Baseband Signals for DVB-x2

Abstract

In the first generation DVB standards (DVB-S, DVB-C and DVB-T), the format of the input data was confined only precisely to MPEG-2 transport streams where all the modulation and demodulation steps are firmly synchronously linked to the 188-bytes-long transport stream packet structure. An MPEG-2 transport stream packet begins with a 4-bytes-long header which, in turn, begins with a sync byte having the value 0x47. This limitation to the transport stream structure no longer exists in the new DVB-x2 standards. In the first generation DVB standards, it was also only possible to feed precisely one transport stream into the modulator, the only exception being DVB-T in its “hierarchical modulation” mode of operation where the modulator could be supplied with up to two transport streams. In the new DVB-x2 standards, up to 255 transport streams or generic streams, or both, can be fed into the modulator and transmitted. The present chapter deals with the input signals for the new DVB-x2 standards and how they are processed and conditioned in the input interfaces of the DVB-x2 modulators.