Transcript DVB-S2 Overview

Maximizing Satellite Transmission
Efficiency With DVB-S2
Gidi Raz
Agenda
• The Challenge
• What is DVB-S2
• DVB-S2 New Tools & Technologies
• DVB-S2 Business Model
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The Challenge





3
Transmission costs (1.5-2M$ / 36 Mhz / Year)
Increasing number of channels
Moving to HD – High bandwidth consumer
Reduce OPEX / CAPEX
Limitations in current DVB-S and DVB-DSNG
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So what do we need?
 Increased data throughput in a given bandwidth, or
 Use less satellite capacity and save money
 Increased availability through improved link margin –
More robust
 Increased coverage area
 Smaller dish
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What is DVB-S2 ?

New DVB standard for digitial satellite communications
 Up to 30% bandwidth saving
 Up to 2.5 dB margin gain

Meant to replace DVB-S & DVB-DSNG
New features such as:
 Support of multiple streams on a single carrier
 Variable and Adaptive Coding and Modulation

Much better spectral efficiency
So close to the Shannon limit that it could be the last DVB-S
standard!
Shannon's Law
Expresses the maximum possible data speed that can be obtained in a data channel.
Shannon's Law says that the highest obtainable error-free data speed, expressed in
bits per second (bps), is a function of the bandwidth and the signal-to-noise ratio
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Short Example
Using 36Mhz transponder using different modulation and compression scheme
Moving from S to S2 & from Mpeg2 to Mpeg4
Modulation
DVB-S
DVB-S2 DVB-S2
Compression
Mpeg2
Mpeg2
Mpeg4
Average Bit Rate
3.3
3.3
1.5
Transponder
36Mhz
36Mhz
36Mhz
Total Available B/W
33Mbps
48Mbps
48Mbps
# of Channels
10
15
32
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DVB-S2 Why the new system?
Performance Comparison
2.5dB = 33% more useful data rate, or 2.5m Vs. 4.5m antenna
3.5
3
Bits/Sec/Hz
2.5
2
1.5
1
0.5
2.5 dB margin gain
0
0
2
4
6
8
signal-to-noise ratio Eb / No
DVB-S and DSNG
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DVB-S2
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DVB-S2 and Broadcast applications (DTH)
Typical 36MHz transponder usage with DVB-S and DVB-S2:
SATELLITE EIRP 51 dBW
Symbol Rate
Roll-Off factor
Modulation
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SATELLITE EIRP 53.7 dBW
DVB-S
DVB-S2
DVB-S
DVB-S2
27.5 Mbauds
(ROF 0.35)
30.9 Mbauds
(ROF 0.20)
27.5 Mbauds
(ROF 0.35)
29.7 Mbauds
(ROF 0.25)
QPSK 2/3
QPSK 3/4
QPSK 7/8
8PSK 23
Bit rate
33.8 Mbps
46 Mbps (+36%)
44.4 Mbps
58.8 Mbps (+32%)
Number of SD
channels
7 SDTV MPEG2
15 SDTV h.264
10 SDTV MPEG2
21 SDTV h.264
10 SDTV MPEG2
20 SDTV h.264
13 SDTV MPEG2
26 SDTV h.264
Number of HD
channels
1 HD MPEG2
3 HD h.264
2 HD MPEG2
5 HD h.264
2 HD MPEG2
5 HD h.264
3 HD MPEG2
6 HD h.264
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DVB-S2 SYSTEM Tools

Powerful FEC system based on LDPC (Low-Density Parity Check) codes

Wide range of code rates (from 1/4 up to 9/10)

New Modulation schemes ranging from 2 to 5 bit/second/Hz spectrum
efficiency - QPSK, 8PSK, 16APSK, 32APSK

Set of three spectrum shapes with roll-off factors 0.35, 0.25 and 0.20

Flexible stream adapter, suitable to operate with single and multiple TS on
the same carrier with different modulation and FEC

Variable & Adaptive Coding and Modulation (VCM/ACM) functionality,
allowing to optimise channel coding and modulation on a frame-by-frame
basis.
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Three Spectrum Shapes
35%
25%
20%
-3dB
-26dB
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New Modulation Constellations
Q
I=MSB
Q
Q=LSB
MSB
100
LSB
110
10
000
00


QPSK
2 bits/symbol
I

010
001
8PSK
I
3 bits/symbol
011
11
01
101
111
Q
Q
1010
1000
01101
11101
01001
MSB
0010
0000
R2
01100
MSB
R1
1100
0100
11110
16APSK
4 bits/symbol
00000
00100
10100
10101
1101
0011
= R2 / R1
0101
16
0001
1011
10000
10001
R1
11000
I
text
10110
10111
1001
10010
10011
01110
00010
00110

01000
R2
I
text
1111
LSB
00001
LSB
1110
0111
00101
R3
11100
0110
11001

11111
  =R2 / R1
  =R3 / R1
00111
01111
00011
01011
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11011
11010
01010
32APSK
5 bits/symbol
Three Operation Mode
CCM Constant Coding and Modulation
All frames use the same (fixed) parameters
VCM Variable Coding and Modulation
Different streams/services are coded with different (fixed)
parameters on the same carrier
ACM Adaptive Coding and Modulation
Each frame is coded with its own set of parameters. Parameters
are modified dynamically according to the reception conditions for
each receiver
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Distribution of multiple TS multiplexes
1. DTT Transmitters
(Multiple TS, Constant Code Modulator - CCM)
DVB-S2 Modulator
QPSK
Rate 5/6
Mode adapter
SD
DTT
MUX
1
1
Transport Stream 1
SD
SD
DTT
MUX
2
2
Transport Stream 2
M
E
R
G
E
R
SD
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Stream
Adapter
FEC
Coder
Mod
Constant
Coding &
Modulation
Distribution of multiple TS multiplexes
• Perfect fit for DVB-T distribution
• 2 Transport streams of 24 Mbps on single carrier (36 Mhz)
• Can carry more than 30 Mpeg4/SD channels or 6-8 HD Channels
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Applications- SDTV and HDTV broadcasting
2. Differentiated channel protection
(Variable Code Modulation, Multiple TS - VCM)
DVB-S2 Modulator
QPSK
Rate 3/4
Mode adapter
SD
MUX
1
1
Transport Stream 1
SD
HD
MUX
2
2
Transport Stream 2
HD
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M
E
R
G
E
R
Stream
Adapter
FEC
Coder
Mod
16 APSK
Rate 3/4
Applications
3. DSNG Services using ACM
(Single Transport Stream, information rate varying in time)
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No ACM /VCM
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With ACM and VCM
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Business Models
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Two Examples
 Contribution





Delivering 5 Mbps from point to point
DBV-S: QPSK ¾ , with roll off factor of 0.35 requires 4.88 Mhz
DBV-S2: QPSK 9/10 , with roll off factor of 0.2 requires 3.37 Mhz
Total bandwidth saving of 30%
Total cost saving is $70,000 a year (ROI 5 Months)
 Distribution





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Distribution of 10 channels to 10 location (average 3.5 Mbps/Ch.)
DBV-S: QPSK ¾ , with roll off factor of 0.35 requires 34.18 Mhz
DBV-S2: QPSK 9/10 , with roll off factor of 0.2 requires 23.86 Mhz
Total bandwidth saving of 30%
Total cost saving is $620,000 a year (ROI 5 Months)
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DSNG ROI model for moving from S to S2
Business Model - Contribution
Number of Channel
Avg. Bit Rate per Channel
Total. Mpeg2 /SD Distribution bit rate (Mbps)
Roll off Factor
MOD Cod
Avg. Mpeg2 /SD Distribution B/W (Mhz) DVB-S
Cost per Mhz / Hour
# of Hours/session
Transponder cost per session
# of Broadcast Session per Year
Total Transponder cost per year
Total 1 year Saving when using DVB-S2
Total 10 year Saving when using DVB-S2
Redundemcy (Y/N)
# of Encoders
# of IRD's
DVB-S2 Encoder + Modulator Cost
S2 IRD Cost
Total Cost
ROI
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DVB-S
DVB-S2
1
5.0
5.0
0.35
0.20
QPSK 3/4
QPSK 9/10
4.88
3.37
$300
$300
3
3
$4,395
$3,030
50
50
$219,734
$151,500
$68,234
$682,340
No
1
1
$25,000 $
$6,500 $
$31,500 $
5.5 Months
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Mbps
Mbps
Mhz
$
$
Saving
31%
ROI model for moving from S to S2
Business Model - Distribution DVB-S
Number of Channel
Avg. Bit Rate per Service
Total. Mpeg2 /SD Distribution bit rate (Mbps)
Roll off Factor
MOD Cod
Avg. Mpeg2 /SD Distribution B/W (Mhz) DVB-S
Cost per Mhz / Month
Transponder cost per Month
Total Transponder cost per Year
Total 1 year Saving when using DVB-S2
Total 5 year Saving when using DVB-S2
Headend Redundemcy (Y/N)
Avg. Number of Channels per site
# of receiving points
# of Encoders
# of IRD's with DVB-S2 Interface (*6)
# of IRD's without DVB-S2 Interface (*6)
Encoder +S2 Modulator + Mux Cost
IRD Without DVB-S2 interfaceCost
IRD With DVB-S2 interfaceCost
Total Cost
ROI
528Year Saving
DVB-S2
10
3.5
35.0
0.35
0.20
QPSK 3/4
QPSK 8/9
34.18
23.86
$5,000
$170,904
$119,306
$2,050,851
$1,431,675
$619,176
$3,095,880
No
10
10
11
10
40
$20,000
$900
$2,500
$261,000 $
5.1 Months
$2,834,880
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Mbps
Mbps
Mhz
$
$
Saving
30%
Summary
Take advantage of the new technology
Mpeg4 / DVB-S2
Save at least 30% bandwidth / Money
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Thank You
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