Implementation Of DRM+ Digital Broadcasting Receiver And Transmitter

Broadcasting and radio are widely used in spreading information, emergency communication and disaster early warning. And they are closely connected to the ordinary people’s life. Decades of development have been made to the traditional analog broadcasting. It has become the effective and convenient way for people to obtain information. But the analog signal is very vulnerable to the noise during the transmission. Such as the amplitude attenuation caused by the ionosphere fluctuations,multipath propagation which lead to the poor quality of service and eventually submerged in the noise. In addition, traditional analog broadcast has very low efficiency.Take amplitude modulation for example, there are at least fifty percent energy wasted on the sideband. FM somehow overcome the interference problems, but is limited by its technical characteristics, cannot be used to broadcast over a long distance. Generally speaking, the shortcomings of the traditional analog broadcasting are the poor sound quality, low energy and spectrum efficiency.With the development of modern communication technology, many digital modulation technologies appear. Satellite and mobile communication are vastly used in the daily life. Spectrum resource has become more and more precious and expensive.Efficiency and power consumption requirements are more and more strict. Traditional analog broadcasting no longer fit the needs of modern society which must change and evolve. On the premise of this demand, the European Telecommunications Standards Institute(ETSI) proposes the standard which is the digital solution of broadcasting in long wave medium wave and short wave, namely Digital Radio Mondiale(DRM). It is mainly aimed at the channel below 30 MHz, using COFDM(Coded Orthogonal Frequency Division Multiplexing) modulation technique and advanced sound source coding to replace the traditional AM radios. With the evolution of the standard, ETSI extends its coverage to the VHF band that is DRM+ standard.In this paper, the basic theory of COFDM is discussed. Then the software and hardware of DRM+ transmitter and receiver are proposed:1. Study the principle of COFDM and the core algorithm including modulation demodulation, synchronization and channel estimation algorithms.2. Based on the theory of COFDM and combine with DRM+ standard algorithmand simulation of receiver and transmitter are proposed.3. Study how to achieve DRM+ broadcasting, both software and hardware implementation.