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


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.