| 宽带OFDM系统中的简化滤波查表预失真算法 |
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| 引用本文： | 任智源,韩燕,张海林,郭凯.宽带OFDM系统中的简化滤波查表预失真算法[J].系统工程与电子技术,2010,32(7):1369-1372. |
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| 作者姓名： | 任智源 韩燕 张海林 郭凯 |
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| 作者单位： | (西安电子科技大学综合业务网理论与关键技术国家重点实验室, 陕西 西安 710071) |
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| 基金项目： | 国家自然科学基金，中国博士后科学基金，中央高校基本科研业务费专项资金项目，新世纪优秀人才支持计划，ISN国家重点实验室基金，111工程资助课题 |
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| 摘 要： | 为了解决宽带正交频分复用（orthogonal frequency division multiplexing, OFDM)系统中放大器有记忆非线性特性给系统带来的失真问题，提出了一种简化的滤波查表(simplified filter look up table, S FLUT)预失真方法。该方法由一个无记忆预失真器子系统串联一个自适应滤波器子系统构成，能有效解决放大器带来的失真问题,同时采用简化的自适应更新结构，可以弥补原滤波查表法反馈支路结构复杂、收敛精度低的缺点。
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| 关 键 词： | 记忆性 正交频分复用 自适应滤波器 滤波查表法 |
Simplified filter look-up table method in wideband OFDM system |
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| REN Zhi-yuan,HAN Yan,ZHANG Hai-lin,GUO Kai.Simplified filter look-up table method in wideband OFDM system[J].System Engineering and Electronics,2010,32(7):1369-1372. |
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| Authors: | REN Zhi-yuan HAN Yan ZHANG Hai-lin GUO Kai |
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| Institution: | (State Key Laboratory of Integrated Services Network, Xidian Univ., Xi’an 710071, China) |
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| Abstract: | To solve the problem of distortion caused by power amplifier in memory orthogonal frequency division multiplexing (OFDM) system, a new simplified filter look up table (S FLUT) method is proposed based on the FLUT method. The S FLUT method is composed by a memoryless predistorter subsystem and an adaptive filter subsystem in series. Its updating part is simplified compared to FLUT. The simulation results indicate that the proposed method is less complicated and has higher precision than the original FLUT structure, and can compensate the distortion effectively. |
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| Keywords: | memory orthogonal frequency division multiplexing (OFDM) adaptive filter filter look up table |
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