Information security has always been a critical issue in wireless networks. Apart from other
secure techniques, covert communication emerges as a potential solution to security for …

As an emerging system architecture, heterogeneous cloud radio access networks (H-
CRANs) can improve system capacity, enlarge coverage, and enhance energy/spectral …

Ambient backscatter technology that utilizes the ambient radio frequency signals to enable
the communications of battery-free devices has attracted much attention recently. In this …

The availability of perfect channel state information is assumed in current ambient-
backscatter studies. However, the channel estimation problem for ambient backscatter is …

In this paper, we develop a unified framework for IRS-aided transceiver designs under
general power constraints in multiple-input multiple-output (MIMO) systems which implement …

Unmanned aerial vehicle (UAV) communications play an important role in building the
space-air-ground network and realizing the seamless wide-area coverage thanks to its long …

This paper investigates the performance of massive multiple-input multiple-output (MIMO)
cellular systems with pilot contamination. We derive a closed-form approximation of the area …

Federated learning (FL) over mobile networks has attracted intensive attention recently.
User mobility is a fundamental feature of mobile networks, which leads to dynamic network …

Intelligent reflecting surface (IRS) is an emerging cost-efficient technology to enhance
communication performance by implementing a large number of passive reflecting elements …

Matrix-monotonic optimization exploits the monotonic nature of positive semi-definite
matrices to derive optimal diagonalizable structures for the matrix variables of matrix …