A Novel Pilot Scheme for Frequency Offset and Channel Estimation in 2x2 MIMO-OFDM
The Carrier Frequency Offset (CFO) due to timevarying
fading channel is the main cause of the loss of orthogonality
among OFDM subcarriers which is linked to inter-carrier interference
(ICI). Hence, it is necessary to precisely estimate and compensate the
CFO. Especially for mobile broadband communications, CFO and
channel gain also have to be estimated and tracked to maintain the
system performance. Thus, synchronization pilots are embedded in
every OFDM symbol to track the variations. In this paper, we present
the pilot scheme for both channel and CFO estimation where channel
estimation process can be carried out with only one OFDM symbol.
Additional, the proposed pilot scheme also provides better
performance in CFO estimation comparing with the conventional
orthogonal pilot scheme due to the increasing of signal-tointerference
ratio.
[1] W. Hwang, H. Kang, and K. Kim, "Sensitivity of SNR degradation of
OFDM to carrier frequency offset in shadowed two-path channels,"
IEICE Trans. Commun., vol. E86-B, pp. 3630-3633, Dec. 2003.
[2] P. H. Moose, "A technique for orthogonal frequency division
multiplexing frequency offset correction," IEEE Trans. Commun., vol.
42, pp. 2908-2914, Oct. 1994.
[3] Z. Zhang, J. Liu, C. Wang, K. Sohraby and Y. Liu, "Joint frame
synchronization and carrier frequency offset estimation in OFDM
systems," 2005 IEEE EIT Int. conf., pp. 1-5, May 2005.
[4] J. van de Beek, M. Sandell, and P. O. Borjesson, "ML estimation of
timeand frequency offset in OFDM systems," IEEE Trans. Signal
Processing, vol. 45, pp. 1800-1805, July 1997.
[5] F. Classen and H. Meyr, "Frequency synchronization algorithms for
OFDM systems suitable for communication over frequency selective
fading channels," in Proc. IEEE VTC'94, pp. 1655-1659, Jun . 1994.
[6] X. Fu and H. Minn, "Modified data-pilot-multiplexed schemes for
OFDM systems," IEEE Trans. Wireless Commn., vol. 6, pp. 730-737,
Feb. 2007.
[7] W. Zhang, X. Xia and P.C. Ching, "Clustered pilot tones for carrier
frequency offset estimation in OFDM systems," IEEE Trans. Wireless
Commn., vol. 6, pp. 101-109, Jan. 2007.
[8] Y. Qiao, S. Yu, P. Su and L. Zhang, "Research on an iterative algorithm
of LS channel estimation in MIMO OFDM systems," in Proc. IEEE
CASSET 2004, pp. 729-732, May 2004.
[9] Z. Wang and S. S. Abeysekera, "Frequency estimation using the
pulsepair method in different fading enviroments," in Proc. IEEE
ICASSP 2003, vol. 4, pp. 517-520.
[1] W. Hwang, H. Kang, and K. Kim, "Sensitivity of SNR degradation of
OFDM to carrier frequency offset in shadowed two-path channels,"
IEICE Trans. Commun., vol. E86-B, pp. 3630-3633, Dec. 2003.
[2] P. H. Moose, "A technique for orthogonal frequency division
multiplexing frequency offset correction," IEEE Trans. Commun., vol.
42, pp. 2908-2914, Oct. 1994.
[3] Z. Zhang, J. Liu, C. Wang, K. Sohraby and Y. Liu, "Joint frame
synchronization and carrier frequency offset estimation in OFDM
systems," 2005 IEEE EIT Int. conf., pp. 1-5, May 2005.
[4] J. van de Beek, M. Sandell, and P. O. Borjesson, "ML estimation of
timeand frequency offset in OFDM systems," IEEE Trans. Signal
Processing, vol. 45, pp. 1800-1805, July 1997.
[5] F. Classen and H. Meyr, "Frequency synchronization algorithms for
OFDM systems suitable for communication over frequency selective
fading channels," in Proc. IEEE VTC'94, pp. 1655-1659, Jun . 1994.
[6] X. Fu and H. Minn, "Modified data-pilot-multiplexed schemes for
OFDM systems," IEEE Trans. Wireless Commn., vol. 6, pp. 730-737,
Feb. 2007.
[7] W. Zhang, X. Xia and P.C. Ching, "Clustered pilot tones for carrier
frequency offset estimation in OFDM systems," IEEE Trans. Wireless
Commn., vol. 6, pp. 101-109, Jan. 2007.
[8] Y. Qiao, S. Yu, P. Su and L. Zhang, "Research on an iterative algorithm
of LS channel estimation in MIMO OFDM systems," in Proc. IEEE
CASSET 2004, pp. 729-732, May 2004.
[9] Z. Wang and S. S. Abeysekera, "Frequency estimation using the
pulsepair method in different fading enviroments," in Proc. IEEE
ICASSP 2003, vol. 4, pp. 517-520.
@article{"International Journal of Electrical, Electronic and Communication Sciences:51410", author = "N. Promsuwanna and P. Uthansakul and M. Uthansakul", title = "A Novel Pilot Scheme for Frequency Offset and Channel Estimation in 2x2 MIMO-OFDM", abstract = "The Carrier Frequency Offset (CFO) due to timevarying
fading channel is the main cause of the loss of orthogonality
among OFDM subcarriers which is linked to inter-carrier interference
(ICI). Hence, it is necessary to precisely estimate and compensate the
CFO. Especially for mobile broadband communications, CFO and
channel gain also have to be estimated and tracked to maintain the
system performance. Thus, synchronization pilots are embedded in
every OFDM symbol to track the variations. In this paper, we present
the pilot scheme for both channel and CFO estimation where channel
estimation process can be carried out with only one OFDM symbol.
Additional, the proposed pilot scheme also provides better
performance in CFO estimation comparing with the conventional
orthogonal pilot scheme due to the increasing of signal-tointerference
ratio.", keywords = "MIMO, OFDM, carrier frequency offset, channel,
estimation.", volume = "7", number = "2", pages = "113-5", }