7. A CDMA receiver gets the following chips: (-1 +1 -3 +1 -1 -3 +1 +1). Assuming the chip sequences for stations A, B, C, and D are defined as the following, 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) Which stations transmitted, and which bits did each one send? You will need to compute each inner product. State what each station sends out. Solution