Digital terrestrial sound and multimedia broadcasting system for VHF frequency bands RAVIS

1. Digital terrestrial sound and
multimedia broadcasting system
for VHF frequency bands
RAVIS
(Real-time AudioVisual
Information System)
Hannover Messe, 8-12 April 2013

2. • Increasing efficiency (more than 10 times) of VHF frequency range
utilization
• Higher quality of sound broadcasting, introduction of new
multimedia services, including video
• Implementation of local announcement system
• Substantial decrease in energy consumption for broadcasting
• Build-up of united system of mobile broadcasting preserving
existing frequency arrangements
• Build-up of local TV and radio broadcasting in small towns and rural
areas, possibility of operation without multiplex
• Integration of RAVIS into international telecommunications,
interconnection with other radio broadcasting standards
Characteristic features of RAVIS
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3. Single radio channel RAVIS :
10 - 20 stereo sound programs or
up to 8 multichannel (5.1) sound programs or
video program and up to 6 stereo sound programs
Increase of spectrum efficiency
in VHF range
3
OIRT FM International FM
RAVIS RAVIS
20
radio
programs
50
radio
programs
40
radio
channels
(200 kHz)
100
radio
channels
(200 kHz)
66 MHz 74 MHz
66 MHz 74 MHz 87.5 MHz 108 MHz
87.5 MHz 108 MHz
Hannover Messe, 8-12 April 2013

4. • For listeners:
• High quality sound broadcasting (stereo and multichannel)
• New multimedia services – video, text, additional data, EPG, etc.
• Easy tuning on the station by station name, program genre and so on
• For manufacturers:
• Mass replacement of old analogue receivers
• Upgrade of transmitters
• General growth of the market potential
• For broadcasters:
• Decrease in power consumption and expansion of coverage area
• Increased quantity and quality of programs and services
• Adaptation to the needs of both big and small broadcasters
• For regulatory authorities:
• Increase in spectrum usage efficiency
• Preservation of existing frequency allocations
• Coordination in the framework of the internationally recognized system
Advantages of RAVIS
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5. • Several high quality stereo and multichannel
sound programs
• Video programs with multilingual sound
accompaniment
• Text messages
• Electronic program guide
• Static images, slide-show
• Public warning in emergency situations, data
transmission with enhanced reliability
• Traffic information, local weather forecast, etc.
• Data transmission (broadcast, multicast,
unicast)
• Service following, compliant with other
broadcasting systems
New services in RAVIS
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6. • VHF bands I and II
(41-68/74 MHz and 87.5-108 MHz – FM broadcasting
bands)
• Radio channel bandwidth 100, 200 or 250 kHz
(fits to current frequency arrangements)
• Capacity – 80-900 kbps
• Stable reception in moving vehicles in urban districts
with compact planning, in woody and mountainous
areas, in water areas
• Operation in multipath environment, absence of line-of-
site transmitting antenna
RAVIS general parameters
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7. 7
Examples of configurations of
RAVIS parameters and services
• Radio channel bandwidth 250 kHz, 64-QAM, FEC rate 3/4 –
high data bitrate (900 kbps):
• Video program with two stereo sound accompaniment channels (English,
Russian) – 700 kbps,
• Music program (5.1 multichannel sound) – 84 kbps,
• Three stereo sound programs – 32*3 = 96 kbps,
• Additional data – 20 kbps
• Radio channel bandwidth 200 kHz, 16-QAM, FEC rate 2/3 –
medium data bitrate, large coverage area (410 kbps):
• Video program with stereo sound accompaniment – 360 kbps,
• Stereo sound program – 32 kbps,
• Additional data – 18 kbps
• Radio channel bandwidth 100 kHz, QPSK, FEC rate 1/2 –
low data bitrate, huge coverage area (80 kbps):
• Two stereo sound programs – 32*2 = 64 kbps,
• Additional data – 16 kbps
Hannover Messe, 8-12 April 2013

8. 8
Standardization of RAVIS
• Russian Federation national standard GOST R 54309-2011 “Realtime
audiovisual information system (RAVIS). Framing structure, channel
coding and modulating for digital terrestrial narrowband
broadcasting system for the VHF band. Technical specification”
• Report ITU-R BT.2049-4 “Broadcasting of multimedia and data
applications for mobile reception” (10/2010)
• Report ITU-R BS.2214 “Planning parameters for terrestrial digital
sound broadcasting systems in VHF bands” (05/2011)
• ECC Report 117 “Managing the Transition to Digital Sound
Broadcasting in the Frequency Bands below 80 MHz” (09/2010)
• ECC Report 141 “Future Possibilities for the Digitalisation of Band II
(87.5-108 MHz)” (05/2010), Technical supplement (04/2012)
• ECC Report 177 “Possibilities for Future Terrestrial Delivery of Audio
Broadcasting Services” (04/2012)
Hannover Messe, 8-12 April 2013

9. RAVIS spectrum masks,
fits to FM spectrum mask
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10. RAVIS hardware kit
1. Video Encoder
2. Audio Encoder
3. Public Warning
Encoder
4. Multiplexer
5. Modulator
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11. RAVIS power amplifiers 100 W, 500 W
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12. RAVIS test receivers
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13. 13
RAVIS signal parameters
Parameter Value
Modulation OFDM
FEC rate (MSC channel) 1/2, 2/3, 3/4
Modulation of carriers (MSC channel) QPSK, 16-QAM, 64-QAM
Radio channel bandwidth [kHz] 100 200 250
Data bitrate (MSC channel only) [kbps] 80 - 350 160 - 710 200 - 900
Number of carriers 215 439 553
Number of data carriers 196 400 504
Distance between edge carriers [kHz] 95,1 194,7 245,3
Carrier spacing [Hz] 4000/9 = 444 + 4/9
Duration of OFDM symbol useful part [μs] 2250
Duration of guard interval [μs] 281,25 (1/8)
Duration of OFDM symbol [μs] 2531,25
Duration of OFDM frame [ms] 103,8 (41 symbol)
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14. 14
Logical data channels
MSC, LBC and RDC
MSC – main service channel
• sound, video, text, traffic info, etc.
LBC – low bitrate channel
• enhanced transmission reliability
• audio announcement
RDC – reliable data channel
• high transmission reliability
• text announcement, telemetry
Parameter MSC LBC RDC
Modulation OFDM
FEC rate 1/2, 2/3, 3/4 1/2
Modulation of carriers QPSK, 16-QAM,
64-QAM
QPSK BPSK
Data bitrate [kbps] 52 - 900 12 5
Number of data carriers 138 - 504 32 26
LBC and RDC channels may be
turned on/off independently
LBC, RDC carriers are used for MSC
channel if LBC, RDC channels are
turned off
Hannover Messe, 8-12 April 2013

15. 15
Main Service Channel (MSC) data rates
Constellation
type
FEC rate
Data bitrate [kbps]
100 kHz radio
channel
200 kHz radio
channel
250 kHz radio
channel
QPSK
1/2 80 160 200
2/3 100 210 270
3/4 120 240 300
16-QAM
1/2 150 320 400
2/3 210 420 530
3/4 230 470 600
64-QAM
1/2 230 470 600
2/3 310 630 800
3/4 350 710 900
Hannover Messe, 8-12 April 2013

16. RAVIS performance:
AWGN, rural and urban environment
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17. Field tests of RAVIS broadcasting
in Moscow and Sochi
17
16-QAM
Hannover Messe, 8-12 April 2013

18. 300 kbps, 360x200, 25 fps
RAVIS: video program
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19. 500 kbps, 640х360, 25 fps
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RAVIS: video program

20. 500 kbps, 640х360, 25 fps
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RAVIS: video program

21. 32 kbps, QCIF, 12 fps 64 kbps, CIF, 12 fps
128 kbps, CIF, 12 fps 256 kbps, CIF, 25 fps
Quality of video for various bitrates
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22. CD quality of stereo sound
coded at bitrate 32 kbps (HE-AAC)
(uncoded audio bitrate – 1411 kbps)
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23. Research & Development Company
SAD-COM Ltd.
24A, 7 Parkovaya str.,
105264, Moscow, Russian Federation
Tel.: +7 495 7481863
E-mail: dvp@ravis-radio.ru
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