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3 ppl on line last time. Elanix in US so number on line depend on your time zone (think many users in US). I use systemview and find useful discussion on wireless comm design and spectral analysis. Get better as more users go (have 80+ now).
Systemview does have full digital IIR design tool. Select analog filter design then pick any type (elliptic, butterworth,...). Result is IIR. Coefficients can then be set to fixed point or any other mode in linear system window. Hope this help.