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- W2000352667 abstract "Recently, the orthogonal frequency division multiplexing (OFDM) technique has been extensively studied for fiber-based optical transmissions in the context of access networks. The adaptive modulation optical (AMO) OFDM system has been proved to be one of the cost-effective solutions. Among adaptive modulation techniques, the Levin-Campello (LC) bit/power loading, which is widely implemented for xDSL systems, is shown to bring excellent performances in unamplified optical intensity modulated/direct detected (IMDD) transmissions. In this paper a novel adaptive discrete Fourier transform precoded OFDM (POFDM) is proposed and investigated. By means of numerical simulation, the proposed modulation scheme is shown to reduce the peak-to-average power ratio of the transmitted OFDM signal up to 2 dB at 10 -3 clipping rate. As a consequence, a smaller input back-off can be applied to the laser-driving current before the power amplifier, resulting in a lower power consumption of the POFDM system when compared to the conventional LC AMOOFDM system. According to simulation results, the energy consumption of the power amplifier is reduced by a factor of two in unamplified optical IMDD transmissions. Moreover, in terms of capacity-versus-reach performance, the proposed system achieves the same performance as the conventional adaptive modulation scheme." @default.
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- W2000352667 date "2014-03-01" @default.
- W2000352667 modified "2023-10-16" @default.
- W2000352667 title "DFT Precoded OFDM—An Alternative Candidate for Next Generation PONs" @default.
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- W2000352667 doi "https://doi.org/10.1109/jlt.2014.2301632" @default.
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