Investigation of Sparse M-MIMO Channels in Time-Space Correlation Domains in Frequency Division Duplexing

Abstract

Massive Multiple-Input Multiple-Output(M-MIMO) systems are one of the mainstays of the new generation of wireless communications and have the potential to increase data throughput, reduce energy consumption and increase the security of communication lines. In this paper, we intend to investigate channel estimation, which is one of the most common parts of telecommunication systems and is considered as the main cause of disturbance in M-MIMO systems and needs to be compensated. Therefore, first of all, considering that systems with a large number of antennas as well as high bandwidth represent a thin multi-path structure, the sparse domains of M-MIMO systems in frequency, time, angle and we describe the hybrid model of these domains and then we deal with temporal and spatial correlations in this type of channels and finally we simulate the spatial correlation in this type of sparse channels which the results show less pilot overhead is required if using this method.

Keywords: Sparsity, Spatial correlation, Temporal correlation, M-MIMO.