dab+ for local and community radio
DESCRIPTION
Presentation for Unikom radios in Switzerland on how to build a live transmission of DAB+ programs using low cost techniques.TRANSCRIPT
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OPENDIGITALRADIO.ORG
DAB/DAB+ for community radio
Unikom Meeting
Zurich
23rd October 2011
Mathias Coinchon
Stan Roehrich
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Plan of the presentation
DAB/DAB+ infrastructure Some figures for professional setup Software Defined Radio and Open tools Demonstration Discussion
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DAB+ infrastructure
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DAB/DAB+/DMB transmission infrastructure
Source:www.worlddab.org
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Infrastucture
Encoder: create the DAB+ HE-AAC audio stream Ensemble Multiplexer: Gather all the streams (+data) Modulator: Create the digital radio signal Amplifier: pump up the jam ;-) Mask Filter: to meet BAKOM spectrum requirements Antenna: radiate the jam + communication lines (STL) between studio,
multiplexer and transmitter sites
For single frequency network of many transmitters, add: GPS synchronisation clocks
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DAB+ professional setup
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Typical prices for professional equipment
Equipment Professional
DAB+ Encoder ~4000€
Transmission to operator Leased line:500-1500€/month
DAB multiplexer ~15’000€
Modulator ~10’000€
250 Watt effective amp ~20’000€
Mask Filter 1500-2500 €
Antenna 500 € (dipole) - 2000 € (panel)
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Typical price for professional sites
Investment: Small site (~500W) : ~ 50’000 € Big site (>1kW) : 120’000 € + accessories (mast, etc) + installation + engineering, bakom, ORNI/NIS
Running costs Rent, Electricity, Cooling
– Typical for an operator: 2000-10’000 Frs/month
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Professional solutions
High Investment&Operational costs (CAPEX/OPEX)– increase with the number sites and SFN
But division by the number of stations Finally turns out to be cheaper than FM for national or
big broadcasters
Often not affordable for local/community/non commercial broadcasters
Proprietary solutions Operator solution not easily scalable
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Digital radio broadcast, far too complex/costly for small radiosor experimenters ?
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It may not be the case anymore...
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Software defined radio
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Traditional approach of radio transmission/reception
Specific dedicated hardware Low volumes, high prices Limited flexibility Few possibilities of evolution
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Software Defined Radio (SDR) Principle
[ Your
code here ]
D/A converter
RF Frontend
Software (de-)modulation– Can run on a standard PC platform
Generic hardware– « Like a soundcard » but for radio waves
=> High flexibility, limited by CPU/Interface
Antenna
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PC platform nowadays
Powerful enough to perform live encoding, multiplexing and complex modulation (COFDM) on a single PC
High speed interfaces Incredibly low price considering the complexity and
processing power
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A great blackbox !
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Democratisation of Software Defined Radio
USRP: Universal Software Radio Peripheral– Open hardware solution sold by Ettus for 700$
– Schematics, FPGA code available to the public
– Can transmit or receive signals up to 15MHz BW
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USRP: Universal Software Radio Peripheral
Baseband complex samples (I/Q)
RF
RF
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What you can do with the USRP and a PC
FM RDS transmission and reception DAB/DAB+ transmission (CRC-mmbTools) DRM/DRM+ transmission/reception (Spark, Dream) DVB standards, possible but no open projects yet Local GSM Network (OpenBTS project) GPS receiver Aircraft beacon receiver Passive Radar DECT, RFID, Wifi, etc
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SDR projectsfor broadcasting
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DAB Software Radio
Developed by Communication Research Center (CRC), Canada– Francois Lefebvre, Pascal Charest
– First public demo at IBC2006
– Presented to WorldDMB TC, Eindhoven 09/2006
CRC-DABMUX: DAB/DAB+/DMB Multiplexer CRC-DABMOD: DAB Mode II OFDM modulator (no SFN) Other tools for slideshow, CELT, DAB+, etc Open sourced in 2009-2010 (GPL license)
http://mmbtools.crc.ca
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Opendigitalradio.org
Warning ! These tools are not turnkey solutions
Experimental
www.opendigitalradio.org: Document experimentations on
digital radio broadcasting using open tools and hardware techniques
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Spark
DRM/DRM+ encoder/multiplexer/modulator Not Free/Open but trial and licensed versions (windows) http://www.drm-sender.de
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Demo !Encoding, multiplexing, modulating, transmitting 12 DAB+ live programme
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Practical cases withDAB and CRC mmbtools
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Application: Performance at Label Suisse festival
Live local broadcasting of 8 DAB channels Audio from a video projection of 8 music bands playing First licensed DAB transmission fully open source
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Application: Performance at Label Suisse festival
DAB transmission by Maxxima Video projection by MXLab
More information on http://www.opendigitalradio.org
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Integrating open source blocks on Linux
JACKTOOLAME&C
RC ENCODERS
CRC-DABMUX
CRC-DABMOD
BASEBAND PLAYER
USRP
PCM MPEG
ETI
IQUSB
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Application: Multiplatform & Hybrid Radio demo
Generation of DAB (+Slideshow), FM RDS, DRM broadcast signals
FM+RadioDNS
DRM Slideshow DAB+RadioDNS
DAB Slideshow
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Application: EBU Multiplatform Hybrid demo at IBC
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DAB/DAB+ (and FM, DRM, streaming) in a box
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Hardware for local DAB/DAB+ transmission
10W ERP
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Application: The EBU demo at IBC 2010
Local DAB coverage at IBC DAB/DAB+ live and DMB pre-recorded Equipment for DAB transmission:
– PC: ~800€
– Linux, gnuradio, CRC-mmbTools: 0€
– USRP + RF frontend: 1150$ (~820€)
– Amplifier 35 Watts CW, 6W OFDM: ~ 150€
– VHF Mask Filter, 6 cavities: 1300 €
– VHF 5dB 3 elements Antenna: 300€
– Small equipment: 100€
– TOTAL: ~ 3500 €
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Under development
Higher power transmission for coverage of a city Temporary digital licence (Maxxima radio project)
600W (CW) class ABamplifier development(by Stan RoehrichMaxxima.org)
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Amateur radio DRM trial in Sottens using Spark
• 4.5kHz, Mode B, MSC 16QAM, EEP code rate 0.5, AAC audio at 4.8kbit/s
• 4.5kHz, Mode B, MSC 64QAM, EEP code rate 0.5, AAC Audio, MOT Slideshow at 2.56 kbits/s
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Great, I want to build my digital radio bouquet over my city tomorrow !
How to ?
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Possibilities for realDAB+ local Ensemble
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Software Defined Radio benefits
SDR lower the costs by shifting to generic hardware Enable flexible multiplatform transmission (and reception) Still experimental but this could change rapidly...
$$$$$$$$$
$$
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Implications in the longer term
Digital Broadcasting transmission gets democratized Enabling innovation, local broadcasting, etc Lowering costs
What do commercial solutions offer then ? Turnkey solutions Quality hardware for RF transmission (amplification, etc) Service and support Sophistication (user interface, special features)
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Some examples from the past
FM– Used for broadcasting since 1955
– Democratisation in the eighties => community radio explosion (many of them became today’s big private radio groups)
Audio– From separate instruments/effects to software plugins
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Reality
Experimental, THIS IS NOT A TURNKEY SOLUTIONFurther work needed to test it 24/24, improve toolsNo SFN solution
Mixed solutions with professional equipment possible – Total DAB in Ireland: CRC MUX + pro. modulator/amp
– Kanal Plus in Denmark: CRC MUX and MOD, pro amp
Costs are divided by the number of participants in a mux. Public/private digital radio:
Big networks (many transmitters), SFNHigh availability redundant systems => expensive
Community radio:LocalCan live with lower reliability (as for streaming)
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Example of figures (estimation !)
Equipment Professional Open/SDR approach
DAB+ Encoder ~4000€ 500€ or 2000€ unlimited number of programs
Transmission to operator Leased line:500-1500€/month
Internet stream50-100€/month
DAB multiplexer ~15’000€ Free (E1 card for pro. modulator: 1000€)
Modulator ~10’000€ Free, USRP set: 1500$
1 kiloWatt effective amp ~20’000€ = (Not done yet)
Mask Filter 1500-2500 € = (Not done yet)
3 elements antenna 500 € (dipole) - 2000 € (panel)
Plumbing costs ;-)
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Conclusion
We believe Digital Radio is now possible for local, community stations (technically)
Creation of small digital islands instead of big regional coverages
We have not spoken of political aspects License, Spectrum access Market regulation, competition
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Are you ready ?