| OFDM系统中的一种低复杂度带状ICI抑制算法 |
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| 引用本文： | 陈东华,仇洪冰. OFDM系统中的一种低复杂度带状ICI抑制算法[J]. 电子科技大学学报(自然科学版), 2011, 40(4): 519-523 |
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| 作者姓名： | 陈东华 仇洪冰 |
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| 作者单位： | 1.华侨大学信息科学与工程学院 福建 厦门 362021; |
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| 基金项目： | 国家自然科学基金(60962001) |
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| 摘 要： | 针对时变信道OFDM系统中的子载波间干扰(ICI)抑制问题,基于时变信道频城响应矩阵(CFR)的带状近似,提出一种低复杂度双迭代均衡方案.通过调整CFR矩阵的带宽大小,有效实现了性能和复杂度之间的良好折中.在检测过程中,首先利用线性ICI抵消降低了由于CFR矩阵的带状近似造成的性能恶化,其次通过迭代软干扰抵消检测算法来...
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| 关 键 词： | 均衡器 子载波间干扰 正交频分复用 时变信道 |
| 收稿时间： | 2009-12-02 |
Low-Complexity Banded ICI Mitigation Scheme for OFDM Systems |
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| Affiliation: | 1.College of Information Science & Engineering,Huaqiao University Xiamen Fujian 362021;2.School of Telecommunications Engineering,Xidian University Xi'an 710071;3.School of Information and Communication,Guilin University of Electronic Technology Guilin Guangxi 541004 |
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| Abstract: | Aiming at mitigating intercarrier interference (ICI) caused by channel time variation in orthogonal frequency division multiplexing (OFDM) systems, a low-complexity doubly iterative equalization scheme is proposed by exploiting the approximately banded structure of channel frequency response (CFR) matrix. The scalability of band size of CFR matrix enables a good tradeoff between performance and complexity. In this scheme, a linear ICI canceller is used to reduce performance degradation caused by the band approximation of CFR matrix, and an iterative equalizer with soft interference cancellation is employed to gain the Doppler diversity induced by channel time variation. Theoretic analysis and simulation results indicate that the proposed technique has both performance and complexity advantages over the classic linear minimum mean square error (MMSE) equalizer in time varying channels. |
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