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Analysis of Noise Spread in Optical DFT-S OFDM Systems

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6 Author(s)
Li Tao ; Dept. of Commun. Sci. & Eng., Fudan Univ., Shanghai, China ; Jianjun Yu ; Yuan Fang ; Junwen Zhang
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A discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S OFDM) scheme is attractive for its effective peak-to-average power ratio (PAPR) reduction. This paper presents another important issue about DFT-S OFDM, which is noise spread induced by the extra inverse discrete Fourier transform for DFT-S OFDM data recovery at the receiver. It would reduce the optical signal-to-noise ratio (OSNR) and spread the noise over the whole DFT-S OFDM subband, make DFT-S OFDM being more sensitive to noise distribution, and weaken the improvement induced by PAPR reduction. The principle of DFT-S OFDM generation and theoretical analysis of the noise spread in DFT-S OFDM signal processing at the receiver is presented. 100 Gb/s multiband DFT-S OFDM simulation system and 2.5 Gb/s experiment have been demonstrated to prove that the DFT-S OFDM scheme has worse performance than the conventional OFDM scheme under the condition of low OSNR and bad channel estimation; hence, it is more sensitive to the OSNR in transmission channel and needs more accurate channel estimation.

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Lightwave Technology, Journal of  (Volume:30 ,  Issue: 20 )