Base StationSourceEarthU R HereMarsYX1RelaySource Receiver1Y X2Relay Channel1 1 2p( y , y | x , x )Relay 1Y1Y1XX2p(y |x )1 11 2p(y|x , x )+Relay 1+Y1Y1ZZ1XX2Y1 Y01X1Y01Y101X1YX1RelaySource Receiver1Y X2Relay Channel1 1 2p( y , y | x , x )YX1RelaySource Receiver1Y X2Relay Channel1 1 2p( y , y | x , x )YX1RelaySource Receiver1Y X2Relay Channel1 1 2p( y , y | x , x )Relay 1Relay 2Y1Y2Yr1XXr2X1r1 r2p( y | x , x )MAC ChannelBCST Channel2p(y , y | x )1 1++Relay 1Relay 2+Y1Y2Y1Z2ZZr1XXr2X1Relay 1Relay 2Y1Y2Yr1XXr2X1r1 r2p( y | x , x )MAC ChannelBCST Channel2p(y , y | x )1 1Relay 1Relay 2Y1Y2X1BCST Channel2p(y , y | x )1 1Rate R1Rate
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