| 利用频域检索的单音干扰消除算法 |
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| 引用本文： | 陆炫宇,柏果,程郁凡,唐万斌.利用频域检索的单音干扰消除算法[J].信号处理,2018,34(12):1459-1466. |
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| 作者姓名： | 陆炫宇 柏果 程郁凡 唐万斌 |
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| 作者单位： | 四川九洲电器集团有限责任公司 |
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| 基金项目： | 国家预研项目(9020302，3020103） |
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| 摘 要： | 在正交频分复用（OFDM，Orthogonal Frequency Division Multiplexing）系统中，当每次处理的OFDM符号较少时，OFDM数据子载波上的调制符号将严重影响单音干扰的参数估计。针对这个问题，本文提出一种利用频域检索的单音干扰消除算法。该算法首先利用离散傅里叶变换（DFT，Discrete Fourier Transform）粗估计单音干扰频点，然后通过检索干扰频点附近子载波的调制符号，消除其对单音干扰频域主瓣的影响，提高干扰参数估计精度，从而实现精确的单音干扰重构与消除。仿真结果表明，新算法可以有效地提高单音干扰参数估计精度，并可以降低OFDM系统误码率。
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| 关 键 词： | 单音干扰 正交频分复用 频域检索 |
| 收稿时间： | 2018-07-13 |
Single-tone Interference Cancellation Algorithm Using Frequency Domain Retrieval |
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| Affiliation: | Sichuan Jiuzhou Electric Group Co.,Ltd. |
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| Abstract: | In the OFDM systems, the modulation symbols on the OFDM data subcarriers will seriously affect the parameter estimation of the single-tone interference when there are fewer OFDM symbols to be processed at a time. To solve this problem, this paper proposes a single-tone interference cancellation algorithm using frequency domain retrieval. This algorithm first uses DFT to estimate the single-tone interference frequency points, and then retrieves the modulation symbols of the subcarriers near the interfering frequency point to eliminate the influence on the main lobe of the single-tone interference in frequency domain. It improves the accuracy of interference parameters estimation and realizes accurate reconstruction and elimination of single-tone interference. The simulation results show that the new algorithm can effectively improve the estimation accuracy of the single-tone interference parameters and reduce the error rate of the OFDM systems. |
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