  With the overcrowded sub-6 GHz bands, millimeter wave (mmWave) bands offer a
promising alternative for the next generation wireless standard, i.e., 5G.
However, the susceptibility of mmWave signals to severe pathloss and shadowing
requires the use of highly directional antennas to overcome such adverse
characteristics. Building a network with directional beams changes the
interference behavior, since, narrow beams are vulnerable to blockages. Such
sensitivity to blockages causes uncertainty in the active interfering node
locations. Configuration uncertainty may also manifest in the spectral domain
while applying dynamic channel and frequency assignment to support 5G
applications. In this paper, we first propose a blockage model considering
mmWave specifications. Subsequently, using the proposed blockage model, we
derive a spatial-spectral interference model for dense finite-area 5G mmWave
networks. The proposed interference model considers both spatial and spectral
randomness in node configuration. Finally, the error performance of the network
from an arbitrarily located user perspective is calculated in terms of bit
error rate (BER) and outage probability metrics. The analytical results are
validated via Monte-Carlo simulations. It is shown that considering mmWave
specifications and also randomness in both spectral and spatial node
configurations leads to a noticeably different interference profile.
