Digital broadcasting system and method thereof

This digital broadcasting system is disclosed. After this system, multiplexing the normal stream and the turbo stream by inserting an additional reference signal in the transmission stream generating device, the dual transport stream to generate the dual transport stream, and performs a signal process for the turbo stream reconstructed dual transport stream , receives the dual transport stream transmission apparatus and the reconstruction of outputting the dual transport stream reconstruction, after separately turbo decoding the turbo stream reinserted into a dual transmission stream and decoding the turbo stream is re-inserted dual transport stream to include a receiving device to restore normal stream data and turbo stream data. Accordingly, it is possible to effectively improve the reception performance of the digital broadcast signal. Digital broadcast, the dual transport stream, the turbo stream, the additional reference signal