Apparatus for assigning and estimating transmission symbols

摘要

An apparatus for assigning transmission symbols to a media data stream of information symbols is described, the media data stream including a first substream for representing media content in a basic quality and a second substream including additional data for representing the media content, along with the first substream, in an improved quality. The apparatus includes a first assigner for assigning first transmission symbols to the information symbols of the first substream and a second assigner 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.

主权项

1. 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 assigner configured to assign first transmission symbols to the information symbols of the first substream; a second assigner configured to assign second transmission symbols to the information symbols of the second substream; a frequency spreader configured to superimpose the transmission symbols of the first and second substreams in a shared frequency range including a plurality of OFDM (orthogonal frequency division multiplexing) carriers, respectively, to obtain an output signal, by transforming the transmission symbols of the first and second substreams with DFT (discrete Fourier transform) spreading sequences together defining a DFT, respectively, to obtain transformed symbols for each transmission symbol of the first and second substreams, respectively, and superimposing the transformed symbols by addition on a per OFDM carrier basis in the shared frequency range; an OFDM transmitter configured to transmit the transmission symbols that are superimposed in the shared frequency range via a radio channel as the transmission channel; and an assigner configured to assign, by scheduling, radio resources in the form of inputs of the DFT that are adapted to assign radio resources to the first transmission symbols and to the second transmission symbols, and to balance variable data rates of the first substream and of the second substream; wherein the first transmission symbols are transmissible, via a transmission channel, with reduced error probability as compared to the second transmission symbols; and the transmitter is configured to transmit the first and second transmission symbols as broadcast transmissions.