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    Question

    If 1011 is transmitted with alternate-mark-inversion

    bipolar encoding and the corresponding transmitted voltage levels are {+1,0,-1,+1}. If the received voltage levels due to noise are {+1,0,-1,-1} then how many bits are detected to be in error ?
    A 1 Correct Answer Incorrect Answer
    B 3 Correct Answer Incorrect Answer
    C 4 Correct Answer Incorrect Answer
    D 2 Correct Answer Incorrect Answer

    Solution

    In Alternate Mark Inversion (AMI) bipolar encoding, binary 1 is transmitted as alternating +V and –V, while binary 0 is transmitted as 0 V. For the input data 1011, the transmitted levels are {+1, 0, –1, +1}. The received sequence is {+1, 0, –1, –1}. Comparing symbol by symbol, the first three match correctly, but the last symbol differs. Therefore, only one bit is in error.

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