In Figure 2-28, there are four stations that can transmit. Suppose four more stations are added. Provide the chip sequences of these stations.

Figure 2-28

A = (-1-1 -1 +1 +1 -1 +1 +1) B = (-1 -1 +1-1 +1 +1 +1 -1) C = (-1 +1 -1 +1 +1 +1 -1 -1) D = (-1 +1 -1-1-1-1 +1 -1) (a) (b) S; = C S2 = B+C S3 = A+B S = A+B+C S5 = A+B+C+D = (-4 0-2 0 +2 0 +2 -2) Ss = A+B+C+D = (-2 2 0-2 0-2+4 0) = (-1 +1 -1 +1 +1 +1 -1 -1) = (-2 0 0 0 +2 +2 0-2) = ( 0 0-2 +2 0-2 0+2) = (-1 +1-3 +3 +1-1 -1 +1) S,C = [1+1-1+1+1+11-1]/8 = 1 S2C = [2+0+0+0+2+2+0+2]/8 = 1 SC = [0+0+2+2+02+02]/8 = 0 SC = [1+1+3+3+11+1-1]/8 = 1 SC = [4+0+2+0+2+02+2]/8 = 1 S-C = [2-2+02+024+0]/8 = -1 %3D %3D (c) (d)