Apparatus for controlling power of relay in amplify-forward relay system and method using the same

A method of controlling a power of a controlled relay, the method comprising:

• receiving signals which are transmitted to a plurality of receiving antennas directly from a source or via at least one relay;
• acquiring channel information between the source and the at least one relay, and between the at least one relay and the plurality of receiving antennas;
• generating a power control signal, based on the acquired channel information and an SNR of at least one of the signals received;
• and
• transmitting the generated power control signal to the controlled relay to control a transmit signal power with respect to the controlled relay.

A computer-readable recording medium storing a program for implementing a method of controlling a power of a relay, the method comprising:

• receiving signals which are transmitted to a plurality of receiving antennas directly from a source or via at least one relay;
• acquiring channel information between the source and the at least one relay, and acquiring channel information between the at least one relay and the plurality of receiving antennas;
• generating a power control signal, based on the acquired channel information and a signal-to-noise ratio (SNR) of at least one of the signals received;
• and
• transmitting the generated power control signal to the relay and thereby controlling a transmit signal power with respect to the at least one relay.