Improved DFT-based Channel Estimation in OFDM Systems Based on Phase Compensation

Based on frequency domain pilot channel estimation is a typical technology of channel estimation in OFDM system. In most cases, the pilot configuration of the system can't start from the first subcarrier, which will have an effect on channel estimation values at the pilot, especially in the algorithm of channel estimation based on DFT interpolation which will largely degrade the performance of the algorithm. The study analyses and deduces in detail phase offsets and the compensation technology under the condition of non- integer multiple of the multipath delay and non-integer multiple of the number of pilot. The simulation results show that the proposed phase compensation technology can effectively improve the performance of the channel estimation.

[1]  Matthew C. Valenti,et al.  Iterative channel estimation and decoding of pilot symbol assisted turbo codes over flat-fading channels , 2001, IEEE J. Sel. Areas Commun..

[2]  J.E. Mazo,et al.  Digital communications , 1985, Proceedings of the IEEE.

[3]  Gunther Auer.  Analysis of pilot-symbol aided channel estimation for OFDM systems with multiple transmit antennas , 2004, 2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577).

[4]  Songyu Yu,et al.  Research on an iterative algorithm of LS channel estimation in MIMO OFDM systems , 2004 .

[5]  Zabih Ghassemlooy,et al.  A MIMO-ANN system for increasing data rates in organic visible light communications systems , 2013, 2013 IEEE International Conference on Communications (ICC).

[6]  J.M. Paez-Borrallo,et al.  DFT-based channel estimation in 2D-pilot-symbol-aided OFDM wireless systems , 2001, IEEE VTS 53rd Vehicular Technology Conference, Spring 2001. Proceedings (Cat. No.01CH37202).

[7]  W.H. Tranter,et al.  Simulation of communication systems , 1994, IEEE Communications Magazine.

[8]  Marc C. Necker,et al.  Totally blind channel estimation for OFDM on fast varying mobile radio channels , 2004, IEEE Transactions on Wireless Communications.

[9]  Sirikiat Lek Ariyavisitakul,et al.  Channel estimation for OFDM systems with transmitter diversity in mobile wireless channels , 1999, IEEE J. Sel. Areas Commun..

[10]  Dan Wang,et al.  Robust noise variance and channel estimation for SC-FDE UWB systems under narrowband interference , 2009, IEEE Transactions on Wireless Communications.

[11]  Liang Zhang,et al.  Improved DFT-Based Channel Estimation for OFDM Systems with Null Subcarriers , 2009, 2009 IEEE 70th Vehicular Technology Conference Fall.

[12]  Yang-Seok Choi,et al.  On channel estimation and detection for multicarrier signals in fast and selective Rayleigh fading channels , 2001, IEEE Trans. Commun..

[13]  P. M. Grant,et al.  Digital communications. 3rd ed , 2009 .

[14]  Lihua Li,et al.  A Time Domain Iteration-Based Channel Estimation Method in OFDM Systems with Null Subcarriers , 2010, 2010 IEEE 71st Vehicular Technology Conference.

[15]  Iickho Song,et al.  Performance analysis of a coded OFDM system in time-varying multipath Rayleigh fading channels , 1999 .

[16]  Ye Li.  Pilot-symbol-aided channel estimation for OFDM in wireless systems , 2000, IEEE Trans. Veh. Technol..

[17]  Jong-Tae Lim,et al.  Pilot-symbol aided channel estimation for OFDM with fast fading channels , 2003, IEEE Trans. Broadcast..

[18]  Geoffrey Ye Li,et al.  Simplified channel estimation for OFDM systems with multiple transmit antennas , 2002, IEEE Trans. Wirel. Commun..