A transmitter comprising an apparatus for assigning transmission symbols to a media data stream of information symbols, the media data stream comprising a first substream for representing a media content in a basic quality and a second substream comprising additional data for representing the media content, along with the first data stream, in an improved quality, comprising: a first means (512 1) for assigning first transmission symbols to the information symbols of the first substream; a second means (512 2) for assigning second transmission symbols to the information symbols of the second substream, the first transmission symbols being transmissible, via a transmission channel, with reduced error probability as compared to the second transmission symbols, in that the first transmission symbols originate from an m.ary modulation alphabet and the second transmission symbols originate from an n.ary modulation alphabet, wherein m ≤ n and m and n are natural numbers, the transmitter further comprises a channel coder configured to add redundancy to the first and/or the second substream(s) so that the added redundancy is different for the first and second substreams and/or the transmitter further comprises a power controller configured to associate different transmit powers with the transmission symbols of the first and second substreams, by weighting the same with different power factors; a DFT, discrete Fourier transform, spreader configured to transform the transmission symbols of the first and second substreams with DFT spreading sequences of a DFT to a frequency range and to then add them to obtain an output signal; and an OFDM (orthogonal frequency division multiplexing) transmitter configured to transmit the output signal - superimposed in a shared frequency range - via a radio channel as the transmission channel; a means for assigning radio resources that are adapted to, via scheduling, assign radio resources in form of inputs of the DFT to the first transmission symbols and to the second transmission symbols, and to balance off variable data rates of the first substream and of the second substream, the transmitter being configured to transmit the first and second transmission symbols as broadcast transmissions. a first means (512 1) for assigning first transmission symbols to the information symbols of the first substream; a second means (512 2) for assigning second transmission symbols to the information symbols of the second substream, the first transmission symbols being transmissible, via a transmission channel, with reduced error probability as compared to the second transmission symbols, in that the first transmission symbols originate from an m.ary modulation alphabet and the second transmission symbols originate from an n.ary modulation alphabet, wherein m ≤ n and m and n are natural numbers, the transmitter further comprises a channel coder configured to add redundancy to the first and/or the second substream(s) so that the added redundancy is different for the first and second substreams and/or the transmitter further comprises a power controller configured to associate different transmit powers with the transmission symbols of the first and second substreams, by weighting the same with different power factors; the first transmission symbols originate from an m.ary modulation alphabet and the second transmission symbols originate from an n.ary modulation alphabet, wherein m ≤ n and m and n are natural numbers, the transmitter further comprises a channel coder configured to add redundancy to the first and/or the second substream(s) so that the added redundancy is different for the first and second substreams and/or the transmitter further comprises a power controller configured to associate different transmit powers with the transmission symbols of the first and second substreams, by weighting the same with different power factors; a DFT, discrete Fourier transform, spreader configured to transform the transmission symbols of the first and second substreams with DFT spreading sequences of a DFT to a frequency range and to then add them to obtain an output signal; and an OFDM (orthogonal frequency division multiplexing) transmitter configured to transmit the output signal - superimposed in a shared frequency range - via a radio channel as the transmission channel; a means for assigning radio resources that are adapted to, via scheduling, assign radio resources in form of inputs of the DFT to the first transmission symbols and to the second transmission symbols, and to balance off variable data rates of the first substream and of the second substream, the transmitter being configured to transmit the first and second transmission symbols as broadcast transmissions.