Design FDMA using simulink

Hello,

I am working on a FDMA project using Simulink and I am facing technical issues with the following blocks: - Sine Wave (Discrete Time) - Product (BPSK × Carrier) - Bandpass Filter - AWGN Channel

*Problem:* 1. When using AWGN Channel with mode "Signal to Noise Ratio", I get: "Input and output must be discrete when mode set to Signal to Noise Ratio". 2. After the Filter, sometimes complex signals appear causing errors in Integrator or Decision blocks.

*Current settings for User 1 example:* - Sine Wave: Discrete, Sample time = 0.0001 s - Filter: Bandpass, Filter order = 4, Lower passband = 900 Hz, Upper passband = 1100 Hz - Stopband 1 = 800 Hz, Stopband 2 = 1200 Hz, Stopband attenuation = 40 dB - AWGN Channel: Mode = Signal to Noise Ratio

*Goal:* - Run FDMA for two users (User1 = 1 kHz, User2 = 2 kHz) - Avoid any complex signals - Make AWGN Channel work correctly with specified SNR

*Request:* - How to set up the blocks (Sine Wave, Product, Filter, AWGN) so that no complex signals appear and AWGN works correctly? - How to choose the correct Sample time and Filter type for each block?

*Attachments:* - Simulink screenshots - Simulink file (.slx) if possible

Thank you very much for your help.

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