A Novel Pilot Scheme for Frequency Offset and Channel Estimation in 2x2 MIMO-OFDM
Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 33114
A Novel Pilot Scheme for Frequency Offset and Channel Estimation in 2x2 MIMO-OFDM

Authors: N. Promsuwanna, P. Uthansakul, M. Uthansakul

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.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1056797

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1927

References:


[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.