ITU-R S 523-4-1992 Maximum Permissible Levels of Interference in a Geostationary- Satellite Network in the Fixed-Satellite Service Using 8-Bit PCM Encoded Telephony Caused by Othermis.pdf
《ITU-R S 523-4-1992 Maximum Permissible Levels of Interference in a Geostationary- Satellite Network in the Fixed-Satellite Service Using 8-Bit PCM Encoded Telephony Caused by Othermis.pdf》由会员分享,可在线阅读,更多相关《ITU-R S 523-4-1992 Maximum Permissible Levels of Interference in a Geostationary- Satellite Network in the Fixed-Satellite Service Using 8-Bit PCM Encoded Telephony Caused by Othermis.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Rec. 523-4 171 RECOMMENDATION 523-4 MAXIMUM PERMISSIBLE LEVELS OF INTERFERENCE IN A GEOSTATIONARY-SATELLITE NETWORK IN THE FIXED-SATELLITE SERVICE USING 8 BIT PCM ENCODED TELEPHONY, CAUSED BY OTHER NETWORKS OF THIS SERVICE (Question 50/4) (1978-1982-1986-1990-1992) The CCIR, considering a) that geos
2、tationary-satellite networks in the fixed-satellite service operate in the same frequency bands; b relative to its value in the absence of frequency sharing; that interference between networks in the fixed-satellite service degrades the bit error ratio performance c) different networks in that servi
3、ce should be such, as to give a reasonable orbit utilization efficiency; that it is desirable that the bit error ratio in networks in the fixed-satellite service caused by transmitters of d that the overall performance of a network should essentially be under the control of the system designer; e) n
4、etworks; that it is necessary to protect a network in the fixed-satellite service from interference by other such 0 that it is necessary to determine the maximum permissible interfering radio frequency power in a satellite system to establish space station and earth station characteristics such as r
5、equired protection ratios and minimum orbital spacing; s) into the earth station receiver; that networks in the fixed-satellite service may receive interference both into the space station receiver and h) be a controlled fraction of the total bit error ratio, as set out in Recommendation 522; that i
6、t is desirable that the increase in bit error ratio due to interference from other satellite networks should j) that where adjacent satellites serve networks with similar characteristics the largest interference contributions to a geostationary-satellite network will be from the networks using those
7、 adjacent satellites; but this may not be true where network characteristics are inhomogeneous; k) that the levels of interference between geostationary-satellite networks in the fixed-satellite service below 10 GHz are not expected to exhibit a large variation with time, and under these conditions
8、it is preferable to define the permissible interference limit as a fraction of the pre-demodulator noise power, as this allows multiple interference entries to be superimposed on each other on the basis of RF power addition; 1) that in frequency bands between 10 and 15 GHz where very high propagatio
9、n attenuation may occur for short periods of time, it would generally be desirable for systems to make use of adaptive up-link power control or earth- station site diversity or other techniques to counteract signal fading and that under these circumstances the levels of interference from other satel
10、lite systems would also not undergo a large variation with time; CCIR RECMN*523-4 72 H 4855232 05L8774 5T8 W 172 Rec. 523-4 m digital signal in the channel, that the carrier-to-interference ratio can be used to evaluate the degradation of the BER performance of a recommends 1. that networks in the f
11、ixed-satellite service operating in the same frequency bands below 15 GHz, and using geostationary satellites be designed and operated in such a manner that the total interference to an 1.2 in frequency bands in which the network practises frequency re-use, the interference power level, averaged ove
12、r any 10 min, should not exceed, for more than 20% of any month, 20% of the total noise power level at the input to the demodulator that would give rise to a bit error ratio of 1 in 106; 2. that the maximum level of interference power in any such 3. that the maximum level of interference noise power
13、 caused to that network should be calculated on the basis of the following values for the receiving earth station antenna gain, in a direction at an angle cp (in degrees) referred to the main beam direction: G = 32 - 25 log cp dBi for 1“ I cp 48“ G = -10 dBi for 48“ScpS 180“ except when the actual g
14、ain is known and is less than the above value, in which case the actual value should be used; 4. that the following Notes should be regarded as part of this Recommendation: Note 1 -For the calculation of the limits quoted in 0 1.1, 1.2 and 2 it should be assumed that the total noise power at the inp
15、ut to the demodulator is of thermal nature. Note 2 - It is assumed in this Recommendation that the interference from other satellite networks is of a continuous nature; further study is required with respect to cases where interference is not of a continuous nature. Note 3 -The values quoted in 4 1
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ITURS52341992MAXIMUMPERMISSIBLELEVELSOFINTERFERENCEINAGEOSTATIONARYSATELLITENETWORKINTHEFIXEDSATELLITESERVICEUSING8BITPCMENCODEDTELEPHONYCAUSEDBYOTHERMISPDF

链接地址:http://www.mydoc123.com/p-793637.html