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Article-1_11-2018

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ORGANIZATION OF SINGLE FREQUENCY DRM DIGITAL RADIO BROADCASTING NETWORKS.
FEATURES AND RESULTS OF PRACTICAL TESTS

Oleg V. Varlamov, MTUCI, Moscow, Russia, vov@mtuci.ru

Abstract
The Digital Radio Mondiale (DRM) digital broadcasting standard is the only one approved by ITU for worldwide use in the frequency range below 30 MHz. The DRM digital broadcasting system allows the most economical servicing of sparsely populated and remote regions with no telecommunications infrastructure. The DRM standard provides for the possibility of using single-frequency synchronous radio networks. Their use with correct frequency-territorial planning allows to increase the efficiency of DRM broadcasting, and provides economy of frequency resource. The construction of single-frequency DRM synchronous networks in general differs from the scheme of DVB-T/DVB-T2 synchronous digital television networks or DAB/DAB + VHF digital broadcasting networks due to the presence of ionospheric propagation of radio waves. In this article, these features are considered and a technique for calculating the synchronism zone is proposed. Consideration of possible scenarios for the placement of transmitters showed that the most advantageous can be considered their location at an angle of 90 degrees to each other. The first zone of synchronous DRM broadcasting, created in Russia in the HF band, is described for the first time, providing a round-the-clock reception capability with broadcast quality over a large area. The results of the measurements showed that the network gain reached 6 dB when receiving on a wire antenna and up to 11 dB on a whip antenna. When using for broadcasting «daytime» and «night» frequencies, high-quality broadcasting with high reliability (98% of audio decoding) can be provided for 24 hours a day.

Keywords: Digital Radio Mondiale (DRM), single frequency network; synchronous broadcasting, synchronism zone calculating, SW range, test trials, measurement results.

References

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Information about author:
Oleg V. Varlamov, Doctor of Science, Head of Department of the Moscow Technical University of Communications and Informatics, Moscow, Russia