Changha Yu

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In this paper, carrier frequency offset (CFO) estimation schemes robust to the non-Gaussian noise for orthogonal frequency division multiplexing (OFDM) systems are proposed. Applying the probability density function of the cyclic prefix of OFDM symbols to the maximum-likelihood (ML) criterion, we propose the ML and low-complexity ML estimation schemes.(More)
In this paper, the frequency offset estimation schemes robust to the non-Gaussian noise for orthogonal frequency division multiplexing (OFDM) systems are addressed. First, a maximum-likelihood (ML) estimation scheme in non-Gaussian noise is proposed, and then a simpler estimation scheme based on the ML estimation scheme is presented. Numerical results show(More)
In this paper, we propose an enhanced code acquisition scheme for optical code division multiple access (CDMA) systems. By using multiple thresholds, the proposed scheme provides a shorter mean acquisition time (MAT) than that of the conventional multiple-shift (MS) scheme. The simulation results demonstrate that the MAT of the proposed scheme is shorter(More)
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