Space-Time Block Code -l The received signals are y=a,x+a2* 2+n y2==01X2+c2x1+n2 Calculate the decision variables as 米=a+2=(1P+1)x++n Vi-aly (a2+1)-h+an Similar to that of a two-branch maximal ratio combining receiver diversity system Unfortunately, the technique is sensitive to delays Georgia Institute of Technology Center for Signal and Image ProcessingGeorgia Institute of Technology Center for Signal and Image Processing • The received signals are • Calculate the decision variables as • Similar to that of a two-branch maximal ratio combining receiver diversity system! • Unfortunately, the technique is sensitive to delays. Space-Time Block Code - II ( ) ( ) 2 2 * * * 1 1 1 2 2 1 2 1 1 1 2 2 2 2 * * * 2 2 1 1 2 1 2 2 1 2 2 1 ˆ . ˆ x y y x x y y x                   = + = + + + = − = + − + 1 1 1 2 2 1 * * 2 1 2 2 1 2 . y x x y x x       = + + = − + +