Blocking objects (blockages) between a transmitter and receiver causewireless communication links to transition from line-of-sight (LOS) tonon-line-of-sight (NLOS) propagation, which can greatly reduce the receivedpower, particularly at higher frequencies such as millimeter wave (mmWave). Weconsider a cellular network in which a mobile user attempts to connect to twoor more base stations (BSs) simultaneously, to increase the probability of atleast one LOS link, which is a form of macrodiversity. We develop a frameworkfor determining the LOS probability as a function of the number of BSs, whentaking into account the correlation between blockages: for example, a singleblockage close to the device -- including the user's own body -- could blockmultiple BSs. We consider the impact of the size of blocking objects on thesystem reliability probability and show that macrodiversity gains are higherwhen the blocking objects are small. We also show that the BS density mustscale as the square of the blockage density to maintain a given level ofreliability.
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