J4 ›› 2014, Vol. 41 ›› Issue (4): 87-93.doi: 10.3969/j.issn.1001-2400.2014.04.016

• Original Articles • Previous Articles     Next Articles

Blind estimation algorithm of sampling frequency offset for the OFDM system over multipath channels

LI Bingbing;SUN Jun;LIU Mingqian   

  1. (State Key Lab. of Integrated Service Networks, Xidian Univ., Xi'an  710071, China)
  • Received:2013-01-21 Online:2014-08-20 Published:2014-09-25
  • Contact: LI Bingbing E-mail:bbli@mail.xidian.edu.cn
  • About author:


In order to improve the performance of sampling frequency offset(SFO) estimation for the Orthogonal Frequency Division Multiplexing(OFDM) system in practical non-cooperation communications, this paper proposes a new sampling frequency offset estimation for the OFDM system estimation algorithm  in multipath fading channels and the non-cooperation communications system. The proposed algorithm first uses an improved cycle spectrum to make a coarse estimation of the relative point, and then estimates accurately the relative point through another improved cycle spectrum. Finally, the estimated values of sampling frequency offset are obtained by the rate of change of the phase of the cycle spectrum in the relative point after jumping phase change and least square fitting. Simulation results show that the proposed algorithm has not only higher estimation accuracy but also better performance over multipath channels.

Key words: sampling frequency offset, orthogonal frequency division multiplexing, blind estimation, cycle spectrum, multipath channels