drmplus presentation v1.5
DESCRIPTION
DRM plus technologyTRANSCRIPT
DRM+Digital Radio Mondiale
DRM with the additional “+” is the extension of DRM to all
broadcasting bands up to 108 MHz
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DRM+FM 1 FM 2
Contents
For further information see www.drm.org
A. DRM+ for BroadcastersB. System OverviewC. Service Information,
Data ApplicationsD. Transmission SignalE. Field Trials
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18040 60 80 100 120 140 160
4-QAM 16-QAM
Datenrate [kbit/s]
Cod
erat
e
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A. DRM+ for Broadcasters
• DRM+ supports small and medium broadcasters – Small coverage areas with simple single station– Power efficient system– No complex multiplex structure,
e.g. single service per frequency possible
• DRM+ supports huge broadcasters– Huge coverage areas with SFNs (single frequency networks)– Heterogeneous networks with
service following to DRM, DAB, FM and AM– Up to 4 Services in one multiplex (audio and/or data)
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A. DRM+ for Broadcasters
DRM+ has a strong basis
• DRM+ will be an open worldwide standard• DRM+ is supported by a strong consortium
– Broadcaster, network providers, regulatory bodies, research institutes and manufacturers
– 105 Members from 34 countries (02/08)• DRM+ draft system specification available
– Field tests are ongoing– Standardisation planned at ITU/ETSI
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B. System Overview
• Robust OFDM transmission system– Mobile reception also in multipath environments
• Narrow bandwidth of 100 kHz– Transmissions also in small spectral gaps
• Huge range of data rates from 37-186 kbit/s– Flexibility in number of services and content
• Different modulations and code rates– Perfect trade-off between data rate and transmission power
• Audio coding with MPEG Surround – Efficient coding for stereo-compatible 5.1 multichannel
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B. System Overview
• Robust transmission system based on OFDM – Supports vehicle speed up to 300 km/h– Supports long echoes in SFNs
(single frequency networks)• Same multiplex structure and signalling as DRM
– Easy and fast extension to DRM receiver developers
M u x
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C e ll in te r le a v e r
O F D Mc e ll
m a p p e r
O F D Mg e n e ra to r
R e fe re n c e p i lo ts fo r sy n c h ro n is a tio n a n d c h a n n e l e s tim a tio n
A u d io
D a ta
FA C FA Cg e n e ra to r
C h a n n e l-e n c o d e r
C h a n n e l-e n c o d e r (M L C )
M a p p in g4 -Q A M
P re -e n c o d e r
S D CS D C
g e n e ra to r
M a p p in g4 -Q A M
C h a n n e l-e n c o d e r
S o u rc e -e n c o d e r
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B. System Overview
• Huge range in possible data rate: 37–186 kbit/s– Easy adaptation to broadcasters content
• Use of different code rates and constellations– Easy adaptation to coverage area and transmission power
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18040 60 80 100 120 140 160
4-QAM 16-QAM
Datenrate [kbit/s]
Cod
erat
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data rate [kbit/s]
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B. System Overview
• Flexible multiplex– 1 to 4 Services within one multiplex– Audio and Data Services,
including PAD (Programme Associated Data)– Fine granularity adaptation in data rate between Services– Dynamic reconfiguration feature
Audio Service 1 Data 1
Example 1: Audio (2 x 64 kbit/s), Data/speech (2 x 24 kbit/s)
Data 1
Example 2: Data transmission (180 kbit/s and 6 kbit/s)
Audio Service 2 Data 2
Data 2
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B. System Overview
• Audio coding with MPEG-4 HE-AAC v.2provides up to CD like sound quality(High Efficiency Advanced Audio Coding)
• 5.1 multichannel audio with MPEG Surround– Mono/stereo receivers are fully compatible
with MPEG Surround signal– Surround spatial information embedded as
narrow bit rate channel in audio stream
LRCRLRR
Front LeftFront RightCenterRear LeftRear Right
HE-AACdecoder
MPEG Surround decoder
(optional)surroundspatial
information
Stereo LeftStereo Rightcoded audio
(mono/stereo)
HE-AACencoder
MPEG Surround encoder
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C. Service Information
• DRM+ supports different kinds of Service Information:
– Service Label(UTF-8: all international character sets)
– Programme Type, Language, Country of origin– Time / Date
(UTC + local time offset)
– Text Messages application– Announcements for traffic, news, weather
– Warning / Alert signalling(incl. automatic receiver switching)
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C. Service Information
• DRM+ supports heterogeneous station network– AFS – Alternative Frequency Signalling
incl. constant background checking– Service Following
91.3 MHz DRM+ 1422 KHz DRM
91.3 MHz DRM+5B DAB5B DAB
5B DAB
549 KHz DRM
98.3 FM-RDS89.1 FM-RDS
DRM on 91.3 and DAB in 5Boperating in SFN(Single Frequency Mode)
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C. Data Applications
• Support for– DRM standardized applications– DAB standardized applications– Transmission of individual data
(IP encapsulation, transparent file transmission, TDC, etc.)
• Stream- and Packet Mode transmissionsincluding “Enhanced Packet Mode” with stronger FEC
• Service Signalling as– PAD belonging to an Audio Service
(Program Associated Data)– Stand-alone Data Service
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Examples of standardized applications:
• DRM TextMessagesprogramme accompanying labels
• EPG – Electronic Program Guide
• Journaline®
teletext-like interactive information service,supporting all classes of receivers
• TMC / TPEGTraffic and travel information
• MOT Slideshowprogramme accompanying images
C. Data Applications
Listening to: Pete I…
Morning Show – the g…
XMLXMLXMLXMLRSSRSSRSSRSS
RealTimeRSS
RealTime
RealTime
RealTime
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D. Transmission Signal
• Open standardized interfaces for contribution and distribution Interoperability of equipment from different manufacturers
D R MM ultip lex
D R MM odu la to r
D R MM odu la to r
Broadcast Reception
m odu la teds igna l
R F F ron te nd
D R M D e m o dula tor
D R MM ultip lex
D R MTransm iss ion
,S igna l on the a ir‘
con tro l/con fig
con fig(X M L)
*possible use of protocol
data / aud io
m odu la teds igna l
s ta tus/con tro l
MDI/DCPMDI/DCP
*M DI/DCP
*M DI/DCP
TMD/SNMPTMD/
SNM P
SDI/DCPSDI/DCP
RSCI/DCPRSCI/DCP
C o nten t P rov ide r (S tudio )
encodedaud io / da ta
S C E ncS C E nc
aud io / da ta
D R M M ultip lexe r
#DRM M ultip lex: M SC s…FAC, SD C ,
tream s 0–3,
S C D ec S C D ec
D R M D em u ltip lexe r
D R M D ecoder
encodeddata / aud io
SCE nc: ServiceCom ponent Encoder SCD ec: ServiceC om ponent D ecoder
con figASDI/DCPASDI/DCP
m onito ring/a rch iv in g
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D. Transmission Signal
• RF channel bandwidth of 96 kHz, nominal 100 kHz– The narrow bandwidth of DRM+ allows the insertion in
small frequency gaps• Frequency range up to 108 MHz including
– Curr. analogue TV Band I (47MHz to 68MHz)– OIRT FM band (65.8MHz to 74MHz)– Japanese FM band (76MHz to 90MHz)– FM Band II (87.5MHz to 107.9MHz)
96 kHz
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D. Transmission Signal
• Flexibility for combined FM / DRM+ transmissions– Power and frequency of DRM+ frequency block
can be planned in dependency of spectrum occupancy• Usage Examples of DRM+ frequency block with FM:
– Station FM1 can extend its broadcast via DRM+ with up to 4 Services,optionally multi-casting the FM1 program in DRM+
– Stations FM1 and FM2 efficiently share a joint DRM+ frequency block– In any case the DRM+ frequency block can flexibly be located
anywhere in the spectrum –Seamless FM/DRM switching is provided by receivers on service layer
DRM+
frequency
FM 1 FM 2
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E. Field Trials
• Field trials in Kaiserslautern at 87,6 MHz– Analyse coverage area– Tests of transmitter and receiver equipment– Analyse protection rations between FM and DRM+– Protection of emergency radio services and aircraft radio
• Further information: www.fh-kl.de/~drm/
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E. Field Trials
• Field trials in Hanover at 95,2 MHz– Field strength measurements– Verification of technical DRM+ parameters– Comparison between FM and DRM+
coverage area
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Summary – DRM+ in Brief
• DRM+ is being developed by a worldwide consortiumand will be standardised under ITU and ETSI rules in 2009 DRM+ will be an open, freely available international standard
• DRM+ offers a considerable choice of data services,including digital traffic information,and extended signaling features like Traffic/News/Whether Announcements, AFS, and Warning/Alert notifications
• DRM+ offers the certitude to regional and local broadcastersto take part in the digitalisation of radio
• DRM+ is suitable for the digitalisationof the FM frequency band
• DRM+ as an additional resource to the DAB/DAB+/DMB/DRMfamily broadcast standards, and eases the developmentof a migration strategy particularly for local and regional layers
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Summary – Implementation of DRM+
• The implementation of DRM+ as an additional digital radio platform can be foreseen as of 2009
- in Europe in addition to Eureka 147 (DAB+ in Band III) for regional and local coverage
- in countries without considering DAB/DAB+ as a primary replacement of the FM platform
www.drm.org