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In this paper, the authors propose an efficient Carrier Frequency Offset (CFO) estimation technique based on the Space Alternating Generalized Expectation-maximization (SAGE) for uplink Orthogonal Frequency Division Multiple Access (OFDMA) systems. In general, the SAGE method transforms a multidimensional search problem into a sequence of one-dimensional searches, which greatly simplifies the estimation procedure. However, the conventional algorithms based on the SAGE method require a large amount of computations to estimate the CFO due to exhaustive grid search.
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