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Thanks alistu for your valuable reply 🙂
Actually I am not implementing any paper I am to generate a DPSK(BPSK) signal for Analog to digital conversion and then again convert it to analog and detect. This is my class project. I have used the builtin DPSK modulator present in Optisystem 13 for this purpose but after DAC conversion the signal loses its phase change. My supervisor suggest me to design my own DPSK modulator and demodulator for this purpose. Now I have made the circuit as you suggested but it dont show output after XNOR gate. I found the design at the site given below. My .osd file is also attached Kindly Help. Thanks
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