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Impulsive noise is the main electromagnetic disturbance that damages the signal transmission in communication systems. This paper proposes an innovative approach for information signal denoising in time domain. This method is based on the Widrow's adaptive denoising filter. We use this filter in order to reduce the impulsive noise effect when it happens. Our method can be implemented in all communications systems such as PLC, xDSL. In this paper we focus only on PLC systems. Cancelling impulsive noises added to the communication signals has the advantage to make better the Quality of Service (QoS) by diminishing the transmission errors. Simulations results demonstrated that the proposed denoising method is powerful as it successfully cancels the added noises. The method performances are evaluated into a PLC transmission chain compatible with the HomePlug AV standard. We show, in fact, that the amplitude of the Log Likelihood Ratio (LLR) errors before the channel decoder decreases with our method. This results in a better correcting capability for the decoder.