Patent ID: 8693527
Filing Date: 2014-04-08
Classification: H04B

Abstract:
1. A relay apparatus for relaying a signal from a transmitter to a receiver in a MIMO based communication system, comprising: a power difference determination unit configured to determine a difference of reception levels between a direct wave and a relayed wave based on positional relationship among the transmitter, the relay apparatus and the receiver, the direct wave traveling from the transmitter to the receiver without the relay apparatus, the relayed wave traveling from the transmitter to the receiver via the relay apparatus; a gain determination unit configured to determine an amplification gain of the relay apparatus to make the difference smaller; and a transmitting unit configured to amplify the signal from the transmitter at the determined amplification gain and transmit the amplified signal to the receiver, wherein if a communication environment is not a non-line-of-sight environment, the difference is determined as a difference of reception levels between the direct wave and relayed wave, and if the communication environment is a non-line-of-sight environment, the difference is determined as a difference of averaged reception levels between the direct wave and the relayed wave.