An SNR-Assisted Decision-Directed RCFO Estimation Algorithm for Wireless OFDM Systems

An effect of decision errors on the decision-directed (DD) algorithm for residual carrier frequency offset (RCFO) estimation is analyzed, and a new signal-to-noise ratio (SNR)-assisted DD algorithm is proposed to estimate the RCFO in wireless orthogonal frequency-division multiplexing (OFDM) systems. In the algorithm, the received data on the subchannels with high SNRs are employed in the cross-correlation operation between the adjacent OFDM symbols, and the data of the cross correlation on the subchannels are hard decided. With these decisions and the SNR-weighted factors on the subchannels, the new algorithm estimates the RCFO in high accuracy. The simulation results indicate that the proposed scheme achieves a much better performance than the conventional DD schemes.

[1]  Boualem Boashash,et al.  Mobile unit velocity estimation based on the instantaneous frequency of the received signal , 2004, IEEE Transactions on Vehicular Technology.

[2]  Marc Moeneclaey,et al.  BER sensitivity of OFDM systems to carrier frequency offset and Wiener phase noise , 1995, IEEE Trans. Commun..

[3]  Jong-Wha Chong,et al.  A study of joint tracking algorithms of carrier frequency offset and sampling clock offset for OFDM-based WLANs , 2002, IEEE 2002 International Conference on Communications, Circuits and Systems and West Sino Expositions.

[4]  Jianhua Lu,et al.  A new pilot assisted frequency synchronization for wireless OFDM systems , 2003, 2003 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03)..

[5]  Gregory J. Pottie,et al.  A comparison of frequency offset tracking algorithms for OFDM , 2003, GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489).

[6]  Xiaohu You,et al.  Subspace-based noise variance and SNR estimation for OFDM systems [mobile radio applications] , 2005, IEEE Wireless Communications and Networking Conference, 2005.

[7]  X. You,et al.  Subspace-based noise variance and SNR estimation for MIMO OFDM systems , 2006 .

[8]  Chong Wang,et al.  Novel self-configurable positioning technique for multihop wireless networks , 2005, IEEE/ACM Transactions on Networking.

[9]  Srdjan Capkun,et al.  GPS-free Positioning in Mobile Ad Hoc Networks , 2001, Proceedings of the 34th Annual Hawaii International Conference on System Sciences.

[10]  Heinrich Meyr,et al.  Optimum receiver design for wireless broad-band systems using OFDM. I , 1999, IEEE Trans. Commun..

[11]  S. Boumard,et al.  Novel noise variance and SNR estimation algorithm for wireless MIMO OFDM systems , 2003, GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489).

[12]  Heinrich Meyr,et al.  Optimum receiver design for OFDM-based broadband transmission .II. A case study , 2001, IEEE Trans. Commun..

[13]  Stephen B. Wicker,et al.  On the behavior of communication links of a node in a multi-hop mobile environment , 2004, MobiHoc '04.

[14]  Erchin Serpedin,et al.  Decision-directed fine synchronization in OFDM systems , 2005, IEEE Transactions on Communications.

[15]  Rodger E. Ziemer,et al.  Introduction to digital communication , 1992 .

[16]  Guo Wei,et al.  A novel SNR estimation algorithm for OFDM , 2005, 2005 IEEE 61st Vehicular Technology Conference.

[17]  Yih-Fang Huang,et al.  Pilot assisted synchronization for wireless OFDM systems over fast time varying fading channels , 1998, VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151).

[18]  Ahmed Helmy,et al.  IMPORTANT: a framework to systematically analyze the Impact of Mobility on Performance of Routing Protocols for Adhoc Networks , 2003, IEEE INFOCOM 2003. Twenty-second Annual Joint Conference of the IEEE Computer and Communications Societies (IEEE Cat. No.03CH37428).

[19]  Sayfe Kiaei,et al.  Class of cyclic-based estimators for frequency-offset estimation of OFDM systems , 2000, IEEE Trans. Commun..

[20]  A. Sampath,et al.  Estimation of maximum Doppler frequency for handoff decisions , 1993, IEEE 43rd Vehicular Technology Conference.

[21]  Kaveh Pahlavan,et al.  Modeling of the TOA-based distance measurement error using UWB indoor radio measurements , 2006, IEEE Communications Letters.