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EXISTING SYSTEM

PROPOSED SYSTEM

EXISTING  CONCEPT:

·         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. The relaying nodes essentially operate in either amplify and forward (AF) and decode and-forward relaying nodes, 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.

PROPOSED CONCEPT:

·         The proposed selective or selection AF relaying schemes are operated only based on the quality of SR or relay-to-destination (RD) link. This is due to the fact that the SD link was assumed as a time invariant channel, thereby no diversity gain is obtained from the RT scheme.

         In practical, the SD link varies with an increase in time, thus diversity gain is also obtained. Therefore, a new threshold for selecting the transmitting node during the second phase is required considering SD and SR link qualities simultaneously

EXISTING TECHNIQUE :

·         Conventional AF relaying scheme.

PROPOSED TECHNIQUE:

          A selection amplify-and forward (AF) relaying scheme.

TECHNIQUE DEFINITION:

·         Relay network receives the input from the transmitter, amplify and forward it to the receiver.

TECHNIQUE DEFINITION:

·         AF relaying scheme defined for wireless cooperative communications network in which cooperation improves the performance of the system is the relay network.

DRAWBACKS:

·         Outage probability.

ADVANTAGES:

         A diversity gain

         Performance enhancement

        Lower outage probability