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A CDMA system has three stations with the following chip sequences: A: (0 0 0 0), B: (0 0 1 1), and  C: (0 1 0 1)

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A CDMA system has three stations with the following chip sequences: A: (0 0 0 0), B: (0 0 1 1), and  C: (0 1 0 1). 

a) Figure out a possible chip sequence for the 4th station, say  D,  which we want to add in  this group.

b) Show that the new station’s chip sequence is pair - wise orthogonal with the chip sequences of the other three stations. 

c) If a CDMA receives gets the following chips:  ( −1 +1 −1  −3), then which stations transmitted and which bits did each one send?