1IEEE Std.802.16d.Air interface for fixed broadband wire-less access systems.New York:IEEE,2004.
2IEEE P802.16e/D12.Draft IEEE standard for local and metropolitan area networks-Part 16:Air interface for fixed and mobile broadband wireless access systems-Amendment for physical and medium access control layers for combined fixed and mobile operation in licensed bands.New York:IEEE,2005.
3Tonello M,Laurenti N,Pupolin S.Analysis of the uplink of an asynchronous multi-user DMT OFDMA system im-paired by time offsets,frequency offsets,and multi-path fading.In:Proc.Vehicular Technology Conf.Boston,MA:IEEE Press,2000:1094-1099.
4Huang Defeng,Letaief K B.An Interference-cancellation scheme for cartier frequency offsets correction in OFDMA systems.IEEE Trans.Commun.,2005,53(7):1155-1165.
5Fantacci R,Marabissi D,Papini S.Multiuser interference cancellation receivers for OFDMA uplink communications with carrier frequency offset.In:Proc.GLOBECOM.Dallas,TX:IEEE Press,2004:2808-2812.
6Beek J J,Borjesson P O,Boucheret M L,et al.A time and frequency synchronization scheme for multiuser OFDM.IEEE J.Select.Areas Commun.,1999,17(11):1900-1914.
7Morelli M.Timing and frequency synchronization for the uplink of an OFDMA system.IEEE Trans.Communica-tions,2004,52(2):296-306.
8Choi J,Lee C,Jung H W,et al.Carrier frequency offset compensation for uplink of OFDM-FDMA systems.IEEE Commun.Lett.,2000,4(2):414-416.
9Cao Z,Tureli U,Yao Y D.Deterministic multiuser carrier-frequency offset estimation for Interleaved OFDMA uplink.IEEE Trans.Commun.,2004,52(9):1585-1594.
10Zhang Xianda.Matrix Anaysis and Applications.Beijing:Tsinghua University Press,2004.
7World Health Organization. Global nutrition policy review: What does ittake to scale up nutrition action? [M]. Geneva: World Health Organiza- tion, 2013.
8ALLEN L, DARY O, DE BENOIST B. Guidelines of food fortification with micronutfients[J]. Geneva: World Health Organization, 2008.
