Here, the source sends the message directly to the destination and the relay node alsosends the compressed version of the signal to the destination. Relay nodes use Wyner-Ziv code for the compression and don't do the decoding and encoding like in the case of DF.The receiver correlates signals received from the source and the relay nodes. Then it decodes the original message. CF has been shown to outperform AF and DF, especially when the relay node is located closer to the destination node