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

FIELD: electrical communication engineering.

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 informing with length M of elements. Two compound sequences consisting of K segments with length M of elements are formed. Each segment of one of them is a cyclic shifted synchronizing PRS, and each segment of the other is a cyclically shifted information PRS. Cyclic shifts of the synchronizing PRS are fixed, and cyclic shifts of the information PRS are determined by K symbols of the transmitted information. Binary symbols of compound sequences are replaced by opposite integers. Sequence of complex numbers is formed, the real part of which is an element of one transformed compound sequence, and the imaginary part is an element of the other. Obtained sequence is element-by-element multiplied by a sequence of real 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 the obtained samples are converted into analogue signals in a DAC, filtered in a low-pass filter and the obtained signals are modulated with a quadrature method of the radio frequency signal.

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

1 cl, 1 dwg