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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 30, Iss. 20 — Oct. 15, 2012
  • pp: 3219–3225

Analysis of Noise Spread in Optical DFT-S OFDM Systems

Li Tao, Jianjun Yu, Yuan Fang, Junwen Zhang, Yufeng Shao, and Nan Chi

Journal of Lightwave Technology, Vol. 30, Issue 20, pp. 3219-3225 (2012)

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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.

© 2012 IEEE

Li Tao, Jianjun Yu, Yuan Fang, Junwen Zhang, Yufeng Shao, and Nan Chi, "Analysis of Noise Spread in Optical DFT-S OFDM Systems," J. Lightwave Technol. 30, 3219-3225 (2012)

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