METHOD FOR SPREADING SIGNALS SPECTRUM Russian patent published in 2020 - IPC H04B1/69 

FIELD: radio engineering and communications.

SUBSTANCE: invention relates to radio engineering and can be used in interference-protected communication systems. Method of expanding the spectrum of signals consists in forming two quasi-orthogonal PRS, synchronizing and information. Information PRS is cyclically shifted relative to the synchronization sequence by the number of elements determined by the transmitted information symbol, and modulo two are combined with an additional information bit. Binary symbols of sequences are replaced by opposite integers. Before and after each element of the converted synchronizing PRS, an additional element is added, which is twice smaller in value, and in the converted information PRS is twice smaller in absolute value and opposite in sign. Sequence of complex numbers is formed, the real part of which is an element of one of the elongated sequences, and the imaginary part is an element of the other. Formed sequence is multiply-by-multiply by a sequence of positive numbers correcting the shape of the signal spectrum, supplemented at the beginning and end with zero elements and its inverse discrete Fourier transformation is performed. Sequences of real and imaginary parts of obtained readings are converted into analogue signals into a DAC, filtered in LPF and modulated by them radio-frequency signal by quadrature method.

EFFECT: high intelligence and resistance to narrow-band interference.

1 cl, 1 dwg