Diseño De Un Sistema De Banda Ancha Dvb-S2

Universidad Polit´cnica de Madrid
e
Escuela T´cnica Superior de Ingenieros de Telecomunicaci´n
e
o
Radiocomunicaciones

UNIVERSAL SATELLITE SERVICE AT
1 Mbps USING DVB-S2 STANDARD

Javier de Alfonso Mi˜ambres
n
V´
ıctor S´nchez Mart´
a
ınez
Pablo Bernal Alc´zar
a
Marta Ventura Mart´
ınez
Group 19
May 26th, 2011

Abstract
This work studies the technical and legalspecifications to deploy a 1 Mbps internet service
using the satellite DVB-S2 standard. The most relevant ITU-R recommendations are presented to establish the main regulations concerning our service on the Ka-Band. The equipment that complies with our service is pre-selected, according to the DVB-S2 (downlink) and
DVB-RCS (uplink) standards used. The main propagation methods and the attenuations
associatedwith the air medium, as the effect of rain, clouds, atmospheric gases or noise temperature that will affect the signal in the link are also studied, to help design the link for
the most common atmospheric situations. Since the service is offered for the whole Europe,
a few reference cities are used to calculate these attenuations, and using this data the final
equipments are selected depending onthe area.
Keywords: Radiocommunications, DVB-S2, DVB-RCS, satellite communications, internet provider, signal attenuation analysis, attenuation, propagation characteristics.

Contents
1 Initial analysis of the relevant frequency bands to our
1.1 Regulation Articles . . . . . . . . . . . . . . . . . . . . .
1.2 Resolution 143 . . . . . . . . . . . . . . . . . . . . . . .
1.3 Otherconsiderations . . . . . . . . . . . . . . . . . . . .
2 Initial equipment search. DVB-S2 and
2.1 Project Specifications . . . . . . . . .
2.1.1 Antennas . . . . . . . . . . . .
2.1.2 iLNBs . . . . . . . . . . . . . .
2.1.3 Modems . . . . . . . . . . . . .
2.1.4 Connections . . . . . . . . . . .
2.2 Topology . . . . . . . . . . . . . . . .
2.2.1 Independent installation . . . .
2.2.2 StarTopology . . . . . . . . . .
2.3 Standards’ Main Characteristics . . .
2.3.1 DVB-S2 . . . . . . . . . . . . .
2.3.2 DVB-RCS . . . . . . . . . . . .
2.4 Equipment . . . . . . . . . . . . . . .
2.4.1 Modems . . . . . . . . . . . . .
2.4.2 Antennas . . . . . . . . . . . .
2.4.3 Transceiver . . . . . . . . . . .

DVB-RCS characteristics
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3 Identification of most relevant propagation methods
3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Attenuation factors . . . . . . . . . . . . . . .. . . . .
3.2.1 Free space attenuation . . . . . . . . . . . . . .
3.2.2 Atmospheric gases . . . . . . . . . . . . . . . .
3.2.3 Precipitation and cloud . . . . . . . . . . . . .
3.2.4 Attenuation due to sand and dust storms . . .
3.2.5 Noise temperature . . . . . . . . . . . . . . . .
3.2.6 Cross–polarization effects . . . . . . . . . . . .
3.3 LLUDESGA’s Results . . . . . . . . . . . . .. . . . .
3.3.1 Atmospheric gases . . . . . . . . . . . . . . . .
3.3.2 Attenuation caused by precipitation and cloud
3.3.3 Counter–polarization . . . . . . . . . . . . . . .
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