Abstract: In a device for transmitting a sequence of information symbols over a plurality of partial channels having different transmission characteristics and together forming a transmission channel, the sequence of information symbols is grouped (102), whereupon a first set and a second set of the information symbols are coded (103a, 103b) using different coding methods. The coded information symbols are then combined in sets (104a, 104b) and are transmitted over a channel having two sets of partial channels. Both the first and the second set of partial channels have at least one partial channel whose signal-to-noise ratio without combining would be lower than a threshold signal-to-noise ratio which is minimally required by the coding method used for the set to which this partial channel belongs in order to achieve a predetermined reliability when decoding the information symbols and whose signal-to-noise ratio is greater than or equal to the threshold signal-to-noise ratio as a result of the combination step.