Maximizing Satellite Transmission Efficiency With DVB-S2
Gidi Raz
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• The Challenge • What is DVB-S2• DVB-S2 New Tools & Technologies• DVB-S2 Business Model
Agenda
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The Challenge
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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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
So what do we need?
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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-DSNGNew 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
Modulation DVB-S DVB-S2 DVB-S2Compression Mpeg2 Mpeg2 Mpeg4Average Bit Rate 3.3 3.3 1.5Transponder 36Mhz 36Mhz 36MhzTotal Available B/W 33Mbps 48Mbps 48Mbps# of Channels 10 15 32
Moving from S to S2 & from Mpeg2 to Mpeg4
Using 36Mhz transponder using different modulation and compression scheme
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DVB-S2 Why the new system?
Performance Comparison
0
0.5
1
1.5
2
2.5
3
3.5
0 2 4 6 8 10 12
Eb / No
Bit
s/S
ec
/Hz
DVB-S and DSNG DVB-S2
2.5dB = 33% more useful data rate, or 2.5m Vs. 4.5m antenna
Shannon limit
DVB-S2
DVB-S & DSNG
2.5 dB margin gain
signal-to-noise ratio
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DVB-S2 and Broadcast applications (DTH)
13 SDTV MPEG2
26 SDTV h.264
10 SDTV MPEG2
20 SDTV h.264
10 SDTV MPEG2
21 SDTV h.264
7 SDTV MPEG2
15 SDTV h.264
3 HD MPEG2
6 HD h.264
2 HD MPEG2
5 HD h.264
2 HD MPEG2
5 HD h.264
1 HD MPEG2
3 HD h.264
58.8 Mbps (+32%)44.4 Mbps46 Mbps (+36%)33.8 Mbps
8PSK 23QPSK 7/8QPSK 3/4QPSK 2/3
29.7 Mbauds
(ROF 0.25)
27.5 Mbauds
(ROF 0.35)
30.9 Mbauds
(ROF 0.20)
27.5 Mbauds
(ROF 0.35)
DVB-S2DVB-SDVB-S2DVB-S
SATELLITE EIRP 53.7 dBWSATELLITE EIRP 51 dBW
Typical 36MHz transponder usage with DVB-S and DVB-S2:
Number of HD channels
Number of SD channels
Bit rate
Modulation
Symbol Rate
Roll-Off factor
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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
-3dB
35%
25%
-26dB
20%
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New Modulation Constellations
00
I
Q
10
11 01
Q=LSB I=MSB
000
I
Q
011
111
001
LSB MSB
101
010
110
100
text
1100
1101 1111
1110
0000
0100
0101
0001
1001 1011
0011
0111
0110
0010
1010 1000
I
Q
=R2 / R1
LSB MSB
R1
R2
text
10001
10011 10111
10101
00000
10000
10010
00010
00011 00111
00110
10110
10100
00100
00101 00001
I
Q
=R2 / R1 =R3 / R1
LSB
MSB
R1
R2
R3
11000
01000
11001
01001 01101
11101
01100
11100
11110
01110
11111
01111 01011
11011
01010
11010
QPSK2 bits/symbol
8PSK3 bits/symbol
16APSK4 bits/symbol
32APSK5 bits/symbol
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Three Operation Mode
CCM Constant Coding and ModulationAll frames use the same (fixed) parameters
VCM Variable Coding and ModulationDifferent streams/services are coded with different (fixed) parameters on the same carrier
ACM Adaptive Coding and ModulationEach 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)
DTTMUX
1
DTTMUX
2
Transport Stream 1
Transport Stream 2
1
2
MERGER
StreamAdapter
FECCoder
Mod
QPSKRate 5/6
Constant Coding & Modulation
Mode adapter
DVB-S2 Modulator
SD
SD
SD
SD
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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)
MUX1
MUX2
Transport Stream 1
Transport Stream 2
1
2
MERGER
StreamAdapter
FECCoder
Mod
QPSKRate 3/4
16 APSKRate 3/4
Mode adapter
DVB-S2 Modulator
SD
SD
HD
HD
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Applications
3. DSNG Services using ACM 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 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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Business Model - Contribution DVB-S DVB-S2Number of ChannelAvg. Bit Rate per Channel MbpsTotal. Mpeg2 /SD Distribution bit rate (Mbps) MbpsRoll off Factor 0.35 0.20MOD Cod QPSK 3/4 QPSK 9/10Avg. Mpeg2 /SD Distribution B/W (Mhz) DVB-S 4.88 3.37 MhzCost per Mhz / Hour $300 $300# of Hours/session 3 3Transponder cost per session $4,395 $3,030 $# of Broadcast Session per Year 50 50Total Transponder cost per year $219,734 $151,500 $Total 1 year Saving when using DVB-S2Total 10 year Saving when using DVB-S2Redundemcy (Y/N) No 31%# of Encoders# of IRD'sDVB-S2 Encoder + Modulator Cost $25,000 $S2 IRD Cost $6,500 $Total Cost $31,500 $
ROI 5.5 Months
DSNG ROI model for moving from S to S2
5.0
$68,234
1
$682,340Saving
5.01
1
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Business Model - DistributionDVB-S DVB-S2Number of ChannelAvg. Bit Rate per Service MbpsTotal. Mpeg2 /SD Distribution bit rate (Mbps) MbpsRoll off Factor 0.35 0.20MOD Cod QPSK 3/4 QPSK 8/9Avg. Mpeg2 /SD Distribution B/W (Mhz) DVB-S 34.18 23.86 MhzCost per Mhz / MonthTransponder cost per Month $170,904 $119,306 $Total Transponder cost per Year $2,050,851 $1,431,675 $Total 1 year Saving when using DVB-S2Total 5 year Saving when using DVB-S2Headend Redundemcy (Y/N) No 30%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 $20,000IRD Without DVB-S2 interfaceCost $900IRD With DVB-S2 interfaceCost $2,500Total Cost $261,000 $
ROI 5.1 Months
5 Year Saving $2,834,880
10
3.510
$5,000
1110
$3,095,880
40
10
ROI model for moving from S to S2
35.0
$619,176Saving
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Summary
Take advantage of the new technology Mpeg4 / DVB-S2
Save at least 30% bandwidth / Money
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Thank You