Determining the difficulties of massive mımo technology for next generation wireless systems

Next generation wireless communications systems are emerging as new requirements for spectral efficiency and energy efficiency. Many multiple-input multiple-output (MIMO) systems, with dozens or even hundreds of antennas, can provide significant improvements in spectral efficiency, energy efficiency and system reliability. Realistic channel models are indispensable for the design, performance evaluation and optimization of Massive MIMO wireless systems. With this technique, many improvements will be possible. However, Massive MIMO also has some difficulties such as signal processing complexity, size of antenna arrays, etc. for next generation wireless systems. For this reason, this paper is to determine coming challenges and research directions of the intended Massive MIMO system.