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UMTS filter coefficient in the IIO oscilloscope

Question asked by smunaut on May 19, 2018
Latest reply on May 21, 2018 by travisfcollins

I saw that the IIO oscilloscope tool contains a set of UMTS filter coefficient and I'm wondering how they've been generated ?
The ADI9361 filter design tool seems to have RRC disabled (and also just consistently crashes on my machine but that's most likely just Matlab itself ...).

When I attempt to generate my own taps, I get either a slightly worse EVM or a slightly better one depending on exactly how I end up using them (even though in my mind it mathematically shouldn't change anything, see http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/2018-May/056617.html ).

So I'm assuming some "tricks" were using when creating them ?

 

Cheers,

 

    Sylvain

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