Technology Advances. Ashaad Rambharos CSE Intelsat Africa

Transcription

1 Technology Advances Ashaad Rambharos CSE Intelsat Africa 1

2 Technologies Addressing your Bottom Line through the use of the latest technologies DVB-S2 Adaptive Coding and Modulation Carrier in Carrier MPEG 4 Video Encoding Multi Demodulator Hub Card 2

3 Addressing Your Bottom Line Through the Use of the Latest Technologies A new standard enables true convergence Excellent spectral efficiency: Up to 40% bandwidth saving compared to DVB-S Up to 2dB better than Turbo Codes HDTV enabler Unlike DVB-S, DVB-S2 is optimised for MPEG and IP 3

4 Value of ACM Addressing your Bottom Line through the use of the latest technologies Higher throughput for the same amount of resources When rain fade issues arise, the modulation can adjust so as to ensure the remote stays in the network Allows lower per Mbps price points to be achieved, leading to more competitive prices in the market Maximum achievable data throughput by utilizing the most efficient coding and modulation scheme at any moment in time, depending on location within the satellite contour, antenna size and atmospheric conditions 4

5 Carrier Cancellation: Comtech Double Talk Carrier-in-Carrier 8PSK A => B B => A Typical 8PSK Link Original Link shown for Reference QPSK A => B A => B 8PSK QPSK (Spreading) Bandwidth increases, Power decreases Composite Link QPSK - With DoubleTalk Carrier-in-Carrier Apply DoubleTalk Carrier-in-Carrier - Composite Carrier uses Less Bandwidth & Less Power Compared to Original 5

6 MPEG-4 Motion Pictures Experts Group A working group of ISO/TEC MPEG-2 and MPEG-4 are international standards for compressing video signals; they are widely used in digital television broadcasting, DVD discs, and mobile videophony Part 10 of MPEG-4, offers equivalent quality at half the MPEG-2 bitrate and is being quickly adopted by new services such as satellite delivery of American HDTV 6

7 Multi-Demodulator Cards Multiple inbound carriers in one return card Reduces cost of equipment Potential to pay as you grow with existing hardware (only software required) Easy manageability 7

8 Combination of Features Equipment Vendors are integrating options to their products DVB-S2 with ACM Satellite equipment vendors (eg. HNS, idirect, Shiron) Carrier in Carrier ComtechEFData CDM-625 Viasat PCMA DVB-S2, Carrier in Carrier with ACM ComtechEFData CDM-750 Hub demodulator card HNS, idirect etc 8

9 Technologies DVB-S2 Second Generation DVB Standard For Use In: Satellite news gathering IP packet transmission Data content distribution New Key Features Introduced New coding based upon LDPC Bandwidth optimization through use of VCM & ACM dynamic coding Allows routes to use the best possible coding for each site Coding Supported QPSK, 8PSK, 16APSK, 32APSK Backwards Compatible With DVB-S 9

10 Cost Benefit Characteristics Provides improved throughput during clear sky conditions by utilizing rain fade margin Keeps link closed during rain fade conditions Efficiency dependent upon location within the footprint Can Provide Significant Cost Savings Pricing as low as $1,400 - $1,500/Mbps SK & $850 - $950 IOO Costs decline further when implemented with C-n-C Customer Network in Nigeria Original service engineered for 39/12 Mbps Actual throughput was 65/32 Mbps No additional MHz used! 10

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12 Intelsat brings well known principles of Frequency Reuse & Spot Beams in a new configuration Frequency reuse (Any frequency band: C, Ku, Ka) + Spot Beams & Wide Beams = Intelsat Epic NG 12

13 Frequency Reuse Methodology CSE 1. Reduce beam size. This increases G/T and EIRP 2. Split frequency into 4 or 7 or 8 etc. segments or colors. 3. Assign each color the segmented bandwidth taking care not to assign any similar colors next to each other. 500 MHz 250 MHz 250 MHz 250 MHz 250 MHz 4 Color reuse 13

14 EpicNG uses Intelsat platform these principles to deliver the next generation CSE IS-29 has more than 5 GHz of Ku-Band bandwidth over South America Peak EIRP ~ 59.5 dbw Edge EIRP ~ 55.5 dbw Peak G/T ~ db/k Edge G/T ~ +7.5 db/k Beam bandwidth varies between MHz Denotes Gateway Location 14

15 Case 1: WiMAX Backhaul to Africa Using DVB-S2 Intelsat 8PSK 8/9 8.1 m C-band 4.5 m Service 1 Germany EL470 IP modem EL170 IP modulator (VCM) 8PSK 5/6 4.5m EL830 PEP-Box Terminal Service 1 8APSK 2/3 Service 2 Service 2 Service 3 EL970 IP demodulators 2.4 m Nigeria EL830 PEP-Box Terminal Service 3 EL840 PEP-Box Server Cluster EL830 PEP-Box Terminal 15

16 Case 1: WiMAX Backhaul to Africa Using DVB-S2 Combined bandwidth savings of 40 to 50 % True broadband experience for end-users DVB-S2 VCM Each service is encoded and modulated with its own set of parameters on the same carrier Additional compression at IP level Web sites open 3-4 times faster Time-sensitive applications are prioritized 16 16

17 Case 2: Point-to-Point DVB-S2 ACM Link Between Germany and Nigeria 15 Mbaud 18 MHz, Ku 7.5 Mbaud 9MHz, C Fuchsstadt 9m Intelsat 907 Lagos 4m EL470 IP modem EL470 IP modem Without ACM: Fixed 8PSK 9/10: 38/19Mbit/sec Losing service during heavy storms 17

18 Case 2: Point-to-Point Link Between Germany and Nigeria 100 % bandwidth savings 100 % Availability Severe Thunderstorm in Nigeria Most of the time running 32APSK 9/10 Duration: 10 minutes +70% compared to 8PSK 9/ % compared to DVB-S Service always available, even during severe weather conditions Signal to noise ratio 32APSK 9/10 actual required 16APSK 3/4 Time 18 18

19 Case 3: Inclined Orbit Satellite with FlexACM FlexACM can increase the average throughput tremendously, and very predictably 19

20 Comtech Double Talk Carrier-in- Carrier CRS-280 IF Switch 20

21 Questions Thank you 21