METHOD AND APPARATUS FOR GENERATING QUADRATURE AMPLITUDE-SHIFT KEYING SIGNALS Russian patent published in 2013 - IPC H04L7/00 

FIELD: radio engineering, communication.

SUBSTANCE: in-phase component and a quadrature, which are keyed with four information bits, are formed from a pre-generated sinusoidal signal, wherein phases of the in-phase and quadrature components are changed by 180° at values of the first and second information bits r₁-r₂=1, respectively. The in-phase and quadrature components are keyed with the third r₃, fourth r₄ and fifth r₅ information bits based on generation of eight voltage levels for each of the components by multiplying the values of the in-phase and quadrature components keyed with information bits r₁ and r₂ with predetermined corresponding coefficients a, b, c, d, e, f and g, and selecting one voltage level for each component. After keying, the in-phase and quadrature components are summed.

EFFECT: high capacity due to high positionality of the signal structure.

4 cl, 3 dwg