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ÖNORM EN 301460-3 V 1.1.1:2001-01
Fixed Radio Systems - Point-to-multipoint equipment - Part 3: Point-to-multipoint digital radio systems below 1 GHz - Additional parameters for FH-CDMA systems
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Разработчик:
ON
ICS:
33.060.30 Radio relay and fixed satellite communications systems / Радиорелейные и стационарные спутниковые системы связи
Описание
The present document specifies the minimum requirements for system parameters of Point-to-Multipoint (P-MP) Radio
Systems in the Fixed Services operating below 1 GHz.
The system will provide access to both public and private networks (PSTN, PDN...) by means of the various
standardized network interfaces (e.g. 2-wire loop, ISDN).
The system may be applied to build access networks by means of a multi cellular architecture, covering rural areas. An
important requirement for rural areas is the ability to cope with non line of sight conditions.
A rural area may be defined by the following 3 characteristics:
1) telephone density of 0,01 to 1 telephone per km2;
2) connection distance from the telephone to the PSTN is tens of kms. This backhaul distance can be served by
copper, point to point microwave or in a convenient way as part of a Point to Multipoint system;
3) difficult access to the region due to poor infrastructure such as roads. This may be caused by lack of proper
infrastructure or simply a difficult terrain in which the infrastructure is deployed. Hills, lakes, trees, rivers and
varying climatic conditions can all account for this difficulty of access and propagation.
Point-to-Multipoint Radio-Relay Systems (P-MP) use, in principle, different access methods, taking into account the
basic physical parameters of frequency, code and time. This leads to the basic access methods of:
Time Division Multiple Access (TDMA);
Frequency Hopping Code Division Multiple Access (FH CDMA);
Frequency Division Multiple Access (FDMA);
Direct Sequence Code Division Multiple Access (DS-CDMA).
As some technical parameters are different for the various access methods the present document is divided in five parts
(see forward).
Parts 2, 3, 4 and 5 should be used in conjunction with Part 1, describing the basic parameters common to all access
methods.
A basic description of the different access methods and a compar (...abbreviated)
Ключевые слова:
Telekommunikation,Fernmeldetechnik,Nachrichtentechnik,Kommunikationstechnologie,Informationsverarbeitung,Funksystem,Mehrpunktverbindung,Ausstattung,DRRS,Punktverbindung,RLL,FWA,FH-CDMA,CDMA