DVB S2 Overview Kenya Day

Maximizing Satellite Transmission Efficiency With DVB-S2

Gidi Raz

2 Scopus information not to be disclosed or reprinted without Scopus prior written permission

• The Challenge • What is DVB-S2• DVB-S2 New Tools & Technologies• DVB-S2 Business Model

Agenda


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


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?


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


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


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


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


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.


Three Spectrum Shapes

-3dB

35%

25%

-26dB

20%


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


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


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


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


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


Applications

3. DSNG Services using ACM (Single Transport Stream, information rate varying in time)


No ACM /VCM


With ACM and VCM


Business Models


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)


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


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


Summary

Take advantage of the new technology Mpeg4 / DVB-S2

Save at least 30% bandwidth / Money

Scopus information not to be disclosed or reprinted without Scopus prior written permission 30

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DVB S2 Overview Kenya Day

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