  An analysis of the diversity gain for bit-interleaved coded multiple
beamforming (BICMB) method in millimeter-wave (mm-Wave) massive multiple-input
multiple-output (MIMO) systems is carried out for both the single-user and
multi-user scenario. We show that the diversity gain is independent of the
number of data streams and full spatial multiplexing order can be achieved in
both scenarios. Also, we show that the diversity gain in the multi-user
scenario is independent of the number of users in the system and only depends
on the number of the remote antenna units (RAUs) at the transmitter side, when
each user has only one RAU. The assumption here is that the channel state
information (CSI) is known at both sides of the transmitter and the receiver
and the number of antennas in each RAU goes to infinity. This latter assumption
can be relaxed by a large number of antennas in each RAU, similar to the case
for all massive MIMO research. Based on these assumptions, the diversity gain
for the single-user scenario is
$\frac{\left(\sum_{i,j}\beta_{ij}\right)^2}{\sum_{i,j}\beta_{ij}^2L_{ij}^{-1}}$
where $L_{ij}$ is the number of propagation paths and $\beta_{ij}$ is the large
scale fading coefficient between the $i$th RAU in the transmitter and the $j$th
RAU in the receiver. The diversity gain in the multi-user scenario for the
$k$-th user is $\frac{M^2}{\sum_{j}L_{kj}^{-1}}$ where $M$ represents the
number of RAUs at the transmitter. Simulation results show that when the
perfect channel state information assumption is satisfied, the use of BICMB
results in the diversity gain values predicted by the analysis.
