Comments on “On Favorable Propagation in Massive MIMO Systems and Different Antenna Configurations”

It is shown that the condition of
Theorem 1
in (X. Wu, N. C. Beaulieu, D. Liu, “On favorable propagation in massive MIMO systems and different antenna configurations,”
IEEE Access
, vol. 5, pp. 5578–5593, May 2017) never holds in practice and that
Theorem 2
is incorrect under the stated condition. Extra assumptions or/and modifications are needed to make the conclusions of
Theorem 1
and
2
above valid, which are provided below.