Question: 5. (20%) Consider the CDMA technique and assume that users A and B have spreading codes 01010101 and 01011010 , respectively. Denote bit 0 as

5. (20%) Consider the CDMA technique and assume that users A and B have spreading codes 01010101 and 01011010 , respectively. Denote bit 0 as -1 and bit 1 as +1 . (a) How can one determine if these two spreading codes are orthogonal? (b) What is the compound signal content if A sends a data bit 0 and B sends a data bit 1 ? (c) What data bit is transmitted by users A and B, respectively, if the compound signal content is (0, 0,0,0,2,2,2,2)? (d) How can a user know that the received signal content does not contain relevant data bits to it

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