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Pilot Contamination in Small-Cell Massive MIMO Systems

In this paper, we address pilot contamination problem in massive MIMO systems, and investigate the effect of cell size reduction on this phenomenon. While all the effects of noise are removed, the only limiting factor on the performance of massive MIMO systems is pilot contamination. On the other hand, Small Cell Networks are promising design architecture in terms of energy and area spectral efficiency as well as green system design. In this paper, we will show that cell size reduction is also capable of removing the effect of pilot contamination and improves the performnace of massive MIMO technique. In order to investigate the effect of cell size reduction, we will introduce two metrics, worst-case capacity and average capacity. As we will see, in terms of both metrics, cell size reduction provide high capacity gain and therefore, SCN along with massive MIMO technique are potential architecture of future cellualr networks.