Method of transmitting signal in satellite communication system with terrestrial component

A method of transmitting a signal to a terminal in a satellite communication system with a plurality of terrestrial components, comprising:

• generating a first group of transmission signals that is directly transmitted to the terminal, on the basis of a first symbol index for a first transmission signal and a second symbol index for a second transmission signal to transmit to the terminal;
• generating a second group of transmission signals that is transmitted to the terminal through the terrestrial component, on the basis of the first symbol index and the second symbol index;
• generating a third group of transmission signals that is transmitted to the terminal through the terrestrial components, on the basis of a first transmission data symbol and a second transmission data symbol that are obtained by operating the first symbol index and the second symbol index;
• and
• generating a space-time code comprising the first group of transmission signals, the second group of transmission signals, and the third group of transmission signals, and transmitting the space-time code to the terminal and the terrestrial components.