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Layered Division Multiplexing (LDM) is a novel non-orthogonal multiplexing access (NOMA) technique, based on power allocation techniques, which has been recently included in the ATSC 3.0 Digital Television Terrestrial (DTT) standard. In the recent literature, the LDM capabilities have been studied just for the two layered case, mainly when one of the layers is targeting mobile/indoor services and...
The 26 MHz band is currently allocated for international broadcasting by means of the ionospheric propagation. However, sky waves are strongly dependent on the ionosphere conditions and signal reception is not always possible. As a consequence, this HF frequency range is scarcely utilized and an optimization of its use is required. The DRM (Digital Radio Mondiale) standard provides enough robustness...
This paper presents a methodology for efficient measurement of digital broadcasting signals, both with field trials or at the laboratory. The study is focused on measuring the C/N requirement for achieving a threshold BER. A comparison between the traditional techniques and the proposed methodology is analyzed in this work. The key of the methodology presented in this paper is the use of general purpose...
A characterization of the potential long distance sky wave interferences between DRM local services in the 26 MHz band is presented in this paper. To do this, a statistical analysis of the ionospheric conditions that cause such electromagnetical impairments has been done in order to contribute to the ITU-R Question 127/6 concerning the use of digital modulation in the 26 MHz band for local coverage...
This paper presents an analysis of the ground wave propagation in the 26 MHz band based on a comparison between measured and predicted field strength values. To do this, a set of empirical data obtained from a measurement campaign of a DRM experimental local service was used. Simulated field strength values were calculated applying two different models that account for the space and surface wave propagation...
This paper presents a comparison study between carrier to noise (C/N) values measured outdoors and indoors in five office buildings of a city in Spain, related to radio broadcasted signals. Measurements were carried out in Bilbao at three frequencies in the medium wave band: 639 kHz, 990 kHz and 1305 kHz. Results show that outdoor mean C/N results are 7.5 dB higher than indoors for 639 kHz and 6.5...
The 26 MHz band is the highest frequency broadcasting band covered by DRM bellow 30 MHz. Due to its low use for long-range transmissions, this band is been tested for using the DRM digital radio for local coverage. This paper shows the results for mobile reception of two field trials made in Mexico City and Brasilia.
• The local broadcasting with low transmission power is feasible • DRM recommended mode: - Robustness mode: B - Modulation of MSC Channel: 16 QAM - Protection level: 0.5
The digital broadcasting systems (DRM and HD radio/ IBOC) developed in the last decade have renewed the interest for the MW band. The planning requirements of the digital services require more accurate channel models and a significant improvement in the coverage estimation algorithms. The variability of the local median values (sigmaL) is a key parameter in the estimation process of the coverage percentage...
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