Determination of Optimal Pseudo Threshold for Bit Error Rate Measurement

摘要

In the present invention, in the measurement of the bit error rate by using the extrapolation method, a linear equation with linearity is obtained by using the correlation coefficient between the log value of the pseudo-threshold value and the blog value of the bit error rate for accurate measurement of the bit error rate. The present invention relates to a method for determining pseudo-threshold values necessary for measuring the actual bit error rate by substituting the logarithm of the actual threshold value into a linear equation. The method determines the three pseudothresholds (x ₁ , x ₂ , x ₃ ) used in the bit error rate measurement at equal intervals (T) and in order of magnitude (x ₁ x ₂ = x ₁ + Tx ₃ = x ₂ + T) into memory in order. The number of errors obtained on the basis of the total number of samples and three pseudothresholds (x ₁ , x ₂ , x ₃ ) is obtained through the counter. The pseudo bit error rate is calculated for each pseudo threshold value through each operator, and the blog value of the pseudo bit error rate is calculated based on the log values of the three pseudo threshold values and the respective pseudo threshold values. The absolute values of the correlation coefficients for the dublog values of three pseudo bit errors are obtained based on the log values of the three pseudo threshold values and the respective pseudo threshold values. From the absolute value of the correlation coefficient, the linearity of the log value of three pseudothreshold values and the blog value of three pseudo bit error rates is determined. If the linear discriminator determines that there is no linearity, it sets a new pseudothreshold, selects one of the three existing storage units, replaces the existing pseudothreshold with a new pseudothreshold, and then The log value of the threshold and the two existing thresholds and the pseudo-error of each pseudo bit error rate based on these three pseudo thresholds are obtained. Three pseudo-thresholds when the dublog value of each pseudo bit error rate determined based on the log values of three pseudothreshold values and the three pseudothreshold values based on the absolute value of the correlation coefficient are determined to be linear. Obtain a linear equation that passes three points consisting of the logarithm of the value and the blog value of the pseudo bit error rate based on each pseudo-threshold value, and substitute the logarithm of the actual threshold value into the linear equation to find the y-axis value. The actual bit error rate is measured by taking the natural exponential function twice. Therefore, the actual bit error rate can be measured by the number of samplings smaller than the number of sampling required to obtain the actual bit error rate determined from the actual threshold value.