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Massive multiple-input multiple-output (MIMO) is now making its way to thestandardization exercise of future 5G networks. Yet, there are stillfundamental questions pertaining to the robustness of massive MIMO againstphysically detrimental propagation conditions. On these grounds, we identifyscenarios under which massive MIMO can potentially fail in Ricean channels, andcharacterize them physically, as well as, mathematically. Our analysis extendsand generalizes a stream of recent papers on this topic and articulatesemphatically that such harmful scenarios in Ricean fading conditions areunlikely and can be compensated using any standard scheduling scheme. Thisimplies that massive MIMO is intrinsically effective at combating interuserinterference and, if needed, can avail of the base-station scheduler forfurther robustness.

Does Massive MIMO Fail in Ricean Channels?