The invention relates to a channel estimating method in an orthogonal frequency division multiplexing (OFDM) system transmitting signals over said channel, wherein an OFDM symbol of each of said signals has at least one null subcarrier set in its defined bandwidth, According to the invention, said method comprises the following steps: - obtaining at least one initial channel estimate over at least one OFDM symbol of a received signal; - processing said at least one initial channel estimate for delivering at least one soft information in a form of a complete matrix; - improving said at least one initial channel estimate by performing a truncated singular value decomposition of a partial FFT matrix, wherein said partial FFT matrix comprises only the first LDP columns and the rows NDP of an FFT matrix of said complete matrix, said NDP rows corresponding to modulated subcarriers of received signal, including data and pilot symbols and excluding said at least one null subcarrier, delivering an improved channel estimate.
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