| 摘要 |
A method of measuring a Q-value according to a mean value and standard deviation of a signal level distribution of input data comprises: a first step for calculating a difference between bit error rates of input data sampled by a plurality of threshold values which are a little different from each other; a second step for calculating a difference between the difference data obtained in the first step; and a third step (steps 118 and 120) for calculating a mean value and standard deviation of the signal level of input data when data obtained in the first and the second step (steps 100 to 116) are utilized.
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