TY - GEN
T1 - Optimal training sequences for channel estimation in MIMO OFDM systems in mobile wireless channels
AU - Barhumi, I.
AU - Leus, G.
AU - Moonen, M.
N1 - Publisher Copyright:
© 2001 IEEE.
PY - 2001
Y1 - 2001
N2 - This paper describes a channel estimation and tracking scheme for MIMO OFDM systems based on pilot tones. The mean square error of the proposed scheme is derived, and through this we derive optimal training sequences and placement of the pilot tones. It is shown in this paper that the minimum mean square error (MMSE) is obtained with equispaced pilot tones in frequency, equipowered, orthogonal and phase shift orthogonal training sequences. For channels with large excess delay the number of pilot tones required for training is quite large, though a scheme for channel estimation over multiple blocks is proposed. Through simulations it is shown that the optimal training sequences derived in this paper outperform both the random and orthogonal training sequences which appear to be suboptimal. Moreover, an RLS like method is also proposed to enhance channel estimation.
AB - This paper describes a channel estimation and tracking scheme for MIMO OFDM systems based on pilot tones. The mean square error of the proposed scheme is derived, and through this we derive optimal training sequences and placement of the pilot tones. It is shown in this paper that the minimum mean square error (MMSE) is obtained with equispaced pilot tones in frequency, equipowered, orthogonal and phase shift orthogonal training sequences. For channels with large excess delay the number of pilot tones required for training is quite large, though a scheme for channel estimation over multiple blocks is proposed. Through simulations it is shown that the optimal training sequences derived in this paper outperform both the random and orthogonal training sequences which appear to be suboptimal. Moreover, an RLS like method is also proposed to enhance channel estimation.
KW - Channel Estimation
KW - MIMO Systems
KW - OFDM
KW - Training Sequences
KW - Wireless communication
UR - http://www.scopus.com/inward/record.url?scp=84962264301&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84962264301&partnerID=8YFLogxK
U2 - 10.1109/IZSBC.2002.991787
DO - 10.1109/IZSBC.2002.991787
M3 - Conference contribution
AN - SCOPUS:84962264301
T3 - 2002 International Zurich Seminar on Broadband Communications Access - Transmission - Networking: Meeting the Challenge of High-Speed Communications, IZS 2002 - Proceedings
SP - 44.1-44.6
BT - 2002 International Zurich Seminar on Broadband Communications Access - Transmission - Networking
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - International Zurich Seminar on Broadband Communications Access - Transmission - Networking, IZS 2002
Y2 - 19 February 2002 through 21 February 2002
ER -