ISSN:0737-2884    

DOI:10.1002/sat.4600010102

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

ISSN:0737-2884    

DOI:10.1002/sat.4600010103

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

摘要:

AbstractFollowing three years of conceptual studies, and a competitive procurement contract, construction of the INTELSAT VI series of satellites is now under way. The design represents a major step forward in satellite size and technical complexity. Sixfold frequency reuse and on‐board satellite switching are particularly important development

ISSN:0737-2884    

DOI:10.1002/sat.4600010104

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

摘要:

AbstractThe INTELSAT TDMA/DSI System is a complex, centrally‐controlled communications system, the performance of which will depend to some extent on the effectiveness of the alignment, maintenance and testing procedures. However, the wide range of disciplines encountered in the system mean staff currently familiar with the existing FDMA network may have difficulty with these new and unfamiliar fields. The purpose of this series of four papers is to provide an understanding of the necessity for, and operation of, the SSOG test procedures for the INTELSAT TDMA/DSI system. In this first part, the overall system and its testing requirements will be discussed as a foundation for a discussion of the SSOG tests in Part

ISSN:0737-2884    

DOI:10.1002/sat.4600010105

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

摘要:

AbstractThe continuing need for increased traffic capacity for telephony over satellite links combined with the availability of low cost and accurate LSI compander chips has caused renewed interest in SSB satellite transmission using companders to reduce the impairments caused by thermal noise, interference and intermodulation encountered on the transmission link. This type of transmission is designated as CSSB/AM and may be operated in a multicarrier per transponder (FDMA) manner. The capacity achieved is a function of the average power during the occurrence of speech and because this value has decreased in modern telephone systems, the advantages to be gained from CSSB/AM are increased.This paper presents the development of expressions for channel capacity of CSSB/AM links as a function of carrier‐to‐noise ratio and speech power level while active. These are used to estimate the capacity achievable in an INTELSAT IV type transpon

ISSN:0737-2884    

DOI:10.1002/sat.4600010106

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

摘要:

AbstractINTELSAT has been studying the application of compandors in its existing FDM/FM system for a number of years. Laboratory and field tests have demonstrated the technical suitability of these devices for use on INTELSAT satellite links. Companded FDM/FM (CFDM) has recently been approved for use by INTELSAT signatories. The first CFDM service was inaugurated in April 1983 between the Etam Standard A earth station (U.S.A.) and the Grand Cayman Standard B earth, station (Cayman Islands).

ISSN:0737-2884    

DOI:10.1002/sat.4600010107

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

摘要:

AbstractA comprehensive series of subjective tests are carried out on narrow‐band companded F.M. and continuously controlled delta modulation SCPC satellite systems. In order to resolve discrepancies reported in the literature both Youden square and mean opinion scale listening tests have been applied. Both white noise and modulated noise reference conditions are employed and the performance of the systems, in terms of signal to noise and equivalentQfactor are given for variousC/N0fixed and mobile‐maritime performance requireme

ISSN:0737-2884    

DOI:10.1002/sat.4600010108

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

摘要:

AbstractWith the fluctuating inter‐nodal traffic levels that characterize light‐route networks, demand assignment (DA) provides the means of increasing the system's effective capacity. This paper focuses on the application of DA in light‐route TDMA, and proposes a control architecture that is well‐suited to service of heterogeneous traffic. The major advantage of the proposed architecture is its benefit from both the efficient resource management typical of centralized schemes, and the shorter response times of distributed schemes. The impact of the assignment algorithm on the grade of service to heterogeneous populations, and the difficulty in quantifying this impact are also addressed. Results from analytical and simulation models illustrating resource utilization are pr

ISSN:0737-2884    

DOI:10.1002/sat.4600010109

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

ISSN:0737-2884    

DOI:10.1002/sat.4600010110

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

ISSN:0737-2884    

DOI:10.1002/sat.4600010111

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY