System Model
We consider a wireless relay system that consists of source, relay and destination nodes. It is assumed that the channel is in a half-duplex, orthogonal and amplify-and-forward relaying mode. Differently to the conventional direct transmission system, we exploit a time division relaying function where this system can deliver information with two temporal phases.
On the first phase, the source node broadcasts information toward both the destination and the relay nodes. The received signal at the destination and the relay nodes are respectively written as:
where is the channel from the source to the destination nodes, is the channel from the source to the relay node, is the noise signal added to and is the noise signal added to .
On the second phase, the relay can transmit its received signal to the destination node except the direct transmission mode.
Read more about this topic: Cooperative Diversity
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