METHOD OF GENERATING SIGNALS WITH A SPREAD SPECTRUM Russian patent published in 2019 - IPC H04L27/20 

FIELD: communication system.

SUBSTANCE: invention relates to anti-jamming communication systems and can be used to generate signals with a spread spectrum. Proposed method consists in generating two quasi-orthogonal PRS – synchronizing and information. Information PRS is cyclically shifted by the number of elements determined by the transmitted information symbol, add modulo of two with an additional information bit and replace binary symbols with opposite numbers. Binary symbols of the synchronizing PRS are also replaced with opposite numbers. Sequence of complex numbers is formed, the real part of which is an element of one transformed PRS, and the imaginary part is an element of the other one. Sequence is supplemented with zero elements to obtain a total number of elements equal to the product K·M, and divided into K segments with length M of elements. Each segment is element-by-element multiplied by elements of a sequence of positive numbers correcting the shape of the signal spectrum, complemented with zero elements at the beginning and end and its inverse discrete Fourier transformation. Sequences of real and imaginary parts of obtained readings are converted into DAC, filtered in low-pass filter and obtained signals are modulated by radio-frequency signal by quadrature method.

EFFECT: technical result is high speed of transmitting information and reconnaissance, low level of out-of-band radiation.

1 cl, 1 dwg