I am getting the same constellation diagram with each of the filter I have used that is Gaussian 4th order, chebyshev filter 3rd order,bessel filter 4th order, butterworth filter 4th order.
I am using Set OSNR to indroduce noise and its value is 18dB.
After CPE I am getting so close constellation then how one can judge the filter to be used. Actually I am analysing noise so plz help me with the issue why is it so.
I am working on the DP 16-QAM COHERENT RECEIVER.Can anyone help me why my constellations are coming similar.
.
.