LTE, downlink multiple antenna channel estimation with and without Channel State Information (CSI)
Since crosstalk is not correlated to the signal you want to receive, it's kind of like noise (or more precisely, interference).
So, yeah, that can be part of CSI (but not in the &quot;channel impulse response&quot; sense, but in the &quot;also, SINR&quot; sense).
That SINR estimate might be important for rate adaption and power allocation schemes (e.g. in waterfilling for MIMO).
However, since the crosstalk is something that the handset's designer knows, there's no reason to measure it - it's factory-defined. I don't think I'd call that &quot;calibration&quot; CSI.
Cross-talk estimates are indeed sometimes used in the integrated transceiver ICs for some multicarrier schemes with up- and downlink frequencies with little separation. However, this is kind of done as a countermeasure against analog imperfection, and is of no real relevance to the usage of the transceiver as LTE device – LTE simply sees a higher noise floor in the receiver.
In TDD, the problem typically doesn't arise, due to the fact that it is TDD.