N. Kaneda, Q. Yang, X. Liu, S. Chandrasekhar, W. Shieh, Y.-K. Chen, "Real-time
2.5 GS/s coherent optical receiver 53.3-Gbs/s sub-banded OFDM," J. Lightw. Technol. 28, 494-500 (2010).

I.-H. Chung, M.-C. Yen, "On the performance of a maximum
likelihood method with delayed correlation for the coarse carrier frequency
offset estimation of OFDM signals with multiple preamble symbols," Wireless Netw. 16, 641-657 (2010).

A. B. Awoseyila, C. Kasparis, B. G. Evans, "Robust time-domain timing and
frequency synchronization for OFDM systems," IEEE
Trans. Consum. Electron. 55, 391-399 (2009).

F. Yang, Z. Zhang, Y. Chen, "Maximal-likelihood estimator for coarse carrier frequency
offset estimation in OFDM systems," Wireless.
Pers. Commun. 49, 55-66 (2009).

S. L. Jansen, I. Morita, T. C. W. Schenk, H. Tanaka, "121.9-Gb/s PDM-OFDM transmission
with 2-b/s/Hz spectral efficiency over 1000 km of SSMF," J. Lightw. Technol. 27, 177-188 (2009).

A. Sano, E. Yamada, H. Masuda, E. Yamazaki, T. Kobayashi, E. Yoshida, Y. Miyamoto, R. Kudo, K. Ishihara, Y. Takatori, "No-guard-interval coherent optical OFDM
for 100-Gb/s long-haul WDM transmission," J.
Lightw. Technol. 27, 3705-3713 (2009).

S. L. Jansen, B. Spinnler, I. Morita, S. Randel, H. Tanaka, "100 GbE: QPSK versus OFDM," Opt. Fiber Technol. 15, 407-413 (2009).

W. Shieh, Q. Yang, Y. Ma, "107 Gb/s coherent optical OFDM transmission over 1000-km
SSMF fiber using orthogonal band multiplexing," Opt.
Exp. 16, 6378-6386 (2008).

S. L. Jansen, I. Morita, T. C. W. Schenk, N. Takeda, H. Tanaka, "Coherent optical 25.8-Gb/s
OFDM transmission over 4160-km SSMF," J. Lightw.
Technol. 26, 6-15 (2008).

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

G. Ren, Y. Chang, H. Zhang, H. Zhang, "An efficient frequency offset estimation method with a large
range for wireless OFDM systems," IEEE Trans.
Vehic. Technol. 56, 1892-1895 (2007).

X. Yi, W. Shieh, Y. Tang, "Phase estimation for coherent optical OFDM," IEEE Photon. Technol. Lett. 19, 919-921 (2007).

C. Yan, S. Li, Y. Tang, X. Luo, J. Fang, "A
novel frequency offset estimation method for OFDM systems with large estimation
range," IEEE Trans. Broadcast. 52, 58-61 (2006).

W. Shieh, C. Athaudage, "Coherent optical orthogonal
frequency division multiplexing," IET Electron.
Lett. 42, 587-589 (2006).

Z. Zhang, W. Jiang, H. Zhou, Y. Liu, J. Gao, "High
accuracy frequency offset correction with adjustable acquisition range in
OFDM systems," IEEE Trans. Wireless Commun. 4, 228-237 (2005).

S. Attallah, "Blind estimation of residual
carrier offset in OFDM systems," IEEE Signal
Process. Lett. 11, 216-219 (2004).

Z. Zhang, M. Zhao, H. Zhou, Y. Liu, J. Gao, "Frequency
offset estimation with fast acquisition in OFDM system," IEEE Commun. Lett. 8, 171-173 (2004).

H. Minn, V. K. Bhargava, K. B. Letaief, "A robust timing and frequency
synchronization for OFDM systems," IEEE Trans.
Wireless Commun. 2, 822-839 (2003).

T. Keller, L. Piazzo, P. Mandarini, L. Hanzo, "Orthogonal frequency division multiplexing
synchronization techniques for frequency-selective fading channels," IEEE J. Sel. Areas Commun. 19, 999-1008 (2001).

H.-K. Song, Y.-H. You, J.-H. Paik, Y.-S. Cho, "Frequency-offset synchronization
and channel estimation for OFDM-based transmission," IEEE
Commun. Lett. 4, 95-97 (2000).

M. Morelli, U. Mengali, "An improved frequency offset
estimator for OFDM applications," IEEE Commun.
Lett. 3, 75-77 (1999).

J.-J. van de Beek, M. Sandell, P. O. Borjesson, "ML estimation of time and frequency
offset in OFDM systems," IEEE Trans. Signal
Process. 45, 1800-1805 (1997).

T. M. Schmidl, D. C. Cox, "Robust frequency and timing
synchronization for OFDM," IEEE Trans. Commun. 45, 1613-1621 (1997).

M. Luise, R. Reggiannini, "Carrier frequency acquisition
and tracking for OFDM systems," IEEE Trans.
Commun. 44, 1590-1598 (1996).

T. Pollet, M. Van Bladel, M. Moeneclaey, "BER sensitivity of OFDM systems
to carrier frequency offset and Wiener phase noise," IEEE
Trans. Commun. 43, 191-193 (1995).

P. H. Moose, "A technique for orthogonal
frequency division multiplexing frequency offset correction," IEEE Trans. Commun. 42, 2908-2914 (1994).

D. C. Rife, R. R. Boorstyn, "Single-tone parameter estimation
from discrete-time observations," IEEE Trans.
Inf. Theory IT-20, 594-598 (1974).

H.-K. Song, Y.-H. You, J.-H. Paik, Y.-S. Cho, "Frequency-offset synchronization
and channel estimation for OFDM-based transmission," IEEE
Commun. Lett. 4, 95-97 (2000).

T. Pollet, M. Van Bladel, M. Moeneclaey, "BER sensitivity of OFDM systems
to carrier frequency offset and Wiener phase noise," IEEE
Trans. Commun. 43, 191-193 (1995).

A. B. Awoseyila, C. Kasparis, B. G. Evans, "Robust time-domain timing and
frequency synchronization for OFDM systems," IEEE
Trans. Consum. Electron. 55, 391-399 (2009).

M. Morelli, U. Mengali, "An improved frequency offset
estimator for OFDM applications," IEEE Commun.
Lett. 3, 75-77 (1999).

Z. Zhang, M. Zhao, H. Zhou, Y. Liu, J. Gao, "Frequency
offset estimation with fast acquisition in OFDM system," IEEE Commun. Lett. 8, 171-173 (2004).

T. Keller, L. Piazzo, P. Mandarini, L. Hanzo, "Orthogonal frequency division multiplexing
synchronization techniques for frequency-selective fading channels," IEEE J. Sel. Areas Commun. 19, 999-1008 (2001).

X. Yi, W. Shieh, Y. Tang, "Phase estimation for coherent optical OFDM," IEEE Photon. Technol. Lett. 19, 919-921 (2007).

S. Attallah, "Blind estimation of residual
carrier offset in OFDM systems," IEEE Signal
Process. Lett. 11, 216-219 (2004).

M. Luise, R. Reggiannini, "Carrier frequency acquisition
and tracking for OFDM systems," IEEE Trans.
Commun. 44, 1590-1598 (1996).

D. C. Rife, R. R. Boorstyn, "Single-tone parameter estimation
from discrete-time observations," IEEE Trans.
Inf. Theory IT-20, 594-598 (1974).

G. Ren, Y. Chang, H. Zhang, H. Zhang, "An efficient frequency offset estimation method with a large
range for wireless OFDM systems," IEEE Trans.
Vehic. Technol. 56, 1892-1895 (2007).

H. Minn, V. K. Bhargava, K. B. Letaief, "A robust timing and frequency
synchronization for OFDM systems," IEEE Trans.
Wireless Commun. 2, 822-839 (2003).

C. Yan, S. Li, Y. Tang, X. Luo, J. Fang, "A
novel frequency offset estimation method for OFDM systems with large estimation
range," IEEE Trans. Broadcast. 52, 58-61 (2006).

P. H. Moose, "A technique for orthogonal
frequency division multiplexing frequency offset correction," IEEE Trans. Commun. 42, 2908-2914 (1994).

T. M. Schmidl, D. C. Cox, "Robust frequency and timing
synchronization for OFDM," IEEE Trans. Commun. 45, 1613-1621 (1997).

J.-J. van de Beek, M. Sandell, P. O. Borjesson, "ML estimation of time and frequency
offset in OFDM systems," IEEE Trans. Signal
Process. 45, 1800-1805 (1997).

Z. Zhang, W. Jiang, H. Zhou, Y. Liu, J. Gao, "High
accuracy frequency offset correction with adjustable acquisition range in
OFDM systems," IEEE Trans. Wireless Commun. 4, 228-237 (2005).

W. Shieh, C. Athaudage, "Coherent optical orthogonal
frequency division multiplexing," IET Electron.
Lett. 42, 587-589 (2006).

A. Sano, E. Yamada, H. Masuda, E. Yamazaki, T. Kobayashi, E. Yoshida, Y. Miyamoto, R. Kudo, K. Ishihara, Y. Takatori, "No-guard-interval coherent optical OFDM
for 100-Gb/s long-haul WDM transmission," J.
Lightw. Technol. 27, 3705-3713 (2009).

S. L. Jansen, I. Morita, T. C. W. Schenk, N. Takeda, H. Tanaka, "Coherent optical 25.8-Gb/s
OFDM transmission over 4160-km SSMF," J. Lightw.
Technol. 26, 6-15 (2008).

N. Kaneda, Q. Yang, X. Liu, S. Chandrasekhar, W. Shieh, Y.-K. Chen, "Real-time
2.5 GS/s coherent optical receiver 53.3-Gbs/s sub-banded OFDM," J. Lightw. Technol. 28, 494-500 (2010).

S. L. Jansen, I. Morita, T. C. W. Schenk, H. Tanaka, "121.9-Gb/s PDM-OFDM transmission
with 2-b/s/Hz spectral efficiency over 1000 km of SSMF," J. Lightw. Technol. 27, 177-188 (2009).

W. Shieh, Q. Yang, Y. Ma, "107 Gb/s coherent optical OFDM transmission over 1000-km
SSMF fiber using orthogonal band multiplexing," Opt.
Exp. 16, 6378-6386 (2008).

S. L. Jansen, B. Spinnler, I. Morita, S. Randel, H. Tanaka, "100 GbE: QPSK versus OFDM," Opt. Fiber Technol. 15, 407-413 (2009).

I.-H. Chung, M.-C. Yen, "On the performance of a maximum
likelihood method with delayed correlation for the coarse carrier frequency
offset estimation of OFDM signals with multiple preamble symbols," Wireless Netw. 16, 641-657 (2010).

F. Yang, Z. Zhang, Y. Chen, "Maximal-likelihood estimator for coarse carrier frequency
offset estimation in OFDM systems," Wireless.
Pers. Commun. 49, 55-66 (2009).

K. Sathananthan, C. Tellamura, "Performance analysis of an
OFDM system with carrier frequency offset and phase noise," IEEE Proc. VTC 2001, Vehicular Technology Conf. 54th (2001) pp. 2329-2332.

S. Chen, Q. Yang, Y. Ma, W. Shieh, "Multi-gigabit real-time coherent optical OFDM receiver," IEEE Proc. OFC/NFOEC (2009) pp. 1-3.

T. Omiya, H. Goto, K. Kasai, M. Yoshida, M. Nakazawa, "24 Gbit/s, 64 QAM-OFDM coherent transmission with a bandwidth
of 2.5 GHz," IEEE Proc. ECOC (2009).

D. Qian, M.-F. Huang, E. Ip, Y.-K. Huang, Y. Shao, J. Hu, T. Wang, "101.7-Tb/s
(370$\,\times\,$294-Gb/2)
PDM-128 QAM-OFDM transmission over 3$\,\times\,$55-km SSMF using pilot-based phase-noise mitigation," IEEE Proc. OFC/NFOEC (2011) pp. 1-3.

C. Kuo, J.-F. Chang, "Generalized frequency offset estimation
in OFDM systems using periodic training symbol," IEEE
Proc. ICC 2005, Int. Conf. Commun. (2005) pp. 715-719.