Research of Suppressing the Co-channel Interference in STC-OFDM with Robust Algorithm Based on Extended Bayesian Filter

Li Yu; Gu Yu-jie; Chen Kang-sheng

doi:10.3724/SP.J.1146.2006.01527

Volume 30 Issue 8

Jan. 2011

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Article Navigation > Journal of Electronics & Information Technology > 2008 > 30(8): 1791-1795

Li Yu, Gu Yu-jie, Chen Kang-sheng. Research of Suppressing the Co-channel Interference in STC-OFDM with Robust Algorithm Based on Extended Bayesian Filter[J]. Journal of Electronics & Information Technology, 2008, 30(8): 1791-1795. doi: 10.3724/SP.J.1146.2006.01527

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Li Yu, Gu Yu-jie, Chen Kang-sheng. Research of Suppressing the Co-channel Interference in STC-OFDM with Robust Algorithm Based on Extended Bayesian Filter[J]. Journal of Electronics & Information Technology, 2008, 30(8): 1791-1795. doi: 10.3724/SP.J.1146.2006.01527

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Research of Suppressing the Co-channel Interference in STC-OFDM with Robust Algorithm Based on Extended Bayesian Filter

doi: 10.3724/SP.J.1146.2006.01527

Received Date: 2006-10-10
Rev Recd Date: 2008-05-20
Publish Date: 2008-08-19

Abstract

Abstract

It is well known that Space-Time Coded Orthogonal Frequency Division Multiplexing (STC-OFDM) is easy to be affected by the Co-Channel Interference (CCI) and it is effective to mitigate CCI by beamforming. However, the existing methods are based on the accurate estimation of source Direction-Of-Arrival (DOA). In fact, the performance of system will degrade significantly when there is error in the estimation of DOA. In this paper, a robust algorithm based on Extended Bayesian(E-Bayesian)filter is proposed to improve the performance of the beamformers with uncertainty or error in desired DOA. In this algorithm, each DOA of desired signal is regarded as a random variable composed by several discrete samples. The posterior probability of these samples will be estimated by Bayesian formula and the samples will be resampled when some posterior probability is under certain threshold. Then, the optimized weights are determined by the posterior probability of these samples. Simulation results show that the proposed algorithm can significantly improve the robustness of the beamformers to combat the co-channel interference over Rayleigh multipath fading channel.

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References

Li Y (Geoffrey) and Sollenberger N R. Adaptive array antennas for OFDM systems with cochannel interference[J].IEEE Trans. on Commun.1999, 47(2):217-229[2]Tarokh V, Seshadri N, and Calderbank A R. Space-time codes for high data rate wireless communication I: Performance criteria and code construction[J].IEEE Trans. on Inform. Theory.1998, 44(3):744-765[3]Li Y, Chuang J C, and Sollenberger N R. Transmitter diversity for OFDM systems and its impact on high-rate data wireless networks[J].IEEE J. Select. Areas Commun.1999, 17(7):1233-1243[4]Choi J and Heath R W. Interpolation based transmit beamforming for MIMO-OFDM with limited feedback[J].IEEE Trans. on Signal Processing.2005, 53(11):4125-4135[5]Peng C H, Lin C C, Lin Y H, and Chi C Y. Blind beamforming for CCI reduction by Kurtosis maximization for OFDM systems in multipath. Proceedings of 2005 International Symposium on Intelligent Signal Processing and Communication Systems, Hong Kong, 2005: 105-108.[6]Li Junqiang, Letaief K B, and Cao Zhigang. Co-channel interference cancellation for space-time coded OFDM systems[J].EEE Trans. on Wireless Commun.2003, 2(1):41-49[7]Van Trees H L. Detection, Estimation, and Modulation Theory, Part I. New York: Wiley, 1968, Chapter 6.[8]Bell K L, Ephraim Y, and Van Trees H L. A Bayesian approach to robust adaptive beamforming[J].IEEE Trans. on Signal Processing.2000, 48(2):386-398[9]Tarokh V, Seshadri N, and Calderbank A R. Space-time codes for high data rate wireless communication I: Performance criteria and code construction[J].IEEE Trans. on Inform. Theory.1998, 44(5):744-765

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