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 ?Solution
In Alternate Mark Inversion (AMI) bipolar encoding, binary 1 is transmitted as alternating +V and βV, while binary 0 is transmitted as 0 V. For the input data 1011, the transmitted levels are {+1, 0, β1, +1}. The received sequence is {+1, 0, β1, β1}. 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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