ITU-R S 446-2-1978 Carrier Energy Dispersal for Systems Employing Angle Modulation by Analogue Signals or Digital Modulation in the Fixed-Satellite Service - Section 4C - Earth Station.pdf

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1、CCIR VOLUME*IV-II 90 = 4855212 0509884 4 W Rec. 446-2 RECOMMENDATION 446-2 CARRIER ENERGY DISPERSAL FOR SYSTEMS EMPLOYING ANGLE MODULATION BY ANALOGUE SIGNALS OR DIGITAL MODULATION IN THE FIXED-SATELLITE SERVICE (Study Programme 2D/4) (1966-1974-1978) The CCIR, CONSIDERING (u) that use of carrier en

2、ergy dispersal techniques in systems in the fixed-satellite service can result in a substantial reduction of interference to stations of a terrestrial service operating in the same frequency bands; (6) that in many cases the use of such techniques can result in a moderate to substantial reduction in

3、 the level of interference between systems in the fixed-satellite service opeyating in the same frequency bands, although in other cases the use of such techniques may not reduce the level of interference between such systems; (c) that such techniques are being regularly and successfully employed in

4、 systems in the fixed-satellite service without noticeable deterioration of the quality of operation; (d) that a Recommendation, (Spa2 - 1 i), * relating to carrier energy dispersal in systems in the fixed-satellite service, was adopted by the World Administrative Radio Conference for Space Telecomm

5、unications, Geneva, 197 1, UNANIMOUSLY RECOMMENDS 1. that systems in the fixed-satellite service should use carrier energy dispersal techniques, as far as is practicable and in a manner consistent with satisfactory operation of the systems (see Report 384, 0 2 and 3), with a view to spreading energy

6、 such that the interference to stations of a terrestrial service operating in the same frequency bands is maintained within specified tolerable limits at all times; 2. that the capability for carrier energy dispersal up to the maximum degree practicable (see Report 384) should be included in the design of satellite systems to be available for implementation when necessary to maintain a reduced level of interference between systems in the fixed-satellite service operating in the same frequency bands. * This Recommendation become Recommendation No. 103 of WARC, Geneva, 1979. -