Dear Damian,
I have designed the entire system with 4QAM OFDM and optical transmission. Please find attached my design. I have following queries which are mentioned below.
1. What is the meaning of a.u (amplitude) shown in the oscilloscope viewer. Is it equal to volts as 1a.u = 1Volt
2. The voltage value at the output of OFDM block is very high (around 60 a.u). I have attached the screenshot of the same. Please check the file named doubt 2.png. With such a high output my optical modulator goes into saturation, hence I have to connect a 35dB attenuator to it.
Please justify.
3. I want to transmit the OFDM signal with optical up conversion with double sideband full carrier. But I am not getting possible results. Please check and let me know if there are other errors in my design. I want to perform analysis using BER, SER and EVM.
I have been struggling to design this system from quite a long time.