AMPLIFY AND FORWARD RELAY:
The amplify-and-forward relay protocol is a protocol defined for wireless Cooperative communication.An example of a wireless communication network in which cooperation improves the performance of the system is the relay Network In this case, the relay just amplies its received signal, maintaining a fixed average transmit power. selection amplify-and-forward (AF) relaying scheme which has the lower outage probability than that of a conventional AF relaying scheme in cooperative relay networks. In real wireless environments, as the channel of source-to-destination (SD) link varies with an increase in time, we can also obtain a diversity gain through the SD link by re transmission in common with a conventional AF relaying scheme. Thus, we can expect a performance enhancement by adaptively determining the transmitting node between the relaying and source nodes
Fig :amplify and forward Relay
In cooperative relay networks, relaying nodes can forward information from a single antenna terminal to form a virtual antenna array, and thereby achieving space diversity and improving the system performance, hence cooperative communications have attracted much attention. The relaying nodes essentially operate in either amplify and- forward (AF) and decode-and-forward relaying modes, which are basic for various evolved relaying schemes.the adaptive selective relaying scheme which determines the best among multiple AF relaying nodes having the maximum received SNR through the SR link was proposed, and its performances of outage channel capacity , symbol error rate were analyzed
FOR MORE DETAILS
ON THE OUTAGE PERFORMANCE OF SELECTION AMPLIFY-AND-FORWARD RELAYING SCHEME
The amplify-and-forward relay protocol is a protocol defined for wireless Cooperative communication.An example of a wireless communication network in which cooperation improves the performance of the system is the relay Network In this case, the relay just amplies its received signal, maintaining a fixed average transmit power. selection amplify-and-forward (AF) relaying scheme which has the lower outage probability than that of a conventional AF relaying scheme in cooperative relay networks. In real wireless environments, as the channel of source-to-destination (SD) link varies with an increase in time, we can also obtain a diversity gain through the SD link by re transmission in common with a conventional AF relaying scheme. Thus, we can expect a performance enhancement by adaptively determining the transmitting node between the relaying and source nodes
In cooperative relay networks, relaying nodes can forward information from a single antenna terminal to form a virtual antenna array, and thereby achieving space diversity and improving the system performance, hence cooperative communications have attracted much attention. The relaying nodes essentially operate in either amplify and- forward (AF) and decode-and-forward relaying modes, which are basic for various evolved relaying schemes.the adaptive selective relaying scheme which determines the best among multiple AF relaying nodes having the maximum received SNR through the SR link was proposed, and its performances of outage channel capacity , symbol error rate were analyzed
FOR MORE DETAILS
ON THE OUTAGE PERFORMANCE OF SELECTION AMPLIFY-AND-FORWARD RELAYING SCHEME
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