No, you shouldn't use "I." I used to be in graduate school and have never read a single paper which does that.
Scientific efforts typically involve multiple researchers even if only one person is listed as the author, so that's why in most circumstances, it is "we."
I don't think using "I" is proper even if there is really only you alone who is involved, because that sounds too personal for a scientific paper. (Not for political theory papers, where saying "I argue that ...." is totally fine.)
However, note that it is extremely common to use the passive voice in scientific papers. Therefore, when you *have* to say "I did ....", better say "... is done."
"I measured the bit error rate of this modulation scheme and found it to be 10e-3." should be written as:
"The bit error rate of this modulation scheme is measured to be 10e-3."
Of course, in the dedication part of a thesis, feel free to say things like
"I would like to thank [my adviser, wife, etc. ] for ... "
because that's the part where being personal is OK.
But not in the real contents.