteristics of systems in the broadcasting-satellite service (sound) for individual reception by means of portable and vehicular receivers《使用便携式和车载接收机的个.pdf

1、QUESTION ITU-R 23/6*Characteristics of systems in the broadcasting-satellite service (sound) for individual reception by means of portable and vehicular receivers (1990-1993-2000-2002) The ITU Radiocommunication Assembly, considering a) that there is an interest shown by some countries, in a sound-b

2、roadcasting service covering a fairly large area with the same programme, and giving adequate quality at all times when using portable and vehicular receivers; b) that such a service cannot always be provided economically by terrestrial networks but might be feasible by satellite systems; c) that be

3、cause of the levels of power flux-density required for reception by portable and vehicular receivers sharing with terrestrial services could be difficult; d) that advanced digital modulation and coding systems with low power flux-density requirements and improved sharing capabilities have been succe

4、ssfully demonstrated; e) that different source coding rates can be used for broadcasting-satellite service (BSS) (sound) systems depending on the sound quality needed; f) that the World Administrative Radio Conference for Dealing with Frequency Allocations in Certain Parts of the Spectrum (Mlaga-Tor

5、remolinos, 1992) (WARC-92) allocated frequencies to the BSS (sound) and to complementary terrestrial broadcasting in the bands 1 452-1 492 MHz, 2 310-2 360 MHz, and 2 535-2 655 MHz for digital sound broadcasting to portable and vehicular receivers; g) that Resolution 528 (WARC-92) resolved that a co

6、mpetent conference be convened by the ITU preferably not later than 1998 for the planning of BSS (sound) in the bands allocated for this service and calls upon the Radiocommunication Study Groups to conduct the necessary preparatory studies, decides that the following Question should be studied 1 Wh

7、at are the service objectives and what are the different service concepts using satellites that can meet these objectives? 2 What are the propagation impairments likely to be encountered in various receiving environments for the bands allocated to the service? 3 What mitigation techniques are availa

8、ble for overcoming the anticipated propagation impairments? 4 What are the types and characteristics of the most suitable source coding algorithms and channel coding modulation techniques? _ *Studies related to this Question should be brought to the attention of the International Electrotechnical Co

9、mmission (IEC). - 2 - 5 What are the characteristics to be specified for the receivers, and in particular for the receiving antennas of transportable, portable and/or mobile receivers? 6 What are the characteristics to be specified for the satellites, in particular as regards the choice of the orbit

10、, the transmission power and the coverage, taking into account the possibility of mixed satellite/terrestrial systems? 7 What are the bandwidth requirements for the feeder links? 8 What frequency allocations to the fixed-satellite service are most suitable for the feeder links? 9 What are the estima

11、ted costs of the transmission delivery system and the portable and vehicular receivers? 10 What are the optimal sharing arrangements with the complementary terrestrial digital sound-broadcasting service? 11 What are the test procedures and measurement methods that should be used for overall performa

12、nce evaluation of digital sound-broadcasting systems? NOTE 1 See Report ITU-R BO.2006, the ITU-R Handbook on Digital Sound Broadcasting, Geneva 2002, and Recommendations ITU-R BO.789 and ITU-R BO.1130. NOTE 2 The frequency sharing and service implementation issues are raised in Question ITU-R 57/6, further decides 1 the result of the above studies should be included in (a) Recommendation(s); 2 the above studies should be completed by 2006.

copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
备案/许可证编号:苏ICP备17064731号-1