COFDM combined encoder modulation for digital broadcasting sound and video with PSK, PSK/AM, and QAM techniques

摘要

In a digital broadcasting transmitter network system operating on a DAB principle, in which: digital programs to be broadcast via individual transmitting stations after corresponding data reduction are coded and modulated in accordance with COFDM technique; data of digital sound and/or video programs is packed into a plurality of COFDM signal packets and transmitted via a transmitting station; and/or two or three 4 PSK-COFDM coders having their outputs combined via an adder stage are used for producing individual COFDM signal packets so that the data quantity to be transmitted can be increased. Feeding of increased data quantity may take place via digital satellite channels under a DSR principle at higher-order modulation.