ANÁLISIS DE INTERFERENCIA CO-CANAL EN …ANÁLISIS DE INTERFERENCIA CO-CANAL EN SISTEMAS DVB-S...
Transcript of ANÁLISIS DE INTERFERENCIA CO-CANAL EN …ANÁLISIS DE INTERFERENCIA CO-CANAL EN SISTEMAS DVB-S...
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ANÁLISIS DE INTERFERENCIA CO-CANAL
EN SISTEMAS DVB-S
CO-CHANNEL INTERFERENCE ANALYSIS IN DVB-S SYSTEMS
Ing. Aurora Fernández Bezanilla
Ms.C. Abdel Martínez Alonso
Marzo 2013
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ABSTRACT
This presentation describes 3 experiments that characterize the
DVB-S performance and ruggedness against co-channel
interference. In Experiment 1 was measured the carrier to
interference threshold for the reception in DVB-S system. In
Experiment 2, was determined the bit error ratio threshold for a
range of C/I levels in the vicinity of the threshold value obtained in
the previous experiment. In Experiment 3 was determined the
system response against periodic and burst signals within the
operating band.
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TOPICS
• Digital TV via Satellite. DVB-S standard.
• C/I and BER thresholds for the reception in the DVB-S system.
• DVB-S performance against interference noise.
Experiments results.
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Two TV by satellite distribution
platforms types are mainly used for
television and radio: Fixed Service
Satellite (FSS), and Direct Broadcast
Satellite (DBS).
FSS
FSS are normally used for broadcast
feeds to and from television networks
and local affiliate stations, business
television, videoconferencing, and
commercial telecommunications.
DBS is a term used to refer to satellite television broadcasts intended
for home reception.
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FSS use the C band (3.7 to 4.2 GHz), and the lower portions of the
Ku bands (11.7 to 12.5 GHz). DBS use only a portion of the Ku band
(11.7 GHz to 12.7 GHz).
FSS
The world's first commercial satellite systems used the "C" band
frequency range. But the amount of power that any C-band satellite
could transmit has to be limited to a level that would not cause
interference to terrestrial microwave links.
The first commercial "Ku" band satellites made their appearance in
the late 1970s and early 1980s. Relatively few terrestrial
communications networks were assigned to use this frequency band;
Ku-band satellites therefore could transmit higher-powered signals
than their C-band counterparts
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ETS 300 421: STANDARD DVB-S
Describes the modulation and channel coding system for satellite
digital multi-programme Television (TV)/High Definition Television
(HDTV) services to be used for primary and secondary distribution in
Fixed Satellite Service and Broadcast Satellite Service bands.
Most digital satellite TV broadcasters today are using DVB-S
standard. It was first published in January 1995 by the European
Telecommunication Standards Institute (ETSI).
What makes the DVB standard a significant development is its ability
to serve as a unified standard that can be applied across a variety of
distribution platforms.
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ETS 300 421: STANDARD DVB-S
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ETS 300 421: STANDARD DVB-S
DVB-S performance against interference
RECEPTION OK
YES
NO C/N > C/N threshold
C/I > C/I threshold
BER < BER thresholdNO RECEPTION
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TRANSPONDER USED IN THE EXPERIMENTS
• Satellite Hispasat 1D
• Free to Air Channel
• Center Frequency 11.884 GHz
• Band Width 36 MHz
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TV-Ro STATION
IRD
TVLNB
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EXPERIMENTS
SET
SPECTRUM
ANALYZER
IRD
TVLNB
SIGNAL GENERATOR
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INTERFERENCE
SIGNAL
SPECTRUM
ANALYZER
IRD
TVLNB
SIGNAL GENERATOR
• Single carrier,
channel frequency
center.
• Carrier swept
inside the channel
BW.
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EXPERIMENT 1: C/I
RESULTS
C/I
C/I
MEASURE
C/I
THEORY
MIN 17.8 16.6
MAX 20.6 22.2
AVERAGE 19.2
C/I = C/N +12.2 (dB)
C/N min (C/N threshold)
C/N max (minimum loss)
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EXPERIMENT 2: BERRESULTS
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EXPERIMENT 3: Periodic or burst signal ?
RESULTS
tout
tin
tout
tin2. Burst signal
1. Periodic signal
BWsalto= BW3dB_canal DVB-S
BWsalto< BW3dB_canal DVB-S
BER1 = BER2
worst case
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CONCLUSIONS
In all experiment the results were
consistent with those expected.
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Thanks!