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Four mobile phones A,B,C and D want to communicate with a base station at the same time. 1. Develop the spreading codes for each of

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Four mobile phones A,B,C and D want to communicate with a base station at the same time. 1. Develop the spreading codes for each of them. (10 marks) 2. Assume the bits A,B,C and D want to transmit are 0,0,1 and 1 . Show how your spreading codes can help to avoid interference among these mobile phones. (10 marks)

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