A novel transmitting diversity scheme for synchronization of OFDM systems

Synchronization is important in order to correctly recover information for multi-antenna orthogonal frequency division multiplexing (OFDM) system. In this paper a novel transmitting diversity scheme named as maximal channel power (MaxCP) is proposed. Specifically the channel state information (CSI) is feedback to transmitter firstly and then only one of transmit antennas with the highest channel power is selected. Thus synchronization sequence is only transmitted at the selected antenna. By simulation, it is found that the proposed MaxCP scheme has the better performance than conventional maximal ratio combining (MRC) scheme, in both timing and frequency synchronization for OFDM systems.

[1]  O. Edfors,et al.  Time and frequency synchronization for OFDM using PN-sequence preambles , 1999, Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324).

[2]  Jianhua Zhang,et al.  Cell search algorithms for the 3G long-term evolution , 2007 .

[3]  T.C.W. Schenk,et al.  Frequency synchronization for MIMO OFDM wireless LAN systems , 2003, 2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484).

[4]  Donald C. Cox,et al.  Robust frequency and timing synchronization for OFDM , 1997, IEEE Trans. Commun..

[5]  Gerhard Fettweis,et al.  Synchronization in OFDM-based WLAN with transmit and receive diversities , 2005, 2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications.

[6]  A. Czylwik.  Synchronization for systems with antenna diversity , 1999, Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324).

[7]  Per Ola Börjesson,et al.  ML estimation of time and frequency offset in OFDM systems , 1997, IEEE Trans. Signal Process..

[8]  Geoffrey Ye Li,et al.  Broadband MIMO-OFDM wireless communications , 2004, Proceedings of the IEEE.

[9]  Volker Jungnickel,et al.  On the value of spatial diversity for the synchronisation in MIMO-OFDM systems , 2005, 2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications.

[10]  Ramjee Prasad,et al.  OFDM for Wireless Multimedia Communications , 1999 .