Abstract: A device and method for optimally estimating the transmission spectrum simultaneously modulates complementary sequences employing a signal transmitter, an encoder, a transmitter having a modulator; a convolver, an antenna, a receiver having a demodulator, and a decoder having an output filter. The device uses complementary sets of sequences, simultaneously transmitted to a physical means, the sum of autocorrelations of which corresponds to a Krönecker delta, allowing the extraction in reception of the spectral and temporal features of the means minimizing the effect of the noise.

Abstract: A device and method for improving the signal to noise ratio by means of complementary sequences, consisting of the use of M complementary sets of sequences, understanding complementary as the sums of their autocorrelations, resulting in a Krönecker delta, the M value coinciding with the number of complementary sets of sequences which are orthogonal to one another, understanding by orthogonal that the sum of the cross-correlations of the complementary sequences of each set is zero.