In this paper, we use the space time coding method in AF (amply-and-forward) cooperative network with two relay node by properly arranging the relay node working state. After deriving the SNR (signal to noise ratio) at the destination node, we show that the physical meaning of the SNR is equivalent to the SNR in the case of a resource transmitting via two paths while the destination received two additional noises coming from the relay node. In order to reach the maxima channel capacity, the optimal relay node position problem has been discussed in this paper under Rayleigh fading channel assumption.
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