Question

Consider three hosts A, B, and C using Code Division Multiple Access (CDMA) with chip length m = 4. Their chips are the following:

A: +1 - 1 +1 -1; B: +1 +1 - 1 -1; C: +1 - 1 - 1 + 1

Show the resulting signal S when C transmits a 1 and B transmits a 0.

Discuss and show how we can infer from S that A did not transmit.

Please include details and explanations. I'm aware this problem has already been posted. Please do not copy the solution from the other post word for word and post it here. If you could elaborate on how the dot product values are different for A and B to clear up my understanding it would be greatly appreciated!

Answer 1