Digital Radio Mondiale: Technical Update. Lindsay Cornell Principal Systems Architect BBC
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1 Digital Radio Mondiale: Technical Update Lindsay Cornell Principal Systems Architect BBC 1
2 Topics Standardisation Receiver profiles ITU activity Field work and test results Conclusions 2
3 Key features of DRM Worldwide open standard Simple to use receivers Better audio quality Multimedia applications 3
4 Standardisation 4
5 ETSI standards DRM System Specification, ETSI ES revised to V3.1.1 includes the additional robustness mode for DRM+ includes surround sound support for all modes Final drafts being agreed to add DRM+ capability to distribution and monitoring interfaces, MDI and RSCI 5
6 DRM Receiver Profiles 6
7 Benefits of receiver profiles For broadcasters: planned services can be consistently and reliably received For manufacturers: product investments are supported by services For consumers: receivers will be fit for purpose and fulfil expectations and provide a consistent high quality experience For regulators: harmonised digital radio broadcasting strategies and policies can be developed and promoted 7
8 Process to establish profiles Working Group established Scope and Terms of Reference agreed Stakeholder consultation Evaluation and formulation of profiles Work built on the established World DMB Receiver Profiles Approval by DRM Steering Board Profiles announced at IBC
9 Structure of profiles Standard Receiver Recommended Features Mandatory Features Rich media Receiver DRM System Specification ETSI ES
10 Profile 1: Standard Radio Audio receiver with at least a basic alphanumeric display Must receive DRM in the MF, HF and FM bands with other bands recommended Essential elements to receive DRM radio Low target price 10
11 Profile 2: Rich Media Radio Audio receiver with a colour screen display of at least 320 x 240 pixels All the functionality of Profile 1 Display of EPG, SildeShow images, etc. 11
12 ITU Activity 12
13 DRM in 26 MHz band Preliminary Draft New Report ITU-R BS.[DRM26LOCAL] prepared from input Documents 6A/227 (Italy), 240 (EBU) and 260 (DRM Consortium) Provides frequency planning scenarios and results from trials Responds to Question ITU-R 127/6 - Mitigation techniques required for the use of digital modulation in the 26 MHz broadcasting band for local coverage PDN Report attached to WP6A Chairman s Report as Document 6A/TEMP/134 13
14 Recommendation ITU-R BS.1615 ITU-R BS Planning parameters for digital sound broadcasting at frequencies below 30 MHz Provides planning parameters for DRM30 with RF bandwidths up to 10 khz Additional planning parameters required for wide bandwidth dt modes (18 and 20 khz) for use in the MF and 26 MHz bands Original method for calculation of DRM protection ratios no longer available Administrations encouraged to consider proposed methodology which modifies original calculated values by applying changes to spectrum mask 14
15 Recommendation ITU-R BS.1114 ITU-R BS.1114 Systems for terrestrial digital sound broadcasting to vehicular, portable and fixed receivers in the frequency range MHz Currently recommends three systems: Digital System A Eureka 147 (DAB) Digital System C IBOC (HDRadio) Digital System F ISDB-T Proposal to add Digital System G DRM+ Preliminary draft revision (ITU-R WP6A/TEMP/136) requires more test data To be reviewed in April
16 DRM in VHF Band I EBU contribution in Document 6A/240 describes opportunities for digital sound broadcasting services in VHF Band I Document notes both DRM+ and DRM30 have been successfully tested in VHF Band I Identifies situation in VHF Band I in ITU Region 1 Working Party 6A has prepared Document 6A/TEMP/138 for further consideration 16
17 Other ITU Documentation Report ITU-R BS.2144 Planning parameters and coverage for Digital Radio Mondiale (DRM) broadcasting at frequencies below 30 MHz Explains why and how a broadcaster might go digital Is a reference technical document for DRM planning Provides new information based on the practical experience in DRM 17
18 Field work and test results 18
19 DRM+ field studies First DRM+ transmission in Hannover in 2007 Compatibility testing with FM-radio, aircraft and emergency services Protection ratio measurements for FM disturbed by DRM+ Transmit delay diversity and SFN field trials Mobile reception and coverage measurements Cross-compliance of Tx / Rx hardware 19
20 Simulation results 20
21 DRM+ field test results 21
22 DRM+ System Evaluation Baseband cross compliance tests Successfully finished Fraunhofer, Bosch, FH Kaiserslautern, Analog Devices, RFmondial, LUH Field edtests with low power TX (<100W) Promising results from Hannover and Kaiserslautern Coverage and coverage reliability increased compared to FM No impact on other systems (FM, flight security, emergency) Higher resistance to interference Further testing and studies currently ongoing Planning parameters in developmentelopment 22
23 Status of DRM+ in the field Europe Germany: Ongoing field trials (Kaiserslautern, Hannover) France: Field trial in Band I in Paris in July 2009 Italy: Preparing field trial in Band I & II in combined mode Brazil Governmental high power (~3 3.5kW) field trial currently ongoing in Sao Paolo Russia Governmental study analyzing and testing DRM+ (OIRT/Band II) Further inquiries for Band I and Band II China, Canada, Chile, Korea, Ukraine, India, Luxemburg, Australia, Norway, 23
24 Conclusions 24
25 DRM is technically complete Standardisation finished (save for interfaces) Receiver Profiles published ITU recommendations on course DRM+ evaluation successful Equipment available 25
26 Thank you More information from:
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