Pilot Subset Partitioning Based Integer Frequency Offset Estimation for OFDM Systems With Cyclic Delay Diversity

Cyclic delay diversity (CDD) is a simple transmit diversity technique for coded OFDM systems with multiple transmit antennas. However, high frequency selectivity caused by CDD degrades the performance of post- FFT estimation, i.e., integer frequency offset (IFO). This paper suggests a simple way of improving the performance of the IFO estimator based on the pilot subset partitioning which is designed to reduce the effect of frequency selective fading by adopting the CDD. By partitioning uncorrelated pilot subcarriers into subsets to satisfy high correlation, and performing frequency estimation for each pilot subset, a robust IFO estimation scheme is derived. The simulation results show that the proposed method can provide benefit to the overall system performance .

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

[2]  J.A.C. Bingham,et al.  Multicarrier modulation for data transmission: an idea whose time has come , 1990, IEEE Communications Magazine.

[3]  Armin Dammann,et al.  Standard conformable antenna diversity techniques for OFDM and its application to the DVB-T system , 2001, GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270).

[4]  Fatin Said,et al.  Spectrally efficient transmit diversity scheme for differentially modulated multicarrier transmissions , 2005 .

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

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

[7]  Gunther Auer.  Channel estimation for OFDM with cyclic delay diversity , 2004, 2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754).

[8]  Tung-Sang Ng,et al.  A consistent OFDM carrier frequency offset estimator based on distinctively spaced pilot tones , 2004, IEEE Trans. Wirel. Commun..

[9]  H. Nogami,et al.  A frequency and timing period acquisition technique for OFDM systems , 1995, Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications.

[10]  Gerhard Bauch,et al.  Orthogonal frequency division multiple access with cyclic delay diversity , 2004, ITG Workshop on Smart Antennas (IEEE Cat. No.04EX802).

[11]  John Cosmas,et al.  Diversity Gain for DVB-H by Using Transmitter/Receiver Cyclic Delay Diversity , 2006, IEEE Transactions on Broadcasting.

[12]  Yiyan Wu,et al.  COFDM: an overview , 1995, IEEE Trans. Broadcast..

[13]  Dimitris Toumpakaris,et al.  Approximate maximum likelihood estimation integer carrier frequency offset in OFDM systems , 2005, IEEE International Conference on Communications, 2005. ICC 2005. 2005.

[14]  Jonathan Loo,et al.  Analysis of Cyclic Delay Diversity on DVB-H Systems over Spatially Correlated Channel , 2007, IEEE Transactions on Broadcasting.

[15]  Yong Soo Cho,et al.  A DSFBC-OFDM for a Next Generation Broadcasting System With Multiple Antennas , 2007, IEEE Transactions on Broadcasting.