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Soft-Decision LDPC Turbo Decoding for DQPSK Modulation in Coherent Optical Receivers

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We investigate DQPSK modulation combined with QC-LDPC coding. By applying iterative demodulation and soft-decision decoding, the differential decoding penalty is reduced by 2.05dB offering an attractive solution for coherent optical systems with soft-decision FEC.

© 2011 Optical Society of America

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