FIELD: communication systems.
SUBSTANCE: invention relates to the field of radio communications and can be used in wireless access systems, land mobile and satellite communications designed to function under restrictions on the allocated frequency resource. In a multichannel spectrally-efficient transmitter with quadrature amplitude-inverse modulation with coherent frequency-code channel separation, M-type amplitude-inverse modulation of nonlinear orthogonal code sequences is carried out. When modulating signals in each information group consisting of m binary symbols, one of them is used to determine the sign of a nonlinear orthogonal code sequence, and the remaining (m-1) symbols determine the amplitude of this sequence. Next, the nonlinear masking sequence is multiplied with the already modulated orthogonal code sequences. As a result of multiplication of these sequences, the structural secrecy of the signal is significantly increased. The resulting sequences obtained in the process of multiplying the nonlinear masking sequence and the modulated nonlinear orthogonal code sequence modulate the quadrature components of the coherent frequency, after which the modulated quadrature components are linearly added.
EFFECT: increase in the spectral efficiency of the communication system while ensuring high structural secrecy.
1 cl, 3 dwg
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