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Table 1 s 1 , s 2 , s 12 , s n for different configurations of the full-rank pencil ( H 1 , H 2 )

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

Scenario Configuration s 12 s 1 s 2 s n
1 N r  + N d  < N s 0 N r N d N s  − (N r  + N d )
2 N r  + N d  = N s 0 N r N d 0
3 max(N r , N d ) < N s  < N r  + N d (N r  + N d ) − N s N s  − N d N s  − N r 0
4 N d  < N s  ≤ N r N d N r  − N d 0 0
5 N r  < N s  ≤ N d N r 0 N d  − N r 0
6 N s  ≤ min(N r , N d ) N s 0 0 0