Viterbi equalizer with analytically calculated branch metrics for optical ASK and DBPSK
- 19 December 2005
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Photonics Technology Letters
- Vol. 18 (1) , 277-279
- https://doi.org/10.1109/lpt.2005.860054
Abstract
We analytically derive probability density functions of the sampled electrically filtered photo current for optical amplitude-shift keying and differential binary phase-shift keying using the Karhunen-Loe/spl grave/ve series expansion method. This allows us to determine exact branch metrics for a Viterbi equalizer. We then compare the performance of histogram-based Viterbi equalizers with those using analytically calculated branch metrics.Keywords
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