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Three mobile phones A,B,C want to communicate with a base station at the same time. (20 marks) 1. Develop a spreading code for each of

Three mobile phones A,B,C want to communicate with a base station at the same time. (20 marks) 1. Develop a spreading code for each of them. (8 marks) 2. Show how your spreading codes can help to avoid interference among these mobile phones. (12 marks)

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