Modelagem de enlace de comunicações no sistema massivo MIMO Cell-Free para avaliação de desempenho por meio da PEB.

Abstract

Over the past decade, there has been a significant growth in the number of devices connected to the mobile network via wireless links. The demand for high data transfer rates and the increase in the number of devices connected to the network tend to increase and more robust and efficient communications systems should be used. In this perspective, this work presents the statistical modeling of the signal received in the downlink of a massive MIMO cell-free system and the reduction of this model, by means of the Central Limit Theorem of Lyapunov, to a signal model transmitted in a non-selective frequency channel, accompanied by statistical tests and computational evaluations to attest the realized approximations. It is found that, as the number of access points increases, greater is the adherence of the samples corresponding to the desired signal and the samples corresponding to the interference signal to two independent complex Gaussian variables. The reduced model is appropriate for the determination of analytical expressions to Bit Error Probability for any digital modulation scheme and maximum data transfer rate achievable by the system.