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Table 1 The transmission modes for each situation, where y i , n i C i ,i=4,5,2L+1,2L+3; x j C j ,j=2,2L

From: Alternative relaying for cooperative multiple-access channels in wireless vehicular networks

Situation Transmission mode Equivalent channel matrix
Situation A0 y 2 L + 1 = H A 0 x 2 L + n 2 L + 1 Mode 1 H A 0 = h S 1 0 0 0 α 2 h S 2 α 1 h S 2 0 0 0 α 2 h S 1 α 1 h S 1 0 0 0 α 2 h S 2 α 1 h S 2 0 0 0 h S 1 ( 2 L + 1 ) × 2 L Matrix
Situation A1 y 4 = H A 1 x 2 + n 4 Mode 2 H A 1 = h S 1 0 α 2 h S 2 α 1 h S 2 g 1 , r 1 h S 1 0 g 1 , r 1
Situation A2 event E ¯ y 5 = H A 2 , E ¯ x 2 + n 5 Mode 3 H A 2 , E ¯ = h S 1 0 α 2 h S 2 α 1 h S 2 g 1 , r 1 h S 1 g 2 , r 2 g 1 , r 1 0 g 2 , r 2
Situation A2 event E y 2 L + 3 = H A 2 , E x 2 L + n 2 L + 3 Mode 4 H A 2 , E =H, refer to Eqution (3).