Low-Complexity ICI Suppression Methods Utilizing Cyclic Prefix for OFDM Systems in High-Mobility Fading Channels
Low-Complexity ICI Suppression Methods Utilizing Cyclic Prefix for OFDM Systems in High-Mobility Fading Channels
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DOI：
10.1109/tvt.2013.2278173
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发表时间：
2014-02
影响因子：
6.8
通讯作者：
Chun-Ying Ma;Sheng-Wen Liu;Chia-Chi Huang
中科院分区：
文献类型：
--
作者：
Chun-Ying Ma;Sheng-Wen Liu;Chia-Chi Huang
该文提出了一种简单的载波间干扰（ICI）抑制方案，该方案将循环前缀（CP）中无符号间干扰（ISI）的部分与正交频分复用（OFDM）信号中相应的部分进行线性组合，以消除时变信道引起的ICI效应。与现有的启发式组合权重在文献中的ICI抑制相比，我们推导出三套不同方面的最佳组合权重。通过仿真，我们表明，建议的组合权重优于其他现有的启发式组合权重。此外，一个简化的实现，以减少合并的计算复杂度。此外，所提出的方法可以与其他ICI缓解方法相结合，以进一步提高系统性能。
This paper focuses on a simple intercarrier interference (ICI) suppression scheme that linearly combines the intersymbol interference (ISI)-free part of a cyclic prefix (CP) and its corresponding part in an orthogonal frequency-division multiplexing (OFDM) signal to soothe the ICI effect caused by a time-varying channel. In contrast with existing heuristic combining weights in the literature for ICI suppression, we derived three sets of optimum combining weights in different aspects. Through simulations, we show that the proposed combining weights outperform other existing heuristic combining weights. In addition, a simplified implementation is introduced to reduce the computational complexity of combining. Furthermore, the proposed methods can be incorporated with other ICI mitigation methods to further improve the system performance.