| 基于循环统计量的OFDM信号CFAR检测及参数估计 |
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| 引用本文： | 郭黎利,吴丹,孙志国.基于循环统计量的OFDM信号CFAR检测及参数估计[J].弹箭与制导学报,2009,29(4). |
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| 作者姓名： | 郭黎利 吴丹 孙志国 |
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| 作者单位： | 哈尔滨工程大学信息与通信工程学院,哈尔滨,150001 |
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| 摘 要： | 文中结合OFDM信号二阶循环特性的自身特点,提出一种基于循环统计量的OFDM信号CFAR检测算法.通过采用改进的自相关算法确定特定时延,将协方差估计矩阵由2N维降至2维,避免多维运算的复杂度.并在此基础上,实现了对OFDM符号长度、有用符号时间、循环前缀长度、子载波间隔的盲估计.仿真实验表明,该算法具有较强的抑制加性干扰和乘性干扰的能力;并能在缺乏先验知识的条件下,实现低信噪比下OFDM信号的可靠检测及其参数的有效估计.
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| 关 键 词： | 正交频分复用 CFAR检测 参数估计 循环统计量 |
A CFAR Detection and Parameters Estimation for OFDM Signals Based on Cyclic Cumulants |
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| GUO Lili,WU Dan,SUN Zhiguo.A CFAR Detection and Parameters Estimation for OFDM Signals Based on Cyclic Cumulants[J].Journal of Projectiles Rockets Missiles and Guidance,2009,29(4). |
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| Authors: | GUO Lili WU Dan SUN Zhiguo |
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| Affiliation: | GUO Lili,WU Dan,SUN Zhiguo(College of Information , Communication Engineering,Harbin Engineering University,Harbin 150001,China) |
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| Abstract: | Combining with the special characters of 2-th cyclic cumulants for orthogonal frequency division multiplexing(OFDM) signals,constant false alarm rate(CFAR) test for OFDM presence is proposed particularly.Covariance matrix dimension is descended from 2N to 2,which avoids the complexity of multi-dimensional computation.On the base of this,blind estimations of the symbol period,useful symbol duration,and the length of cyclic prefix and the carrier frequency offset of OFDM can be obtained.Experimental results d... |
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| Keywords: | OFDM CFAR tests parameter estimation cyclic cumulants |
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