A CDMA receiver gets the following chips: (1 +1 3 +1 1 3 +1 +1). Assuming the chip sequences defined in Fig. 2-28(a), which stations

A CDMA receiver gets the following chips: (ˆ’1 +1 ˆ’3 +1 ˆ’1 ˆ’3 +1 +1). Assuming the chip sequences defined in Fig. 2-28(a), which stations transmitted, and which bits did each one send?

Figure 2-28(a)

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)