The present invention relates to a sequence of channel estimation (is) intended to be emitted by a transmitter (1) to a receiver (2) via a duct (3) so that it can implement a method for estimating the channel, said sequence of the channel estimate is made up of two sequences (s) and g) concatenated respectively, consisting of two complementary sequences (s) and g), said method for estimating the channel, consisting, the transmitter side, to transmit the said sequence of channel estimation and, on the receiver side, a correlation process consisting in correlating the received signal with the first (s) of the complementary sequences, to correct said received signal with the second (g) of the complementary sequences delayed, to add the results of said two correlations, and to deduce the result of the correlation process said characteristics of said channel (3) in the present invention, said two complementary sequences (s) and g) are periodically by the extensions (es f, d and e, f, and d) which constitute the replicas of the part of the start and / or their part of the end and which are respectively concatenated at the end and / or at the beginning of séquence.la present invention also relates to a method for estimating the channel, which uses such a sequence of channel estimation.
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