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首页> 外文期刊>Journal of computer sciences >A NOVEL TWO STAGE CARRIER FREQUENCY OFFSET ESTIMATION AND COMPENSATION SCHEME IN MULTIPLE INPUT MULTIPLE OUTPUT-ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM USING EXPECTATION AND MAXIMIZATION ITERATION | Science Publications
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A NOVEL TWO STAGE CARRIER FREQUENCY OFFSET ESTIMATION AND COMPENSATION SCHEME IN MULTIPLE INPUT MULTIPLE OUTPUT-ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM USING EXPECTATION AND MAXIMIZATION ITERATION | Science Publications

机译：期望和最大化迭代的多输入多输出正交频分复式系统中的两阶段载波频率偏移估计和补偿方案科学出版物

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> Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM) is a promising technique to handle impairments of multipath channel. Alternatively, one of its major drawbacks is drift in carrier frequency, called Carrier Frequency Offset (CFO). Due to CFO, Inter Carrier Interference (ICI) occurs and results in a large performance degradation. The study proposes a novel two stage CFO estimation and compensation technique based on Expectation and Maximization (EM) algorithm with an iterative scheme. Unlike other CFO estimation algorithm, in our proposed CFO estimator a search interval is computed in two stages, hence the estimated offset is more optimal. In the first stage, coarse CFO estimation is done whereas fine estimation is performed in the second stage. This two stage computation results in more accurate and faster convergent estimate. From the simulation results it is proved that the Bit Error Rate (BER) performance of proposed method is more close to ideal Cramer-Rao Lower Bound (CRLB) curve."
机译： >多输入多输出正交频分复用（MIMO-OFDM）是一种有前途的技术，可以处理多径信道的损伤。另外，它的主要缺点之一是载波频率漂移，称为载波频率偏移（CFO）。由于CFO，会发生载波间干扰（ICI），并导致性能大幅下降。该研究提出了一种新颖的基于期望和最大化算法的两阶段CFO估计和补偿技术，该算法具有迭代方案。与其他CFO估计算法不同，在我们提出的CFO估计器中，搜索间隔是分两个阶段计算的，因此，估计的偏移量更为理想。在第一阶段，进行粗略的CFO估算，而在第二阶段进行精细的估算。这两个阶段的计算导致更准确和更快的收敛估计。从仿真结果可以证明，所提出的方法的误码率（BER）性能更接近理想的Cramer-Rao下界（CRLB）曲线。”

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