OFDM Channel Estimation with Impulse Noise Cancellation

Impulse noise is prevalent in urban and indoor radio channels where OFDM system is deployed. In this paper we propose a novel impulse noise cancellation algorithm for OFDM channel estimation under impulse noise. The algorithm first calculates the frequency domain difference on pilot subcarriers between the received signal and the recovered signal from least square channel estimate. Then the difference is used to estimate a sufficient statistics of the impulse components of time domain noise. Finally the impact of the impulsive noise components on the original channel estimation is cancelled to produce a new channel estimate. Simulation results show that our algorithm can improves OFDM channel estimation performance significantly under impulse noise environments.