A fast evaluation of the error rate in fiber optic digital transmission systems with mutually independent symbols was recently proposed. The method is based on a Gram-Charlier series expansion and requires the joint conditional moments of the digital signal and shot noise variance, the condition being on the digital data sequence. The paper extends the above method to systems with correlated symbols, in which the correlation is produced by line encoding. Using a sequential machine representation for the line encoder a fast technique of moment evaluation is set up, where the computational work increases linearly with the number of interferers, thus avoiding the exponential grows of the exhaustive method.
Error probabilty evaluation in fiber optic digital systems with correlated symbols and comparison of some block encodings
BENVENUTO, NEVIO;PUPOLIN, SILVANO
1978
Abstract
A fast evaluation of the error rate in fiber optic digital transmission systems with mutually independent symbols was recently proposed. The method is based on a Gram-Charlier series expansion and requires the joint conditional moments of the digital signal and shot noise variance, the condition being on the digital data sequence. The paper extends the above method to systems with correlated symbols, in which the correlation is produced by line encoding. Using a sequential machine representation for the line encoder a fast technique of moment evaluation is set up, where the computational work increases linearly with the number of interferers, thus avoiding the exponential grows of the exhaustive method.
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