Patent Document ID: 8818772
Application ID: 13328632
Patent Flag: 1

Claim One:
1. A variance estimation apparatus of an amplitude probability distribution (APD) model, the apparatus comprising: a processor to execute: calculating an APD curve of the APD model for noise of an electronic device; determining a linearity of a slope of the APD curve calculated; and selectively performing equivalent variance processing or different variance processing corresponding with a result of the linearity determination, wherein the different variance processing includes: obtaining a probability density function of a histogram for the calculated APD curve; searching an upper limit vertex and a lower limit vertex of the obtained probability density function; calculating measurement values of the upper limit vertex and the lower limit vertex of the probability density function; estimating a variance for each of the calculated measurement values of the upper limit vertex and that of the lower limit vertex; and obtaining a maximum probable bit error rate of a binary phase shift key (BPSK) system in a Gaussian channel environment using the variances estimated.