| General precoder design for mitigation of intercarrier interference in OFDM mobile systems |
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| 作者姓名： | 王霞 朱世华 |
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| 作者单位： | School of Electronics and Information Engineering, Xi＇an Jiaotong University, Xi＇an 710049, China |
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| 基金项目： | 国家自然科学基金;国家高技术研究发展计划(863计划);国家博士基金 |
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| 摘 要： | For orthogonal frequency-division multiplexing （OFDM） communication systems, the frequency offset in mobile radio channels distorts the orthogonality between sub-carriers, which results in Intercarrier Interference（ICI） and seriously degrades the performance of systems. Based on ICI coefficients analysis, a novel preceder design scheme is proposed for mitigation of ICI. In this technique, preceder matrix is designed by the way of linear counteraction and inserted in the former transmitter signal. Computer simulation results show that this new scheme can effectively reduce ICI and significantly provide the carrier-interference power ratio improvement. Compared with existing ICI mitigation schemes with channel estimation, the proposed scheme has lower computational complexity, and compared with self- cancellation scheme, the bandwidth efficiency can be improved in this proposed scheme. The proposed scheme also has better convergence stability for time-varying frequency selective fading channel.
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| 关 键 词： | OFDM移动系统 预编码器 载波间干扰 信道估计 |
| 文章编号： | 1671-8267（2007）01-0046-05 |
General precoder design for mitigation of intercarrier interference in OFDM mobile systems |
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| Wang Xia,Zhu Shihua.General precoder design for mitigation of intercarrier interference in OFDM mobile systems[J].Academic Journal of Xi’an Jiaotong University,2007,19(1):46-50. |
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| Authors: | Wang Xia Zhu Shihua |
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| Abstract: | For orthogonal frequency-division multiplexing(OFDM) communication systems,the frequency offset in mobile radio channels distorts the orthogonality between sub-carriers,which results in Intercarrier Interference(ICI) and seriously degrades the performance of systems.Based on ICI coefficients analysis,a novel precoder design scheme is proposed for mitigation of ICI.In this technique,precoder matrix is designed by the way of linear counteraction and inserted in the former transmitter signal.Computer simulation results show that this new scheme can effectively reduce ICI and significantly provide the carrier-interference power ratio improvement.Compared with existing ICI mitigation schemes with channel estimation,the proposed scheme has lower computational complexity,and compared with self-cancellation scheme,the bandwidth efficiency can be improved in this proposed scheme.The proposed scheme also has better convergence stability for time-varying frequency selective fading channel. |
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| Keywords: | Intercarrier Interference precoder OFDM channel estimation |
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