The energy efficiency (EE) of femtocells is always limited by the surrounding radio
environments in heterogeneous networks (HetNets), such as walls and obstacles. In this …

Intelligent reflecting surface (IRS), consisting of low-cost passive elements, is a promising
technology for improving the spectral and energy efficiency of the fifth-generation (5G) and …

Cell-free (CF) massive multiple-input-multiple-output (MIMO) has emerged as an alternative
deployment for conventional cellular massive MIMO networks. As revealed by its name, this …

Standard cell-free (CF) massive multiple-input-multiple-output (mMIMO) systems is a
promising technology to cover the demands for higher data rates in fifth-generation (5G) …

Motivated by the ever-growing demand for green wireless communications and the
advantages of cell-free (CF) massive multiple-input multiple-output (mMIMO) systems, we …

Due to the impact of amplifier nonlinearities and phase noise, practical transceivers in
heterogeneous networks (HetNets) suffer different degrees of hardware impairments (HWIs) …

Two-way massive MIMO amplify-and-forward relaying systems with non-ideal transceivers
are investigated in this paper. To be general, multiple-antenna nodes and antenna …

Despite the importance of Rayleigh-product multiple-input multiple-output channels and
their experimental validations, there is no work investigating their performance in the …

In this paper, we consider an reconfigurable intelligent surface (RIS)-assisted downlink
cognitive radio system in the presence of hardware impairments (HWIs) and propose an RIS …

Cell-free massive multiple-input-multiple-output (CF-mMIMO) network and its low-complexity
user-centric (UC) alternative rely on accurate and up-to-date channel state information (CSI) …