On the Design of an Elegant CFO Estimate System with the Assistance of Pilots for OFDM Transmission

We present an improved line search method of the carrier frequency offset (CFO) estimate technique for OFDM systems aided with pilots. Unlike the conventional approaches, prior knowledge of channel order is unnecessary for the presented scheme, because we apply an interpolation technique for obtaining the extended channel frequency response. The search mechanism of the proposed approach is primarily based on the criterion that CFO can be found by discovering the frequency that achieves the minimum value of the well-defined channel residual energy. In addition, we substitute the line search method with an iterative approach to reduce the proposed estimator’s complexity. Analytical and simulation results have been conducted to verify the efficacy of the proposed schemes in this paper.

[1]  Umberto Mengali,et al.  Carrier-frequency estimation for transmissions over selective channels , 2000, IEEE Trans. Commun..

[2]  Chih-Peng Li,et al.  Subspace-Based Semi-Blind Channel Estimation in Uplink OFDMA Systems , 2010, IEEE Transactions on Broadcasting.

[3]  Yik-Chung Wu,et al.  Joint CFO and Channel Estimation for OFDM-Based Two-Way Relay Networks , 2011, IEEE Transactions on Wireless Communications.

[4]  See-May Phoong,et al.  OFDM Channel Estimation in the Presence of Receiver I/Q Imbalance and CFO Using Pilot Symbols , 2012, IEICE Trans. Commun..

[5]  Umberto Mengali,et al.  An improved frequency offset estimator for OFDM applications , 1999, IEEE Communications Letters.

[6]  Yonghong Zeng,et al.  Robust subspace blind channel estimation for cyclic prefixed MIMO ODFM systems: algorithm, identifiability and performance analysis , 2008, IEEE Journal on Selected Areas in Communications.

[7]  Kevin Buckley,et al.  Performance analysis of the MVDR spatial spectrum estimator , 1995, IEEE Trans. Signal Process..

[8]  Umberto Mengali,et al.  Frequency ambiguity resolution in OFDM systems , 2000, IEEE Communications Letters.

[9]  Jintao Wang,et al.  Spectrum- and Energy-Efficient OFDM Based on Simultaneous Multi-Channel Reconstruction , 2013, IEEE Transactions on Signal Processing.

[10]  Marco Luise,et al.  Carrier frequency recovery in all-digital modems for burst-mode transmissions , 1995, IEEE Trans. Commun..

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

[12]  Hao Wang,et al.  Maximum likelihood estimation of OFDM carrier frequency offset , 2002, 2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333).

[13]  Paul H. Moose,et al.  A technique for orthogonal frequency division multiplexing frequency offset correction , 1994, IEEE Trans. Commun..

[14]  Tao Jiang,et al.  Properties and Power Spectral Densities of CP Based OQAM-OFDM Systems , 2015, IEEE Transactions on Signal Processing.

[15]  Yong Hoon Lee,et al.  Least squares frequency estimation in frequency-selective channels and its application to transmissions with antenna diversity , 2001, IEEE J. Sel. Areas Commun..

[16]  Michael D. Zoltowski,et al.  OFDM blind carrier offset estimation: ESPRIT , 2000, IEEE Trans. Commun..

[17]  Jin-Fu Chang,et al.  Noniterative Joint Frequency Offset and Channel Estimation for MIMO OFDM Systems Using Cascaded Orthogonal Pilots , 2010, IEEE Transactions on Vehicular Technology.

[18]  Khaled Ben Letaief,et al.  Carrier frequency offset estimation for OFDM systems using null subcarriers , 2006, IEEE Transactions on Communications.

[19]  Jiunn-Tsair Chen,et al.  A low-complexity space-time OFDM multiuser system , 2005, IEEE Transactions on Wireless Communications.

[20]  Desmond P. Taylor,et al.  The effect of diversity on a burst-mode carrier-frequency estimator in the frequency-selective multipath channel , 1998, IEEE Trans. Commun..