Abstract

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

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  1. J. Yu, "Field trial Nyquist-WDM transmission of 8 x 216.4 Gb/s PDM-CSRZ-QPSK exceeding 4 b/s/Hz spectral efficiency," Proc. Opt. Fiber Commun. Conf. (2012) pp. 1-3.
  2. J. Yu, "Generation, transmission and coherent detection of 11.2 Tb/s (112 x 100 Gb/s) single source optical OFDM superchannel," Proc. Opt. Fiber Commun. Conf. (2011) pp. 1-3.
  3. J. Yu, Z. Dong, N. Chi, "1.96-Tb/s(21 x 100 Gb/s) optical OFDM superchannel generation and transmission over 3200-km SMF-28 with EDFA-only," IEEE Photon. Technol. Lett. 23, 1061-1063 (2011).
  4. J. Yu, "1.2 Tbit/s orthogonal PDM-RZ-QPSK DWDM signal transmission over 1040 km SMF-28," Electron. Lett. 46, 775-777 (2010).
  5. Y. Ma, "1-Tb/s per channel coherent optical OFDM transmission with subwavelength bandwidth access," Proc. Opt. Fiber Commun. Conf. (2009) pp. 1-3.
  6. Z. Cao, "Direct-detection optical OFDM transmission system without frequency guard band," IEEE Photon. Technol. Lett. 22, 736-738 (2010).
  7. F. Li, "Reducing the peak-to-average power ratio with companding transform coding in 60 GHz OFDM-ROF systems," J. Opt. Commun. Netw. 4, 202-209 (2012).
  8. J. Armstrong, A. J. Lowery, "Power efficient optical OFDM," Electron. Lett. 42, 370-372 (2006).
  9. Q. Yang, "Coherent optical DFT-spread OFDM transmission using orthogonal band multiplexing," Opt. Exp. 20, 2379-2385 (2012).
  10. Y. Tang, W. Shieh, B. S. Krongold, "DFT-Spread OFDM for fiber nonlinearity mitigation," IEEE Photon. Technol. Lett. 22, 1250-1252 (2010).
  11. W. Shieh, "Coherent optical OFDM: Has its time come?," J. Opt. Netw. 7, 234-255 (2008).
  12. X. Liu, F. Buchali, "Intra-symbol frequency-domain averaging based channel estimation for coherent optical OFDM," Opt. Exp. 16, 21944-21957 (2008).
  13. S. Wu, Y. Bar-Ness, "A phase noise suppression algorithm for OFDM-based WLANs," IEEE Commun. Lett. 6, 535-5357 (2002).
  14. C. Muschallik, "Influence of RF oscillators on an OFDM signal," IEEE Trans. Consum. Electron. 41, 592-603 (1995).
  15. A. J. Lowery, "Amplified-spontaneous noise limit of optical OFDM lightwave systems," Opt. Exp. 16, 860-865 (2008).
  16. L. Tao, "Generation of flat and stable multi-carriers based on only integrated IQ modulator and its implementation for 112 Gb/s PM-QPSK transmitter," presented at the Opt. Fiber Commun. Conf. Los AngelesCA (2012) JW2A.86.
  17. I. L. Gheorma, G. K. Gopalakrishnan, "Flat frequency comb generation with an integrated dual-parallel modulator," IEEE. Photon. Technol. Lett. 19, 1011-1013 (2007).
  18. A. Goldsmith, Wireless Communications (Cambridge Univ. Press, 2005).
  19. J. Lee, "24-Gb/s transmission over 730 m of multimode fiber by direct modulation of an 850-nm VCSEL using discrete multi-tone modulation," presented at the Opt. Fiber Commun. Conf. Los AngelesCA (2007) PDP 6.

2012

Q. Yang, "Coherent optical DFT-spread OFDM transmission using orthogonal band multiplexing," Opt. Exp. 20, 2379-2385 (2012).

F. Li, "Reducing the peak-to-average power ratio with companding transform coding in 60 GHz OFDM-ROF systems," J. Opt. Commun. Netw. 4, 202-209 (2012).

2011

J. Yu, Z. Dong, N. Chi, "1.96-Tb/s(21 x 100 Gb/s) optical OFDM superchannel generation and transmission over 3200-km SMF-28 with EDFA-only," IEEE Photon. Technol. Lett. 23, 1061-1063 (2011).

2010

J. Yu, "1.2 Tbit/s orthogonal PDM-RZ-QPSK DWDM signal transmission over 1040 km SMF-28," Electron. Lett. 46, 775-777 (2010).

Z. Cao, "Direct-detection optical OFDM transmission system without frequency guard band," IEEE Photon. Technol. Lett. 22, 736-738 (2010).

Y. Tang, W. Shieh, B. S. Krongold, "DFT-Spread OFDM for fiber nonlinearity mitigation," IEEE Photon. Technol. Lett. 22, 1250-1252 (2010).

2008

X. Liu, F. Buchali, "Intra-symbol frequency-domain averaging based channel estimation for coherent optical OFDM," Opt. Exp. 16, 21944-21957 (2008).

W. Shieh, "Coherent optical OFDM: Has its time come?," J. Opt. Netw. 7, 234-255 (2008).

A. J. Lowery, "Amplified-spontaneous noise limit of optical OFDM lightwave systems," Opt. Exp. 16, 860-865 (2008).

2007

I. L. Gheorma, G. K. Gopalakrishnan, "Flat frequency comb generation with an integrated dual-parallel modulator," IEEE. Photon. Technol. Lett. 19, 1011-1013 (2007).

2006

J. Armstrong, A. J. Lowery, "Power efficient optical OFDM," Electron. Lett. 42, 370-372 (2006).

2002

S. Wu, Y. Bar-Ness, "A phase noise suppression algorithm for OFDM-based WLANs," IEEE Commun. Lett. 6, 535-5357 (2002).

1995

C. Muschallik, "Influence of RF oscillators on an OFDM signal," IEEE Trans. Consum. Electron. 41, 592-603 (1995).

Electron. Lett.

J. Yu, "1.2 Tbit/s orthogonal PDM-RZ-QPSK DWDM signal transmission over 1040 km SMF-28," Electron. Lett. 46, 775-777 (2010).

J. Armstrong, A. J. Lowery, "Power efficient optical OFDM," Electron. Lett. 42, 370-372 (2006).

IEEE Commun. Lett.

S. Wu, Y. Bar-Ness, "A phase noise suppression algorithm for OFDM-based WLANs," IEEE Commun. Lett. 6, 535-5357 (2002).

IEEE Photon. Technol. Lett.

Y. Tang, W. Shieh, B. S. Krongold, "DFT-Spread OFDM for fiber nonlinearity mitigation," IEEE Photon. Technol. Lett. 22, 1250-1252 (2010).

J. Yu, Z. Dong, N. Chi, "1.96-Tb/s(21 x 100 Gb/s) optical OFDM superchannel generation and transmission over 3200-km SMF-28 with EDFA-only," IEEE Photon. Technol. Lett. 23, 1061-1063 (2011).

Z. Cao, "Direct-detection optical OFDM transmission system without frequency guard band," IEEE Photon. Technol. Lett. 22, 736-738 (2010).

IEEE Trans. Consum. Electron.

C. Muschallik, "Influence of RF oscillators on an OFDM signal," IEEE Trans. Consum. Electron. 41, 592-603 (1995).

IEEE. Photon. Technol. Lett.

I. L. Gheorma, G. K. Gopalakrishnan, "Flat frequency comb generation with an integrated dual-parallel modulator," IEEE. Photon. Technol. Lett. 19, 1011-1013 (2007).

J. Opt. Commun. Netw.

J. Opt. Netw.

Opt. Exp.

X. Liu, F. Buchali, "Intra-symbol frequency-domain averaging based channel estimation for coherent optical OFDM," Opt. Exp. 16, 21944-21957 (2008).

A. J. Lowery, "Amplified-spontaneous noise limit of optical OFDM lightwave systems," Opt. Exp. 16, 860-865 (2008).

Q. Yang, "Coherent optical DFT-spread OFDM transmission using orthogonal band multiplexing," Opt. Exp. 20, 2379-2385 (2012).

Other

Y. Ma, "1-Tb/s per channel coherent optical OFDM transmission with subwavelength bandwidth access," Proc. Opt. Fiber Commun. Conf. (2009) pp. 1-3.

J. Yu, "Field trial Nyquist-WDM transmission of 8 x 216.4 Gb/s PDM-CSRZ-QPSK exceeding 4 b/s/Hz spectral efficiency," Proc. Opt. Fiber Commun. Conf. (2012) pp. 1-3.

J. Yu, "Generation, transmission and coherent detection of 11.2 Tb/s (112 x 100 Gb/s) single source optical OFDM superchannel," Proc. Opt. Fiber Commun. Conf. (2011) pp. 1-3.

L. Tao, "Generation of flat and stable multi-carriers based on only integrated IQ modulator and its implementation for 112 Gb/s PM-QPSK transmitter," presented at the Opt. Fiber Commun. Conf. Los AngelesCA (2012) JW2A.86.

A. Goldsmith, Wireless Communications (Cambridge Univ. Press, 2005).

J. Lee, "24-Gb/s transmission over 730 m of multimode fiber by direct modulation of an 850-nm VCSEL using discrete multi-tone modulation," presented at the Opt. Fiber Commun. Conf. Los AngelesCA (2007) PDP 6.

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