Low-complexity Integer Frequency Offset Synchronization for OFDMA System

This paper presents a integer frequency offset (IFO) estimation scheme for the 3GPP long term evolution (LTE) downlink system. Firstly, the conventional joint detection method for IFO and sector cell index (CID) information is introduced. Secondly, an IFO estimation without explicit sector CID information is proposed, which can operate jointly with the proposed IFO estimation and reduce the time delay in comparison with the conventional joint method. Also, the proposed method is computationally efficient and has almost similar performance in comparison with the conventional method over the Pedestrian and Vehicular channel models.

Authors:

• Young-Jae Kim
• Young-Hwan You

Keywords:

• LTE
• OFDMA
• primary synchronization signal (PSS)
• IFO
• CID

References:

[1] 3GPP TS 36.211, "Physical channels and modulation," (Release 8),
December 2008.
[2] T.M.Schmidl and D.C.Cox, "Robust frequency and timing synchronization for OFDM," IEEE Trans. Commun., vol. 45, pp. 1613-1621, December 1997.
[3] H. Minn, M.Zeng, and V.K.Bhargava, "On timing offset estimation for
OFDM systems," IEEE Commun. Lett., vol. 4, pp. 242-244, July 2000.
[4] P. Tsai and H.-W. Chang, "A new cell search scheme in 3GPP long term
evolution downlink OFDMA Systems," in Proc. WCSP 2009, pp. 1-5, November 2009.
[5] International Telecommunication Union, "Guidelines for evaluation of
radio transmission technologies for IMT-2000," ITU-R M. 1225-97, 1997.