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Table 3 Scenario 4 communication scheme

From: Joint SVD-GSVD precoding technique and secrecy capacity lower bound for the MIMO relay wire-tap channel

Step Source Relay
1 performs a GSVD of (H1, H2)  
2 performs a GSVD-based precoding to construct a codeword that conveys the messages towards the relay over his respective private channels  
3   performs an SVD-based precoding to beamform the message towards the destination