Impulsive Noise Mitigation in Multicarrier Communication for High-Speed Railway

In this paper, a wireless wideband downlink transmission through a multipath and highly time-varying channel is considered for high-speed railway. In this scenario, non-Gaussian noise is generally involved at the receiver side which may lead to communication outage. In previous studies, the optimal receiver algorithms we designed are only applicable for Gaussian noise and time-invariant channels. But for impulsive noise and time-varying multipath channels, new algorithms are needed to be proposed. In order to resolve the issue, a synthesis scheme is proposed in this paper. First, we adopt impulsive noise detection algorithm to discriminate impulsive noise from the received signal. Then the discriminated noise can be suppressed by the blanking algorithm. After that, the refined signal goes through a well-designed beamforming network, which transforms the received signal with varying frequency offsets into an angle domain. Thus, the frequency offset in each angle is near-constant which can be accurately estimated. The simulation results indicate that the proposed scheme significantly improves the reliable performance of the high-speed railway communication systems.