An EM-based joint maximum likelihood estimation of carrier frequency offset and channel for uplink OFDMA systems
An EM-based joint maximum likelihood estimation of carrier frequency offset and channel for uplink OFDMA systems
复制标题
上行 OFDMA 系统中基于 EM 的载波频率偏移和信道联合最大似然估计
DOI：
10.1109/vetecf.2004.1400077
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
C.
中科院分区：
文献类型：
--
作者：
Man;S. Tsai;C.
提出了一种基于期望最大化（EM）方法的最大似然估计器（MLE），用于联合估计上行OFDMA系统中每个用户的载波频偏（CFO）和信道。建议MLE区别于现有的方法，其适用于任何任意载波分配方案。所提出的极大似然估计通过将一个多维最大化问题转化为多个小得多的独立最大化问题来实现高的计算效率。计算机实验证实了所提出的估计器在估计精度和对远近效应的鲁棒性方面的有效性。
A maximum likelihood estimator (MLE) based on expectation maximization (EM) method is presented to jointly estimate the carrier frequency offset (CFO) and the channel of each user in uplink OFDMA systems. The proposed MLE distinguishes itself from existing methods by its applicability to any arbitrary carrier assignment schemes. The proposed MLE achieves high computational efficiency by transforming a multidimensional maximization problem into a number of substantially smaller separate maximization problems. Computer experiments have been conducted to confirm the effectiveness of the proposed estimators in estimation accuracy and robustness against the near-far effect.