Source, relay, and destination executing cooperation transmission and method for controlling each thereof

A method for controlling a relay node relaying a signal between a plurality of source nodes and a plurality of destination nodes, the method comprising:

• receiving, from a first transmission direction, a data stream from at least one of the plurality of source nodes;
• extracting at least one relay signal from the received data stream;
• determining a second transmission direction of the at least one relay signal toward at least one of the plurality of destination nodes, based on a polynomial of a channel gain between the relay node and the plurality of destination nodes;
• and
• transmitting the at least one relay signal to at least one of the plurality of destination nodes, based on the determined second transmission direction.

A method for controlling a destination node communicating with a plurality of relay nodes relaying a message encoded in a plurality of source nodes, the method comprising:

• receiving a relay signal from the plurality of relay nodes;
• estimating a data stream from the relay signal received from the plurality of relay nodes, based on a channel gain between the plurality of relay nodes and the destination node;
• decoding the estimated data stream;
• and
• outputting the decoded message.