| 高速率OFDM系统中的相噪跟踪与抑制 |
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| 引用本文： | 刘光辉,朱维乐.高速率OFDM系统中的相噪跟踪与抑制[J].信号处理,2006,22(2):144-148. |
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| 作者姓名： | 刘光辉 朱维乐 |
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| 作者单位： | 电子科技大学电子工程学院,四川,成都,610054 |
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| 摘 要： | OFDM系统中,本振相位噪声引入两种影响:共同相位误差(CPE)和载波间干扰(ICI)。如果系统传输速率较高,只对相噪引入的CPE进行校正就很难满足系统性能的要求,为此必须对ICI进行抑制。本文在简要分析相噪统计模型和相噪对OFDM系统影响的基础上,提出了一种新的降低ICI影响的方法:在OFDM符号中插入若干相噪估计导频,收端依据导频的失真,用LS方法解卷积求得该符号的相噪参数,然后对相噪引入的CPE和ICI进行抑制。最后通过计算机仿真说明算法的有效性。
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| 关 键 词： | 载波间干扰 共同相位误差 相位噪声 |
| 修稿时间： | 2004年7月16日 |
Tracking and Suppression of Phase Noise in High Data Rate OFDM Systems |
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| Liu Guanghui,Zhu Weile.Tracking and Suppression of Phase Noise in High Data Rate OFDM Systems[J].Signal Processing,2006,22(2):144-148. |
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| Authors: | Liu Guanghui Zhu Weile |
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| Abstract: | In Orthogonal Frequency Division Multiplexing ( OFDM ) systems. the local oscillator phase noise introduces two effects ; common phase error ( CPE) and inter-carrier interference (ICI). The correction of only CPE does not suffice always, especially when high data rates are required. Based on the analysis of phase noise process and its effects on OFDM, a new method of ICI reduction is proposed in this paper. Several phase-noise estimation pilots are inserted in OFDM frames and at the receiver end phase noise is estimated using LS method according to the disturbed pilots. Phase noise suppression is also investigated. Finally, simulation results are shown to demonstrate the effectiveness of the algorithm. |
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| Keywords: | OFDM |
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