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OFDM (Orthogonal Frequency Division Multiplexing) is the modulation scheme that is widely used in broad band power line communication (PLC). In OFDM transmission, impulsive noise is one of the major factors that limits the performance of PLC systems. In order to sufficiently reduce the influence of impulsive noise, precise estimation of channel transfer function is necessary. In this paper, the estimation scheme of channel transfer function under existence of additive impulsive noise is proposed. In the proposed scheme, successive two pilot OFDM symbols are used for reduction of the influence of impulsive noise. As the results, it is possible to perform precise estimation of channel transfer functions.

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OFDM (Orthogonal Frequency Division Multiplexing) modulation scheme is widely used in high speed communication systems. In OFDM system, one of the main problems is the influence of impulsive noise that has very large magnitude and short time duration. It causes significant degradation of the transmission performance. Therefore, an appropriate measure to reduce the influence of impulsive noise is required. In order to reduce the influence of the impulsive noise effectively, precise estimation of transmission channel is necessary. However, the pilot symbols for channel estimation are also affected by impulsive noise. We have already proposed the scheme for channel estimation under these situations using the pilot symbols inserted in two successive OFDM symbols. However, data transmission performance degrades because two successive OFDM symbols are used for channel estimation. In this paper, channel estimation scheme using only one OFDM symbol for channel estimation is proposed. As the results of simulations, possibility of precise channel estimation was confirmed.