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一种基于相关序列的OFDM频偏估计算法

Keywords: 正交频分复用,频偏估计,定时偏移,相关序列

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Abstract:

提出了一种改进的整数倍频偏估计算法,此算法基于已知频域前导序列及其共轭移位序列的Hadamard积构建一个具有良好自相关性能的相关序列,再利用相关运算估计频偏.利用蒙特卡洛仿真方法,分析了新算法的测度函数在高斯白噪声信道条件下的均值和方差分布特性.将新算法应用于IEEE802.16d系统中进行仿真,结果表明,该算法能够克服大定时偏移带来的影响,在信噪比大于10dB时具有精确的整数倍频偏检测概率,且算法复杂度没有明显提高.

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