Presentation is loading. Please wait.

Presentation is loading. Please wait.

Maximizing Satellite Transmission Efficiency With DVB-S2 Gidi Raz.

Similar presentations


Presentation on theme: "Maximizing Satellite Transmission Efficiency With DVB-S2 Gidi Raz."— Presentation transcript:

1 Maximizing Satellite Transmission Efficiency With DVB-S2 Gidi Raz

2 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

3 3 Scopus information not to be disclosed or reprinted without Scopus prior written permission 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

4 4 Scopus information not to be disclosed or reprinted without Scopus prior written permission  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?

5 5 Scopus information not to be disclosed or reprinted without Scopus prior written permission 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

6 6 Scopus information not to be disclosed or reprinted without Scopus prior written permission Short Example Using 36Mhz transponder using different modulation and compression scheme

7 7 Scopus information not to be disclosed or reprinted without Scopus prior written permission DVB-S2 Applications  Broadcast Services- digital multi-programme Television (TV) / High Definition Television (HDTV) broadcasting services to be used for primary and secondary distribution in Fixed Satellite Service (FSS) and Broadcast Satellite Service (BSS) bands. (Including compatibility to MPEG-4)  Digital TV Contribution and Satellite News Gathering (DTVC/DSNG)  Interactive Services- Interactive data services including Internet access (only the forward broadband channel)  Data content distribution/trunking and other professional applications (only the forward broadband channel)

8 8 Scopus information not to be disclosed or reprinted without Scopus prior written permission DVB-S2 Why the new system? 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

9 9 Scopus information not to be disclosed or reprinted without Scopus prior written permission DVB-S2 and Broadcast applications (DTH) 13 SDTV MPEG2 26 SDTV h SDTV MPEG2 20 SDTV h SDTV MPEG2 21 SDTV h SDTV MPEG2 15 SDTV h HD MPEG2 6 HD h HD MPEG2 5 HD h HD MPEG2 5 HD h HD MPEG2 3 HD h Mbps (+32%)44.4 Mbps46 Mbps (+36%)33.8 Mbps 8PSK 23QPSK 7/8QPSK 3/4QPSK 2/ 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

10 10 Scopus information not to be disclosed or reprinted without Scopus prior written permission 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.

11 11 Scopus information not to be disclosed or reprinted without Scopus prior written permission Three Spectrum Shapes 20%

12 12 Scopus information not to be disclosed or reprinted without Scopus prior written permission DVB-S2 Modes and Options  DVB-S2 3 standards in one:  Non Backward Compatible Broadcast  Backward Compatible Mode  Adaptive Coding and Modulation Option

13 13 Scopus information not to be disclosed or reprinted without Scopus prior written permission Non Backward Compatible  NBC Mode – Taking advantage of all S2 Capabilities  Specifies QPSK, 8PSK, 16APSK and 32APSK constellations  Uses a LDPC Block code (64kbit block size)  16 kbit block size as an option – for low delay mode  Coding performance within 1dB of Shannon limit  Many code rates from ¼ to 9 / 10

14 14 Scopus information not to be disclosed or reprinted without Scopus prior written permission BCM - Backwards Compatible Mode Non-uniform 8PSK constellation Hierarchical QPSK Sending, on a single Satellite channel, two Transport Streams - Hierarchical QPSK HP (High Priority) DVB-S (QPSK) – modulate for DVB-S LP (Low Priority) DVB-S2 (BPSK) ) – modulate for DVB-S2 Example: At QPSK ¾ it can add up to 17Mbps for new programs in DVB-S2. (36Mhz TP)

15 15 Scopus information not to be disclosed or reprinted without Scopus prior written permission Variable & Adaptive Coding/Modulation  Option within the standard – not implemented yet  For interactive and one-to-one applications making use of return channels to provide the exact channel protection  Coding and Modulation can change on an FEC block basis  Mode is signalled by a header added to the front of each FEC block

16 16 Scopus information not to be disclosed or reprinted without Scopus prior written permission New Modulation Constellations QPSK 2 bits/symbol 8PSK 3 bits/symbol 16APSK 4 bits/symbol 32APSK 5 bits/symbol

17 17 Scopus information not to be disclosed or reprinted without Scopus prior written permission Comparison of DVB-S2 and DVB-S SubjectDVB-SDVB-DSNGDVB-S2 FECReed-Solomon & Viterbi LDPC FEC rates0.46 – FEC Performance2-2.5 dB better ModulationBPSK, QPSKQPSK,8PSK,16QAMQPSK,8PSK,16APSK,32AP SK Max Spectral Efficiency Block size~ 32Kbit 64Kbit, 16Kbit Roll-off , , 0.25, 0.20 CCM/VCM/ACMCCM VCM/ACM (for IP data) Implementation Complexity LowMediumVery High Stream adaptationMPEG MPEG & programmable

18 18 Scopus information not to be disclosed or reprinted without Scopus prior written permission 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

19 19 Scopus information not to be disclosed or reprinted without Scopus prior written permission Distribution of multiple TS multiplexes 1.DTT Transmitters (Multiple TS, Constant Code Modulator - CCM) DTT MUX 1 DTT MUX 2 Transport Stream 1 Transport Stream MERGERMERGER Stream Adapter FEC Coder Mod QPSK Rate 5/6 Constant Coding & Modulation Mode adapter DVB-S2 Modulator SD

20 20 Scopus information not to be disclosed or reprinted without Scopus prior written permission 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

21 21 Scopus information not to be disclosed or reprinted without Scopus prior written permission Applications- SDTV and HDTV broadcasting 2. Differentiated channel protection (Variable Code Modulation, Multiple TS - VCM) MUX 1 MUX 2 Transport Stream 1 Transport Stream MERGERMERGER Stream Adapter FEC Coder Mod QPSK Rate 3/4 16 APSK Rate 3/4 Mode adapter DVB-S2 Modulator SD HD

22 22 Scopus information not to be disclosed or reprinted without Scopus prior written permission Applications ACM 3. DSNG Services using ACM (Single Transport Stream, information rate varying in time)

23 23 Scopus information not to be disclosed or reprinted without Scopus prior written permission No ACM /VCM

24 24 Scopus information not to be disclosed or reprinted without Scopus prior written permission With ACM and VCM

25 25 Scopus information not to be disclosed or reprinted without Scopus prior written permission Business Models

26 26 Scopus information not to be disclosed or reprinted without Scopus prior written permission 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 Mhz  DBV-S2: QPSK 9/10, with roll off factor of 0.2 requires Mhz  Total bandwidth saving of 30%  Total cost saving is $620,000 a year (ROI 5 Months)

27 27 Scopus information not to be disclosed or reprinted without Scopus prior written permission Business Model - Contribution

28 28 Scopus information not to be disclosed or reprinted without Scopus prior written permission Business Model - Distribution

29 29 Scopus information not to be disclosed or reprinted without Scopus prior written permission Summary Take advantage of the new technology Mpeg4 / DVB-S2 Save at least 30% bandwidth / Money

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


Download ppt "Maximizing Satellite Transmission Efficiency With DVB-S2 Gidi Raz."

Similar presentations


Ads by Google