Implementación de las etapas de codificación, mapeo y mapeo inverso QAM de un transmisor de radio digital según el estándar DRM30

Abstract

The present paper aims to analyze the European digital radio standard DRM (Digital Radio Mondiale) for broadcast on AM Band, called DRM30, in order to perform a partial implementation of the coding stages, mapping and inverse QAM mapping. While conducting the study, it was determined that the standard consisted of 3 logical channels: Main Service Channel (MSC), fast access channel (FAC) and Service Description Channel (SDC). The implementation of the system was performed on a Windows system using the C ++ programming language in order to be scalable to other platforms and so it can be completed as part of future work. For the project validation, decoder modules implemented by the German institute Karlsruhe Institute of Technology Communications Engineering Lab, for GNU Radio software based on open source DreaM receptor, were used. Also an audio file loaded into the MSC was sent, in order to play it, once the channel is decoded. The validation results shown that our encoderimplementation complies the standard, because the encoded channels were reconstructed properly, which was tested making a comparison between the bits of the three channels. In addition, the audio carried in the MSC had a successful reproduction and reconstruction.