Abstract
In this paper, we propose low-complexity, high-performance
soft-equalization techniques for mitigating polarization mode dispersion
(PMD) and chromatic dispersion (CD) in fiber optic communication systems
employing multilevel modulation and coherent detection. Using deterministic
sampling and tree search, the two proposed algorithms offer near-optimal
performance at a much lower complexity than the maximum-likelihood sequence
detection (MLSD). Moreover, the a posteriori symbol probabilities at
the output can be employed effectively as a soft-input–soft-output
demodulator in a turbo-type receiver in a channel-coded system to
successively improve the receiver performance. Computer simulation results
are provided to demonstrate the effectiveness of the proposed equalizers in
high-speed fiber optic channels.
© 2009 IEEE
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