حساب احتمال الخطأ في نظام الاتصال الضوئي الليفي الرقمي

In digital fiber optic transmission systems and during the photo detection process, a shot noise is produced: it is a type of noise neither stationary nor independent of the digital message. Therefore, the evaluation of both the average error probability, in the presence of such a noise, and the effect of the symbol interference, brings about an impact to be taken into account. This noise can be calculated in two methods: the EXHAUSTIVE and GRAM-CHARLIER series expansion. The latter is preferred, when the number of interfering factors is somehow large. This research aims at calculating the average error probability in the PAM transmission system, including interfering symbols. The current writers will also present some numerical examples of binary independent-symbol transmission as illustrative cases.