In this paper, we analyze the achievable downlink spectral efficiency of cell-free massive multiple input multiple output (CF-mMIMO) systems, accounting for the effects of channel aging (caused by user mobility) and pilot contamination. We ...

The significant advancement of the internet-of-things has led to a dramatic increase in the number of moving or motionless devices that are connected to the cellular network. For handling such a great number of devices, 5G networks ...

The time-varying nature of the wireless propagation channel under high user mobilities, termed as channel aging, is a major performance impediment in many communication systems. In this paper, we discuss deep learning models for semi-blind channel ...

In this paper, the performance of the cell free Massive multiple-input multiple-output (MIMO) system with realistic channel impairment conditions is discussed. The channel impairment conditions arise due to various issues like the pilot ...

In this paper, energy efficiency (EE) of the frequency division duplexing (FDD) massive multiple-input multiple-output (MIMO) systems in the downlink transmission is investigated by considering the channel aging effect. First, we present a model ...

In this paper, we consider the problem of channel state information (CSI) acquisition in massive MIMO systems with the users exhibiting non-identical channel aging profiles. For this purpose, we derive the per user achievable rates, ...

In time-division duplex (TDD) massive multiple-input multiple-output (MIMO) systems, the spatial multiplexing gain cannot be fully achieved since available pilot resources at each channel coherence time interval are limited. In this paper, we propose an ...