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Gidi Raz. Maximizing Satellite Transmission Efficiency With DVB-S2. Agenda. The Challenge What is DVB-S2 DVB-S2 New Tools & Technologies DVB-S2 Business Model. The Challenge. Transmission costs (1.5-2M$ / 36 Mhz / Year) Increasing number of channels

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maximizing satellite transmission efficiency with dvb s2

Gidi Raz

Maximizing Satellite Transmission Efficiency With DVB-S2

agenda
Agenda
  • The Challenge
  • What is DVB-S2
  • DVB-S2 New Tools & Technologies
  • DVB-S2 Business Model
the challenge
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
so what do we need
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

DVB-S2

what is dvb s2
What is DVB-S2 ?
  • New DVB standard for digitial satellitecommunications
    • 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

short example
Short Example

Using 36Mhz transponder using different modulation and compression scheme

dvb s2 why the new system
DVB-S2 Why the new system?

2.5dB = 33% more useful data rate, or 2.5m Vs. 4.5m antenna

Shannon limit

DVB-S & DSNG

DVB-S2

2.5 dB margin gain

signal-to-noise ratio

slide8

DVB-S2 and Broadcast applications (DTH)

Typical 36MHz transponder usage with DVB-S and DVB-S2:

SATELLITE EIRP 51 dBW

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)

Symbol Rate

Roll-Off factor

Modulation

QPSK 2/3

QPSK 3/4

QPSK 7/8

8PSK 23

33.8 Mbps

46 Mbps (+36%)

44.4 Mbps

58.8 Mbps (+32%)

Bit rate

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 SD channels

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

dvb s2 system tools
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.
new modulation constellations
New Modulation Constellations

QPSK

2 bits/symbol

8PSK

3 bits/symbol

16APSK

4 bits/symbol

32APSK

5 bits/symbol

three operation mode
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
distribution of multiple ts multiplexes
Distribution of multiple TS multiplexes
  • DTT Transmitters
  • (Multiple TS, Constant Code Modulator - CCM)

DVB-S2 Modulator

QPSK

Rate 5/6

Mode adapter

DTT

MUX

1

1

SD

MERGER

Stream

Adapter

FEC

Coder

Mod

Transport Stream 1

SD

DTT

MUX

2

Transport Stream 2

2

SD

Constant Coding & Modulation

SD

distribution of multiple ts multiplexes1
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
Applications- SDTV and HDTV broadcasting

2. Differentiated channel protection

(Variable Code Modulation, Multiple TS - VCM)

DVB-S2 Modulator

QPSK

Rate 3/4

Mode adapter

MUX

1

1

SD

MERGER

Stream

Adapter

FEC

Coder

Mod

Transport Stream 1

SD

MUX

2

HD

Transport Stream 2

2

16 APSK

Rate 3/4

HD

applications
Applications

3. DSNG Services using ACM

(Single Transport Stream, information rate varying in time)

two examples
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)
summary
Summary

Take advantage of the new technology Mpeg4 / DVB-S2

Save at least 30% bandwidth / Money

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