METHOD OF GENERATING QUADRATURE AMPLITUDE-SHIFT KEYING SIGNALS Russian patent published in 2014 - IPC H04L27/36 

FIELD: radio engineering, communication.

SUBSTANCE: in the method of generating quadrature amplitude-shift keying signals, an incoming information bit stream is divided into blocks of four bits each. A sinusoidal signal is then generated, from which initial values of voltage of in-phase u^I and quadrature u^Q components are generated, which are keyed depending on the values of the first r₁, second r₂, third r₃ and fourth r₄ bits of the information bit stream. For values of r₁ and r₂, equal to one, the phases of u¹ and u^Q are changed by 180°. If r₃=1, and r₄=0, then as a result of keying u¹ is multiplied by sin75°, and u^Q is multiplied by cos75°, if r₃=0, and r₄=1, then u^I is multiplied by sin15°, and u^Q is multiplied by cos15°, if r₃=0 and r₄=0, then u^I is multiplied by sin45°, and u^Q is multiplied by cos45°, if r₃=1 and r₄=1, then u^I and u^Q are reduced threefold from the initial value. The keyed in-phase and quadrature components are then summed.

EFFECT: reduced peak factor value of the generated quadrature amplitude-shift keying signal structure by reducing differences in amplitude values of signal constellation vectors, which improves noise-immunity.

2 dwg