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The Comprehensive Assessment Method for Community Risk Based on AHP and Neural Network

机译:基于AHP和神经网络的社区风险综合评价方法。

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摘要

Carrier frequency synchronization is the critical technique in orthogonal frequency division multiplexing (OFDM) systems. In this paper, an improved carrier frequency offset (CFO) estimation method is proposed, which divides the Schmidlȁ9;s CFO estimation into coarse and fine estimation by using PN sequence iteration, the new method has higher estimation accuracy and larger estimation range than that of Schmidlȁ9;s method in presence of the same computational complexity. The theoretical low bound of CFO estimation is derived by two mathematical methods. The validity of the new algorithm is verified in AWGN and multipath fading channels.
机译:载波频率同步是正交频分复用(OFDM)系统中的关键技术。本文提出了一种改进的载波频率偏移估计方法,该方法通过使用PN序列迭代将Schmidlȁ9; s的CFO估计分为粗略估计和精细估计,该方法具有更高的估计精度和更大的估计范围。 Schmidl 9的方法在计算复杂度相同的情况下。 CFO估计的理论下限是通过两种数学方法得出的。在AWGN和多径衰落信道中验证了新算法的有效性。

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