LW, MW, SW, VHF
DRM (digital radio mondiale) was developed by a consortium of radio broadcasters and manufacturers in order to utilize the frequency ranges previously used by AM transmitters (DRM30 with the four transmission modes A through D). A further variant includes the former FM range (mode E). Audio, video and / or data signals are transmitted. DRM is standardized by ETSI.
COFDM (coded orthogonal frequency division mutiplex) with various bandwidths. COFDM systems use OFDM modulation with forward error correction. Individual carriers are usually QAM (quadrature amplitude modulation) or QPSK modulated (quadrature phase shift keying). The guard intervals do not show a drop in the carrier.