Focusing on the high outage probability of single relay and multiple-relay with equal power allocation strategies in Nakagami-m fading channels

an opportunistic relaying strategy with amplify-and-forward that decreases the outage probability in Nakagami-m fading channels is proposed.The optimal relay selection process in the proposed relaying strategy does not require all the channel state information but the transmission flag signals of source and destination

and hence

the system design is simplified.The proposed strategy is introduced to minimize the outage probability

and applies the near optimal power allocation method to transmit signals.It could be used in more generalized channels and it's exact outage probability can be obtained by calculating. The proposed strategy not only improves the system performance

but also has the practicability.Theoretical analysis and co

mparisons with the single relay and the multiple-relay with equal power allocation strategies show that when the fading parameter m=4 and outage probability is 10

-2

the signal-to-noise ratio of the opportunistic relay strategy could gain about 9 dB in Nakagami-m fading channels.