Improve Data Rate to Mitigate Pilot Contamination in Small-Cell Massive MIMO Systems

To achieve a high data rate (DR) in the fifth generation (5G), the adaptation of massive multiple-input multiple-output (MIMO) systems with small cells (SCs) is required to improve the performance for energy efficiency. In this paper, we deploy the massive MIMO system with SCs considering the imperfect channel state information by deriving the closed form of the achievable DR in the lower bound by reusing the pilot sequences in time division duplex (TDD). From the simulation result, the DR is achievable depending on a fixed number of users in SC size reduction when the pilot reuse is pair wisely orthogonal.