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Digital down conversion issue

I have to generate a sine waveform with a initial phase but it has to be reentrant.Since I'm simulating a digital down-conversion, I have to multiply the samples of each symbol with an equal number of samples of a sine wave that has a fixed frequency. So, for each symbol I need that sine waveform starts with the phase with which ends the previous sine waveform( related to previous symbol). Also, since I am simulating a 16 QAM modulation,I need to create a sine and a cosine, but the initial phase of 90 ° out of phase with each other. My problem is that SineWaveform ignores phase if reset signal is false, as in my case.

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