Digital transmit system and method

, In particular, adding a pre-coder for the data symbols at the same time as outputting the by-pass, predefined After convolutional encoding the additional data symbols related to a transmission system and possible existing compatible with the reception system capable of transmitting a separate additional data the sequence and multiplexed by transmitting, it is possible to obtain a greater coding gain for the additional data as compared to digital transmission systems using only a predefined sequence, it is possible to improve reception performance of the ghost of the channel, and the noise of the channel and it can further improve the performance of the ghost. Additional data, pre-coder bypass