Method and system for pulse noise suppression, in an ofdm - system

摘要

An impulse noise rejection system (1400, 1600) for an orthogonal frequency division multiplexing (OFDM) communications system and related methods are disclosed. The impulse noise rejection system (1400, 1600) detects presence of impulse noise in an OFDM symbol in time domain, and compensates for the impulse noise in frequency domain. Impulse noise corrupted OFDM symbol is "down-converted" such that the impulse noise component of the FFT output is a slow-varying waveform. Impulse noise at all subcarriers is estimated by interpolating the estimated impulse noise at pilot subcarriers in the slow-varying waveform. Impulse noise free FFT output is obtained using the estimated impulse noise and an "up-converting" process. The apparatus and algorithm for optimizing the down-converting frequency and up-converting frequency are described.