5,999 research outputs found

    Probabilistically Shaped 4-PAM for Short-Reach IM/DD Links with a Peak Power Constraint

    Full text link
    Probabilistic shaping for intensity modulation and direct detection (IM/DD) links is discussed and a peak power constraint determined by the limited modulation extinction ratio (ER) of optical modulators is introduced. The input distribution of 4-ary unipolar pulse amplitude modulation (PAM) symbols is optimized for short-reach transmission links without optical amplification nor in-line dispersion compensation. The resulting distribution is symmetric around its mean allowing to use probabilistic amplitude shaping (PAS) to generate symbols that are protected by forward error correction (FEC) and that have the optimal input distribution. The numerical analysis is confirmed experimentally for both an additive white Gaussian noise (AWGN) channel and a fiber channel, showing gains in transmission reach and transmission rate, as well as rate adaptability.Comment: accepted for publication in Journal of Lightwave Technolog

    Frequency-domain transmit processing for MIMO SC-FDMA in wideband propagation channels

    Get PDF
    This document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available
    • 

    corecore