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At millimeter wave (mmWave) frequencies, signals are prone to blocking byobjects in the environment, which causes paths to go from line-of-sight (LOS)to non-LOS (NLOS). We consider macrodiversity as a strategy to improve theperformance of mmWave cellular systems, where the user attempts to connect withtwo or more base stations. An accurate analysis of macrodiversity must accountfor the possibility of correlated blocking, which occurs when a single blockagesimultaneously blocks the paths to two base stations. In this paper, we analyzethe macrodiverity gain in the presence of correlated random blocking andinterference. To do so, we develop a framework to determine distributions forthe LOS probability, SNR, and SINR by taking into account correlated blocking.We consider a cellular uplink with both diversity combining and selectioncombining schemes. We also study the impact of blockage size and blockagedensity. We show that blocking can be both a blessing and a curse. On the onehand, the signal from the source transmitter could be blocked, and on the otherhand, interfering signals tend to also be blocked, which leads to a completelydifferent effect on macrodiversity gains. We also show that the assumption ofindependent blocking can lead to an incorrect evaluation of macrodiversitygain, as the correlation tends to decrease macrodiversity gain.

The Potential Gains of Macrodiversity in mmWave Cellular Networks with Correlated Blocking