Blind Symbol Timing Estimation for Orthogonal Frequency Division Multiplexing Based on Non-Gaussianity Maximization

Blind Symbol Timing Estimation for Orthogonal Frequency Division Multiplexing Based on Non-Gaussianity Maximization
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基于非高斯最大化的正交频分复用盲符号定时估计

DOI:
10.1007/s11277-013-1326-2
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发表时间:
2013-07
影响因子:
2.2
通讯作者:
Xu, Weiyang
Xu, Weiyang
中科院分区:
计算机科学4区
文献类型:
--
作者:
Xu, Weiyang

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提出了一种用于正交频分复用(OFDM)系统的盲符号时序估计器。其基本思想在于,与有时间偏移的情况相比,当离散傅里叶变换窗口的开始被锁定在安全区域时,接收信号在频域内一个OFDM符号内的分布不那么高斯。因此,通过最小化用于测量非高斯性的峰度,实现了符号时序估计。为了在估计精度和计算复杂度之间取得平衡,引入了两步实现。证明了该估计器同样适用于多输入多输出系统,包括基于复用和基于分集的配置。通过数值仿真验证了所提方法的有效性,并在锁相概率和误码率方面与现有盲方案进行了性能比较。
This paper proposes a blind symbol timing estimator for orthogonal frequency-division multiplexing (OFDM) systems. The basic idea lies in that compared to the scenarios with timing offsets, the distribution of the received signal within one OFDM symbol in the frequency domain is less Gaussian when the start of the discrete Fourier transform window is locked into the safe region. Thus via minimizing the kurtosis employed to measure the non-Gaussianity, the symbol timing estimation is achieved. A two-step implementation is introduced to balance between the estimation accuracy and computational complexity. It is proved that this estimator is also applicable in multiple-input multiple-output systems, including multiplexing- and diversity-based configurations. Numerical simulation is carried out to confirm the effectiveness of the proposed method and give the performance comparison with existing blind schemes in terms of the probability of lock-in and bit-error rate.
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