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I created a simple model in Simulink of a quadrature modulator, amplifier and quadrature demodulator. On the oscilloscope(scope in Simulink) and spectrum analyzer the displayed results look normal (at least I think so), but on the constellation diagram I have very low MER, about 15 dB.

Where is mistake?

Block Scheme Source of baseband signal [Quadrature modulator3 [Add noise4 Amplifier Receiver Quadrature demodulator Constellation diagramm

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