[Paper] Efficient Channel Estimation Scheme under Impulsive Noise Environment

Abstract

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.