An Improved ICI Self-Cancellation Scheme for Multi-Carrier Communication Systems

For broadband wireless mobile communication systems the orthogonal frequency division multiplexing (OFDM) is a suitable modulation scheme. The frequency offset between transmitter and receiver local oscillator is main drawback of OFDM systems, which causes intercarrier interference (ICI) in the subcarriers of the OFDM system. This ICI degrades the bit error rate (BER) performance of the system. In this paper an improved self-ICI cancellation scheme is proposed to improve the system performance. The proposed scheme is based on discrete Fourier transform-inverse discrete Fourier transform (DFT-IDFT). The simulation results show that there is satisfactory improvement in the bit error rate (BER) performance of the present scheme.

Authors:

• Arvind Kumar
• Rajoo Pandey

Keywords:

• OFDM
• Intercarrier Interference
• InterferenceCoefficients
• DFT based Self-ICI Cancellation.

References:

[1] A.R.S. Bahai, B. R. Saltzberg, Multi-carrier digital communications:
theory and applications of OFDM, Kluwer Academic/Plenum, New
York, 1999.
[2] Yuping Zhao, Sven-Gustav Haggman, "Sensitivity to Doppler Shift and
Carrier Frequency Errors in OFDM Systems: The Consequences and
Solutions," In IEEE 46th Vehicular Technology Conf., Atlanta, GA, Apr.
1996, pp. 1564-1568.
[3] T.Pollet,M.Van Bladel, and M. Moeneciaey, "BER sensitivity of OFDM
system to carrier frequency offset and Wiener phase noise," IEEE Trans.
Commun., vol.43, pp. 191-193, Feb.1995.
[4] P.Moose, "A Technique for orthogonal frequency division multiplexing
offset correction," IEEE Trans. Commun., vol. 42, pp. 2908-2914,
Oct.1994.
[5] Yuping Zhao and Sven-Gustav Häggman, "Intercarrier Interference Self-
Cancellation Scheme for OFDM Mobile Communication Systems,"
IEEE Trans. Commun., vol. 49, No. 7, pp. 1185-1191, July 2001.
[6] Wang Yonggang Zhu Shibua Li Ying, "A Method to Improve the
Bandwidth Efficiency of Self-ICI Cancellation in OFDM Systems," in
International Conf. On Signal Processing, ICSP-02, vol. 2, Aug. 2002,
pp. 1633-1636.
[7] Bing Han, Xiqi Gao et al., "A DFT-based ICI Self-cancellation Scheme
for OFDM Systems," Commun. Technology Proc., ICCT, vol. 2, April
2003, pp. 1359-1362.