(1) Several quantities in almost all equations are not
described anywhere in the paper.

(2) The reason for the cross-talk is unclear. Why there
should be cross-talk at the input of the amplifiers?
In a MIMO system, cross-talk among antennas at the
output of power amplifiers is much more likely?

(3) A single programmable signal generator should be
sufficient to generate all required signals.

(4) The connections of the measurement setup on
figure 1 are unclear. please draw a clear block diagram
of what is is being done.

