Matrix-monotonic optimization exploits the monotonic nature of positive semi-definite matrices to derive optimal diagonalizable structures for matrix variables matrix-variable problems. Based on derived, associated problems can be substantially simplified and underlying physical insights also revealed. In our work, a comprehensive framework applications matrix-monotonic multiple-input multiple-...

We consider the optimal allocation of resources—power and bandwidth—between training and data transmissions for singleuser time-selective Rayleigh flat-fading channels under the cutoff rate criterion. The transmitter exploits statistical channel state information (CSI) in the form of the channel Doppler spectrum to embed pilot symbols into the transmission stream. At the receiver, instantaneous...

Non-orthogonal multiple access (NOMA) has attracted much recent attention owing to its capability for improving the system spectral efficiency in wireless communications. Deploying NOMA in heterogeneous network can satisfy users’ explosive data traffic requirements, and NOMA will likely play an important role in the fifth-generation (5G) mobile communication networks. However, NOMA brings new t...

There has been extensive research on large scale multi-user multiple-input multiple-output (MUMIMO) systems recently. Researchers have shown that there are great opportunities in this area, however, there are many obstacles in the way to achieve full potential of using large number of receive antennas. One of the main issues, which will be investigated thoroughly in this paper, is timing asynch...

The incorporation of intelligent reflecting surface (IRS) into wireless communication systems can extend the coverage and enhance data transmission rate. This paper studies joint transceiver IRS designs in IRS-assisted multi-input multi-output (MIMO) under both perfect channel state information (CSI) imperfect CSI. Specifically, transmit precoder, reflection coefficients at IRS, receive equaliz...

In this paper, we analyze the outage behavior of decode-and-forward relaying in the context of selective two-way cooperative systems. First, a new relay selection metric is proposed to take into consideration both transmission rates and instantaneous link conditions between cooperating nodes. Afterwards, the outage probability of the proposed system is derived for Nakagami-m fading channels in ...

In this paper, we examine the robust beamforming design to tackle the energy efficiency (EE) maximization problem in a 5G massive multiple-input multiple-output (MIMO)-non-orthogonal multiple access (NOMA) downlink system with imperfect channel state information (CSI) at the base station. A novel joint user pairing and dynamic power allocation (JUPDPA) algorithm is proposed to minimize the inte...

A multiple-input multiple-output wireless communication system is analytically studied, which operates with the aid of a large-scale reconfigurable intelligent surface (LRIS). LRIS equipped multiple passive elements discrete phase adjustment capabilities, and independent Rician fading conditions are assumed for both transmitter-to-LRIS LRIS-to-receiver links. direct transceiver link also consid...

We determine the capacity regions for a class of timevarying multiple-access channels (TVMACs), when the underlying channel state evolves in time according to a probability law which is known to the transmitters and the receiver. Additionally, the transmitters and the receiver have access to varying degrees of channel state information (CSI) concerning the condition of the channel. Discrete-tim...