DIGITAL SIGNAL DEMODULATOR WITH TWO-LEVEL AMPLITUDE-PHASE SHIFT KEYING AND RELATIVE SYMBOL AMPLITUDE ESTIMATION Russian patent published in 2023 - IPC H04L27/38 

FIELD: radio engineering.

SUBSTANCE: invention relates to the field of radio engineering and can be used in digital devices for receiving information signals with multi-position amplitude-phase shift keying (APSK or APSK). The digital signal demodulator with two-level amplitude-phase keying and relative estimation of the symbol amplitude additionally contains a decision generation unit (DGU), a code generator (CG), a quadratic converter (QC), a clock synchronization unit (CSU), a delay unit (DZ), the first (U1) and second (U2) multiplier, third (B3) and fourth (B4) subtractor, trigger (T) and decision device (DD). The first input of the DGU is connected to the output of the digital filter. The first input of the FK is connected to the DGU output, the second input is connected to the RU output, the second T input and the third DGU input, the third input is connected to the second DGU input, the first T input, the BTS output and the second B3input, and the CG output is the demodulator output. The U1 input is connected to the B3output and the first input B4, the output is connected to one input B3. The first input of the CP is connected to the output of the first CCC, the second input is connected to the output of the second CCC, and the output is connected to a common point formed by connecting the first inputs of the DGU, B3, input U2 and another input B3. The second input B4 is connected to the output U2. The first input of the RU is connected to the B3 output, and the second - to the B4 output, and the third - to the T output.

EFFECT: increase in the information transfer rate due to the use of two positions of the symbol amplitude and a simplification of the demodulator implementation that does not require the formation of thresholds for comparing the absolute values of the amplitudes of the received symbols.

1 cl, 9 dwg