  In mmWave networks, a large or nearby object can obstruct multiple
communication links, which results in spatial correlation in the blocking
probability between a user and two or more base stations (BSs). This paper
characterizes this blocking correlation and derives its impact on the
signal-to-interference-plus-noise ratio (SINR) of a mmWave cellular network. We
first present an exact analysis of a 1D network and highlight the impact of
blocking correlation in the derived expressions. Gaining insights from the 1D
analysis, we develop an analytical framework for a 2D network where we
characterize the sum interference at the user by considering the correlation
between the blocking of serving and interfering links. Using this, we derive
the SINR coverage probability. Via simulations, we demonstrate that including
blockage correlation in the analysis is required for accurate characterization
of the system performance, in particular when the blocking objects tend to be
large.
