METHOD OF RADIO SIGNAL DEMODULATION WITH PHASE DIFFERENCE MODULATION Russian patent published in 2012 - IPC H04L27/22 

FIELD: information technologies.

SUBSTANCE: invention may be used to transfer discrete information by analog signals along channels, in which amplitude modulation is applied with a suppressed carrier, and data is represented in the form of mutually orthogonal phase-manipulated sinusoidal signals or sets of such signals. In the method of demodulation a radio signal is received at a bearing frequency f₀, its spectrum is transferred to a value equal to the value f₀ into a low-frequency area, then the transferred radio signal is digitised, quadrature components of the transferred digitized radio signal are calculated. Calculation of a radio signal spectrum transfer error is done in accordance with the formula Δf=M₀/2πT, where M₀ is an expected value according to multiple K parcels. The calculated error is memorised, and a shift is compensated when receiving another radio signal made of K parcels at N frequencies, and identification of an information symbol is carried out with account of the value M₀. Besides, actions to determine the expected value of M₀ and Δf are repeated, when another signal arrives from K parcels.

EFFECT: higher noise immunity due to taking into account frequency and phase errors of reference oscillation generation in a receiver and statistical processing of received signals.

2 cl, 5 dwg