Non-regenerative relay communication system

A non-regenerative relay communication system that performs non-regenerative relay communication between a first communication station and a second communication station via a relay station, the system comprising:

• first delay calculation means that calculates a first signal-to-noise ratio in communication between the first communication station and the relay station and a first propagation delay that indicates a delay in the communication between the first communication station and the relay station based on a signal transmitted or received in the communication between the relay station and the first communication station:
• second delay calculation means that calculates a second signal-to-noise ratio in communication between the second communication station and the relay station and a second propagation delay that indicates a delay in the communication between the second communication station and the relay station based on a signal transmitted or received in the communication between the relay station and the second communication station;
• and
• communication determination means that performs the non-regenerative relay communication based on the first signal-to-noise ratio and the first propagation delay calculated by the first delay calculation means and the second signal-to-noise ratio and the second propagation delay calculated by the second delay calculation means.