Medium wave DRM field trials in Brazil – Some daytime and nighttime results in urban environment |
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| Authors: | MPC Almeida RP David RSL Souza PVG Castellanos JA Cal Braz MV Lima FF Lima LAR Silva Mello |
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| Affiliation: | 1. National Institute of Metrology, Quality and Technology, Inmetro, Rio de Janeiro, Brazil;2. Ministry of Communications, Brasília, Brazil;3. Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro, Brazil |
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| Abstract: | The Digital Radio Mondiale (DRM) system broadcasts audio in the frequency band below 174 MHz and . In this experiment in urban areas in Brazil, a hybrid signal composed of an analog AM signal and a digital DRM30 signal, with the same content, were broadcasted in diurnal and nocturnal transmissions. This paper describes the experimental setup, which employs the spectral shaping technique in simulcast transmission 14], and presents some results of medium wave propagation measurements campaigns that are being carried out in Brazil. The experiment is part of a series of field trials that are being conducted by the Brazilian Government which includes campaigns at MW, HF and VHF frequency bands. |
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| Keywords: | DRM system DRM30 AM broadcast Digital radio Medium wave OFDM Spectral shaping technique |
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