Blind joint estimation of carrier frequency offset and I/Q imbalance in OFDM systems
Blind joint estimation of carrier frequency offset and I/Q imbalance in OFDM systems
复制标题
OFDM系统中载波频率偏移和I/Q不平衡的盲联合估计
DOI：
10.1016/j.sigpro.2014.08.015
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发表时间：
2015-03
影响因子：
4.4
通讯作者：
Xingbo Hu
中科院分区：
文献类型：
--
作者：
Weiyang Xu;Yuqing Wang;Xingbo Hu
本文提出了一种不需要任何训练符号或信道侧信息先验知识的正交频分复用（OFDM）系统载波频偏（CFO）和同相/正交（I/Q）不平衡的盲估计方法。该算法背后的关键因素是在许多OFDM系统中普遍存在的零子载波。这种盲联合估计是按顺序进行的，首先估计频率偏移，然后在此基础上进行I/Q不平衡估计。重要的问题包括CFO估计器的可识别性问题，涉及最小化成本函数是否会产生唯一和准确的频率偏移估计，I/Q不平衡估计器的性能分析和复杂性分析。进一步证明了该算法适用于多输入多输出（MIMO）系统。最后给出了数值仿真结果，验证了所提方案的有效性，并与其他现有方法进行了性能比较。
This paper proposes a blind estimator of the carrier frequency offset (CFO) and in-phase/quadrature (I/Q) imbalance in orthogonal frequency-division multiplexing (OFDM) systems, which does not require any prior knowledge of training symbols or channel side information. The key element behind this algorithm is the null sub-carriers commonly existed in many OFDM systems. This blind joint estimation is carried out in a sequential manner that the frequency offset is estimated first and then based on which, the I/Q imbalance estimation is performed. Important issues including the identifiability problem of the CFO estimator involving whether minimizing the cost function would yield a unique and exact estimate of the frequency offset, performance analysis of the I/Q imbalance estimator and complexity analysis are addressed. Furthermore, this algorithm is proved to be applicable in multiple-input multiple-output (MIMO) systems. Finally, numerical simulation results are presented to validate the effectiveness of the proposed scheme and carry out performance comparison with other existing approaches.
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