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Journal of Zhejiang University SCIENCE A 2008 Vol.9 No.12 P.1676~1684

10.1631/jzus.A0820086


Optimum weighting-coefficient-pair in inter-carrier interference self-cancellation scheme of OFDM system


Author(s):  Min-jian ZHAO, Di ZHANG, Bin CAI

Affiliation(s):  Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   mjzhao@zju.edu.cn, zhangdi417@163.com, cb8322@hotmail.com

Key Words:  Orthogonal frequency division multiplexing (OFDM), Frequency offset, Inter-carrier interference (ICI), Polynomial cancellation coding (PCC), Optimum weighting-coefficient-pair (OWCP)


Min-jian ZHAO, Di ZHANG, Bin CAI. Optimum weighting-coefficient-pair in inter-carrier interference self-cancellation scheme of OFDM system[J]. Journal of Zhejiang University Science A, 2008, 9(12): 1676~1684.

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DOI - 10.1631/jzus.A0820086


Abstract: 
As one of the most important components of the wideband wireless access technique, orthogonal frequency division multiplexing (OFDM) has a high usage rate of spectrum and combats inter-symbol interference (ISI) in multi-path fading channel. However, when there are frequency offsets during the signal transmission, the inter-carrier interference (ICI) is introduced, which significantly degrades the performance. The existing ICI self-cancellation schemes such as PCC-OFDM are not optimum to minimize the interference considering both noise and ICI. In this paper, a new metric named SINR (signal-to-interference-and-noise ratio) is proposed. We discuss the optimization issue when a constant frequency offset exists and in time-varying channels. The optimum weighting-coefficient-pair (OWCP) is obtained, which maximizes SINR theoretically through the alternant iteration algorithm. Simulations show that the performance of OWCP-OFDM is better than that of PCC-OFDM, especially when the frequency offset is large. Although the ICI self-cancellation scheme suffers bandwidth inefficiency, from the simulation results we can also see that the performance of OWCP-OFDM is much better than that of the standard OFDM systems with the same bandwidth efficiency when a frequency offset exists. Moreover, since the redundant modulation provides the capability to suppress ICI as well as a receiving SNR gain, it can be considered as exchanging the bandwidth for SNR.

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Reference

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[3] Armstrong, J., 1999. Analysis of new and existing methods of reducing intercarrier interference due to carrier frequency offset in OFDM. IEEE Trans. on Commun., 47(3):365-369.

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[6] Li, Y., Cimini, L.J.Jr., 2001. Bounds on the interchannel interference of OFDM in time-varying impairments. IEEE Trans. on Commun., 49(3):401-404.

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[8] Robertson, P., Kaiser, S., 1999a. Analysis of the Loss of Orthogonality Through Doppler Spread in OFDM Systems. Proc. GLOBECOM, 1b:701-706.

[9] Robertson, P., Kaiser, S., 1999b. The Effects of Doppler Spreads in OFDM(A) Mobile Radio Systems. Proc. VTC, 1:329-333.

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[11] Zhao, Y.P., Haggman, S.G., 2001. Intercarrier interference self-cancellation scheme for OFDM mobile communication systems. IEEE Trans. on Commun., 49(7):1185-1191.

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