AM-SSB Modulator模​块出错，无法单独分离​出上下两个边带

AM_SSB Modulator模块无法正确分离出AM_SSB信号上下两个边带，似乎是载波出现了问题，两个载波在示波器中均表现出非正弦失真。

[Adit]

Hi Victoria,

I went through the issue which you are facing regarding the AM-SSB Modulator in Simulink. Could you please share your Simulink model (.slx) file and provide more details about the exact issue you are facing?

Thank you!

Answer 1

[Adit]

Hi Victoria,

I went through the issue which you are facing regarding the AM-SSB Modulator in Simulink. Based on the information shared, it is possible that the issue is related to Hilbert Filter or simulation step size or sampling rate:

• Check the Hilbert Filter: Ensure the Hilbert filter has sufficient order and bandwidth to accurately produce a 90-degree phase shift. Test the Hilbert filter with a known signal (like a sine wave) to confirm it outputs a 90-degree phase-shifted signal.
• Decrease the Step Size: Try setting the simulation step size to a lower value, such as 1e-3 or 1e-4. While this may increase simulation time, it can improve the accuracy of the carrier and the sideband separation.
• Increase the Sampling Rate: Ensure that your sampling rate is at least 10 times higher than the carrier frequency. This helps accurately represent the signal and avoid aliasing.

These steps should help resolve the issue. For further information, refer to below link:

https://www.mathworks.com/help/comm/ref/ssbammodulatorpassband.html

[Dakota]

Hello Adit,

I am also facing the same problem as Victoria. Thanks a lot for your sugesstion, it works for me. However, when I access your link:

geometry dash litehttps://www.mathworks.com/help/comm/ref/ssbammodulatorpassband.html. It doesn't work and shows eccess error, pls fix it. Thanks a lot.