| 摘要 |
FIELD: optics.SUBSTANCE: invention relates to receivers of optical signals and can be used for recovery of code word of noisy optical signals. Method of recovering the code word from noisy digital optical signals, comprising their reception, conversion into electrical signals, amplification and filtration, characterized in that during analog-to-digital conversion form and store digital indication samples Ywith a volume of H, and using the arithmetic logic unit calculate the average selective value by formula:and average power value by formula:, that is taken as null line, then determine and memorize all intersection points of sample digital indications with null line, after that calculate the average values of amplitude of sample of positive +Aand negative -Apolarity by formula:, where j - number of interval from the point of intersection of digital indications with null line to the next intersection, and A- amplitude average values within the j-th interval are defined by formula:, where h is the number of indications within the j-th interval, the obtained value of amplitude Ain the j-th interval is compared with the average value of amplitude of sample Aand under the condition |A|<|A| it is assumed that transition before this interval is false, then at each j-th interval calculate energy Fby formula:, values of the obtained energies of adjacent intervals are compared, if |F-F|≥4Y h, transition is considered to be true, if |F-F|<4Y h, transition is considered to be false, in accordance with rules of encoding information arithmetic logic unit generates a digital sequence of logic zeros and ones.EFFECT: enabling reception of optical signals at low signal/noise ratios (less than 6) and increasing error ratio.1 cl, 3 dwg |
