DIGITAL RADIO GUIDE

APPENDIX A: EUREKA 147

TPEG can be transported within the DAB system in the Transparent Data Channel (TDC) in a stream-like format; bytes come out in the same order they go in.29 The TDC Specification allows TPEG data to be carried in three modes: packet mode, stream mode and X-PAD. Nevertheless, this approach which is specified in the present version of the DAB standard, involves several problems in terms of reception reliability and interpretation. It has therefore been proposed to transport TPEG as one of the multimedia applications in the MOT data channel. This would imply the following main advantages: MOT is already implemented in most receivers and enables efficient object compression, power saving and delta updates and has much lower overhead than TDC.

Advanced demodulation technique for COFDM

The Communications Research Centre Canada (CRC) developed an advanced COFDM demodulation technique30 which reduces the effect of the Doppler effect and therefore increases the maximum speed, allowing vehicle speeds up to 140 km/s while achieving a target bit error rate (BER) of 10-4 . Canadian DAB broadcasters use L-Band (1452 to 1492 MHz) and would like to use Transmission Mode IV instead of Mode II, because the former allows for a larger separation distance between on-channel re-transmitters than in the case of Mode II. However, Mode IV in L-Band limits the speed to less than 100 km/h, so this new technique could help. Further studies are required to investigate whether this technique could be useful for VHF bands and whether the chip manufacturers could accommodate it readily into their chip design.

Technical Standards

International Standards

ETSI Standards31

Eureka 147 standards are formalised by ETSI and are available for download. The current list of ETSI standards relating to Eureka 147 are in Table A.3. The main ETSI standard for Eureka 147 is EN 300 401.

 

Table A.3: ETSI Standards relating to Eureka 147

 

 

Number

Title

EN 300 401 V1.3.3

Digital Audio Broadcasting (DAB); DAB to mobile, portable and fixed

(May 2001)

receivers

 

(THIRD EDITION)

EN 300 797 V1.1.1

Digital Audio Broadcasting (DAB); Distribution interfaces; Service

 

Transport Interface (STI)

 

 

EN 300 798 V1.1.1

Digital Audio Broadcasting (DAB); Distribution interfaces; Digital

 

baseband In-phase and Quadrature (DIQ) Interface

 

 

EN 301 234 V1.2.1

Digital Audio Broadcasting (DAB); Multimedia Object Transfer (MOT)

 

protocol

 

 

EN 301 700 V1.1.1

Digital Audio Broadcasting (DAB); Service Referencing from FM-RDS;

 

 

29Guidelines for TPEG in DAB, B/TPEG Plenary Group 00/113 available from www.ebu.ch/bmc_btpeg.htm

30Thibault, Zhang, Boudreau, Taylor, Chouinard: Advanced Demodulation Technique for COFDM in Fast Fading Channels, IBC 2003 Proceedings, p. 416 to 422

31EBU BPN 062

107

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Grundig Digital Radio Advanced demodulation technique for Cofdm, Table A.3 Etsi Standards relating to Eureka, Number Title

Digital Radio specifications

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Portability is another key characteristic of the Grundig Digital Radio. Many models are lightweight and come with built-in handles, making them ideal for on-the-go listening, whether it's in the garden, on the beach, or during a picnic. Battery options, alongside mains power, ensure that users can take advantage of their radios wherever they choose.

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