Question

Two CDMA users are assigned the 8-bit vectors A = 11001001;B = 10010101, respectively.
Are they orthogonal? (Prove or disprove)

Answer 1

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two vectors are orthogonal if the dot product between them is 0

that is A.B = 0

given A= 11001001

B= 10010101

A.B = 1*1 + 1*0 + 0*0 + 0*1 + 1*0 + 0*1 + 0*0 + 1*1 = 2 != 0 so they are not orthogonal