Signal detection through circular convolution reconstruction for OFDM system in fast varying channel
Hai ZUO1, Xia LEI1, Rongzhen LE1, Maozhu JIN2*
1. National Key Laboratory of Science and Technology on Communications, University of Electronic Science and Technology of China, Chengdu 610054, China ;
2. Business School, Sichuan University, Chengdu 610065, China
Abstract A signal detection algorithm is proposed for the orthogonal frequency division multiplexing (OFDM) system in the presence of fast time-varying channel. The channel is represented by a piece-wise linear variant model with normalized Doppler frequency of less than 0.2. The channel parameters are extracted through ISI/ICI (inter-symbol interference/inter-carrier interference) cancellation and circular convolution reconstruction. Meanwhile, an improved OFDM symbol detection algorithm is also proposed based on circular convolution reconstruction. The channel state information in the OFDM symbol duration can be obtained accurately from the adjacent two block pilots in a linear model. The simulation results show that the proposed method can not only track the channel variation, but also promise better performance gain in the OFDM symbol detection. Furthermore, the bit error ratio (BER) is close to the performance with the perfect channel state information.
This work was supported by the National Natural Science Foundation of China (Nos. 61032002, 71020107027, 71001075, and 60902026), and Chinese Important National Science & Technology Specific Projects (No. 2011ZX03001-007-01).
Cite this article:
Hai ZUO, Xia LEI, Rongzhen LE, Maozhu JIN.Signal detection through circular convolution reconstruction for OFDM system in fast varying channel[J] JMT, 2012,V20(4): 234-242
X. Cai, G.B. Giannakis, Low-complexity ICI suppression for OFDM over time-and frequency-selective Rayleigh fading channels, In: Proc. Asilomar Conf. Signals, Systems and Computers, Minnesota Univ., USA, Nov. 2002: 822-826.
W.G. Jeon, K.H. Chuang, Y.S. Cho, An equalization technique for orthogonal frequency division multiplexing systems in time-variant multipath channels, IEEE Trans. Commun., 1999, 49(1): 1185-1191.
W. Zhang, Y. Guan, W. Liang, et al., An introduction of the Chinese DTTB standard and analysis of the PN595 working modes, IEEE Trans. Broadcast., 2007, 53(1): 8-13.
H. Steendam, Different guard interval techniques for OFDM: performance comparison, In: Proceedings from International Workshop on Multicarrier Spread Spectrum, Herrsching, Germany, May[J]..2007, Vol. 1:11-24
T. Hwang, C. Yang, G. Wu, et al., OFDM and its wireless applications: a survey, IEEE Trans. On Vehicular Technology, 2009, 58(4): 1673-1694.
S. Raza.[J].S. Poompat, Iterative channel estimation using joint zero padding and nonzero padding for TDS-OFDM systems, In: 2010 International Conference on Electrical Engineering/Electronics Computer Telecommunications and Information Technology (ECTI-CON), Chaing Mai, May 19-2.2010,:-
S. Chen, T. Yao, Intercarrier interference suppression and channel estimation for OFDM systems in time-varying frequency-selective fading channels, IEEE Transactions on Consumer Electronics, 2004, 50(2): 429-435.
Z. Li, X. Lei, W. Tang, et al., Channel estimation for OFDM time-variant mulit-path environment, In: IEEE Vehicular Technology Conference, VTC, Nat. Key Lab. of Commun., Univ. of Electron., May 11-14, 2008: 356-360.
Y. Mostofi, D.C. Cox, ICI mitigation for pilot-aided OFDM mobile systems, IEEE Transactions on Wiress Communications, 2005, 4(2): 65-74.
J.M. Holtzman, A. Sampath, Adaptive averaging methodology for handoffs in cellular systems, IEEE Transactions on Vehicular Technology, 1995, 44(1): 59-66.
J.J. Beek, M. Sandell, P.O. Bourjesson, ML estimation of time and frequency offset in OFDM system, IEEE Transactions on Signal Processing, 1997, 45(7): 1800-1805.
C. Jueping, S. Wentao, L. Zan, Doppler spread estimation for mobile OFDM systems in Rayleigh fading channels, consumer electronics, IEEE Transactions on Consumer Electronics, 2003, 49(4): 973-977.
S. Alamouti, Doppler frequency determination for mobile wireless devices, Patent US 2007070554, 2007-11-12.
A. Seyedi, G.J. Saulnier, General ICI self-cancellation scheme for OFDM systems, IEEE Transactions onVehicular Technology, 2005, 54(1): 198-210.
J.H. Ni.[J].Z.M. Liu, A Joint ICI estimation and mitigation scheme for OFDM systems over fast fading channels, In: Global Mobile Congress 2009, Shanghai, Oct. 12-1.2009,:-
Y. Zhao, S.G. Haggman, Intercarrier interference self-cancellation scheme for OFDM mobile communication systems, IEEE Transactions on Commun., 2001, 49(7): 1185-1191.
R. Merched, N. Yousef, Efficient Doppler compensation method and receiver for orthogonal-frequency-division-multiplexing (OFDM) systems, Patent US 20087424062, 2008-09-09.
A.M. Sayeed, B. Aazhang, Joint multipath-Doppler diversity in mobile wireless communications, IEEE Trans on Commun., 1999, 47(1): 123-132.
A. Dammann, On the influence of cyclic delay diversity and Doppler diversity on the channel characteristics in OFDM systems, In: IEEE International Conference on Communications (ICC.07., Glasgow, June 24-28, 2007: 4179-4184.
B.C. Kim, I.T. Lu, Doppler diversity for OFDM wireless mobile communications. part I: frequency domain approach, In: IEEE Vehicular Technology Conference, VTC, South Korea, April 22-25, 2003, Vol. 4: 2677-2681.
X. Ma.[J].G.B. Giannakis, Maximum-diversity trans-missions over time-selective wireless channels, In: Proc. of Wireless Comm. and Networking Conf, March 17-2.2002,:-
J. Wu, Y.R. Zheng, K.B. Letaief, et al., On the error performance of wireless systems with frequency selective fading and receiver timing phase offset, IEEE Transactions on Wireless Communications, 2007, 6(2): 720-729.