Nguyen Duy Nhat Vien

• Da Nang University of Technology

This study delves into the energy optimization problem in Internet of Things (IoT) networks. We consider the downlink from multiple antenna Gateway (GW) and single antenna IoT devices. For this challenging nonconvex problem, we initially introduced the well-known zero-forcing beamforming (ZFBF) to eliminate inter-user interference, thereby transfor...

This study evaluates the sum‐rate gain of the intelligent reflecting surface (IRS) in a broadcast simultaneous wireless information and power transfer network. Users are equipped with a time‐switching (TS) structure for an alternating information decoder and a nonlinear energy harvester. The sum‐rate maximization (SRM) problem is formulated subject...

This study explores the advantages of employing an unmanned aerial vehicle (UAV) in a massive multiple-input multiple-output (MIMO) network with zero-forcing processing at the base station (BS). Considering potential inaccuracies in channel estimation, we derive a closed-form expression for lower bounds on spectral efficiency in the massive MIMO sy...

Unmanned aerial vehicles (UAVs) are considered to play vital roles in the Sixth Generation (6G) networks and beyond. However, the confidentiality of UAV communication is sensitive to security threats owing to the broadcast nature and principal line-of-sight channel conditions. This paper proposes a three-dimensional (3D) robust beamforming method f...

This paper proposes a power allocation framework based on the per-user quality-of-experience (QoE) conditions for an aerial relay massive MIMO (mMIMO) network, assuming the direct transmission between the mMIMO base station and ground users (UEs) is unavailable. We first derive closed-form spectral efficiency expressions for the mMIMO-based system,...

This paper investigates a multi-input multi-output (MIMO) multi-relay amplify-and-forward (AF) full-duplex (FD) network using optimal joint relay and antenna selection over Rayleigh block fading channels. For system performance analysis, outage probability (OP) is theoretically analyzed to obtain exact and asymptotic expressions of OP where asympto...

This Letter proposed a maximum‐a‐posteriori‐based, pilot‐aided algorithm for iterative estimation of carrier frequency offset (CFO) and time‐varying multiple‐input multiple‐output (MIMO) multipath channel responses in FD orthogonal frequency division multiplexing (OFDM) systems. Empirical results and related benchmark limits show that the proposed...

Internet of Things (IoT) is a smart infrastructure of the unique identification device capable of wireless communication with each other, and human services on a large scale through the Internet. The IoT devices themselves must self-aware and harvest the energy they need from ambient sources. Simultaneous wireless information and power transfer (SW...

Efficient usage of energy resources is a growing concern in today’s communication systems. Energy harvesting is a new paradigm and allows the nodes to recharge their batteries from the environment. In this paper, we focus on the design of optimal linear beamformer for multi- input multi-output (MIMO) simultaneous wireless information and power tran...

In this paper, we focus on the precoding design for sum rate maximization while considering the effects of residual SI for point – to-point multiple input/multiple output (MIMO) Full-Duplex systems. The MMSE-based beamforming algorithm was proposed to cancel the SI. The results shown that, the self-interference cancellation is done by matrix precod...

This paper studies the problem of precoding and postcoding design for multicell multiuser downlink transmissions in the absence of perfect channel state information (CSI). Using statistical information of imperfect CSI, an iterative multiuser multicell transceiver design is formulated by minimizing the mean squared error (MSE) cost function of sign...

This paper is concerned with multiuser downlink transmissions in the presence of inter-cell interference (ICI). In the considered system, precoding at base stations (BS) and postcoding at users are jointly determined to manage both inter-user interference (IUI) and ICI under mean square error (MSE) criterion. Unlike zero-forcing based precoding, th...

This paper presents an analysis of the detrimental effects of carrier frequency offset (CFO), phase noise (PHN) and doubly-selective fading on orthogonal frequency division multiplexing (OFDM) transmission performance. In particular, we derive a closed-form expression for the signal-to-interference ratio (SIR) at an OFDM receiver in the presence of...

This paper studies the detrimental effect of phase noise on the performance of orthogonal frequency division multiplexing (OFDM) transmissions over time-selective channels. In the literature, most of existing papers analyze the performance of OFDM systems in the presence of either time-selective channels or phase noise. Unlike the existing studies,...

This paper studies the problem of multiuser selec-tion in multiple-input multiple-output (MIMO) two-way relay networks. In the literature, existing studies consider multiuser selection for relay networks having homogeneous terminals/users (each is equipped with one antenna). Unlike the existing studies, this paper is concerned with the problem of m...

This paper is concerned with the problem of multiuser precoding design for multiple-output multiple-input (MIMO) two-way relay transmission. In the literature, most of existing studies on multiuser transmission over two-way relay channels have assumed that user terminals (i.e., source nodes) are equipped with a single antenna. To increase the capac...

This paper is concerned with the detrimental effect of phase noise on the performance of orthogonal frequency division multiplexing (OFDM) transmissions over time-selective channels. In the literature, most of the existing papers analyze the performance of OFDM systems in the presence of either time-selective channels or phase noise. Unlike the exi...

The paper studies statistical properties of existing fading channel models in wireless communications. Several statistical characteristics of various fading channel models are numerically verified with related theoretical values. The comparison results can be used as guidelines in selecting suitable fading channel models for a specific wireless sys...