Maximum likelihood inter-carrier interference suppression for wireless OFDM with null subcarriers
Maximum likelihood inter-carrier interference suppression for wireless OFDM with null subcarriers
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DOI：
10.1109/icassp.2005.1415843
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发表时间：
2005-03
期刊：
影响因子：
--
通讯作者：
S. Ohno
中科院分区：
文献类型：
--
作者：
S. Ohno
正交频施加多路复用（OFDM）的传输对频率选择通道具有鲁棒性，但对时间选择通道敏感。通道的时间变化破坏了子载体之间的正交性，从而导致了子载波之间的间载波干扰（ICI）导致大量绩效损失。在本文中，我们提出了一种ViterBi型算法来有效地抑制ICI，通过利用ICI术语的属性和嵌入OFDM符号中的无效子载体，以减少从/到相邻频段的干扰。模拟表明，所提出的均衡器与负担得起的复杂性很好，并且优于线性均衡器。
Orthogonal frequency division multiplexing (OFDM) transmission is robust to frequency-selective channels but sensitive to time-selective channels. Time variations of channels destroys the orthogonality between subcarriers, resulting in a considerable performance loss due to intercarrier interference (ICI) between subcarriers. In this paper, we propose a Viterbi-type algorithm to effectively suppress the ICI, by exploiting the property of ICI terms and null subcarriers embedded in OFDM symbols for the reduction of interferences from/to adjacent bands. Simulations show that the proposed equalizer works well with affordable complexity and outperforms linear equalizers.