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Why the Modulating signal transmission power is too small

Question asked by hahahaHAN on Feb 26, 2018
Latest reply on Feb 28, 2018 by mhennerich

Hello,

        I use the simulink demo to transmitted 4 QPSK signal.The beginning of this simulink demo is to generate a single tone.

demo

Connecting the Spectrum Analyzer to the AD9361.I can successfully observe the QPSK signal.

4QPSK

But you can see the signal power is too small.Under the same conditions set in the AD9361.4 tone signals power will be much larger.

4_tone_signal

I would like to know what is the reason for the power of the modulated signals are too small.

Thanks.

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