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]

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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

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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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4-QAM 16-QAM

Datenrate [kbit/s]

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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

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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