30 citations · 69 across the 21 of their papers we have counts for
22 papers
Joint UAV Placement and IRS Phase Shift Optimization in Downlink Networks
Hung Nguyen-Kha, Hieu V. Nguyen, Mai T. P. Le +1
This study investigates the integration of an intelligent reflecting surface (IRS) into an unmanned aerial vehicle (UAV) platform to utilize the advantages of these leading technol…
A Novel Heap-based Pilot Assignment for Full Duplex Cell-Free Massive MIMO with Zero-Forcing
Hieu V. Nguyen, Van-Dinh Nguyen, Octavia A. Dobre +4
This paper investigates the combined benefits of full-duplex (FD) and cell-free massive multiple-input multipleoutput (CF-mMIMO), where a large number of distributed access points…
Dynamic User Pairing for Non-Orthogonal Multiple Access in Downlink Networks
Kha-Hung Nguyen, Hieu V. Nguyen, Van-Phuc Bui +1
This paper considers a downlink (DL) system where non-orthogonal multiple access (NOMA) beamforming and dynamic user pairing are jointly optimized to maximize the minimum throughpu…
UAV-Assisted Secure Communications in Terrestrial Cognitive Radio Networks: Joint Power Control and 3D Trajectory Optimization
Phu X. Nguyen, Van-Dinh Nguyen, Hieu V. Nguyen +1
This paper considers secure communications for an underlay cognitive radio network (CRN) in the presence of an external eavesdropper (Eve). The secrecy performance of CRNs is usual…
Optimization of Rate Fairness in Multi-Pair Wireless-Powered Relaying Systems
Van-Phuc Bui, Van-Dinh Nguyen, Hieu V. Nguyen +2
This letter considers a multi-pair decode-and-forward relay network where a power-splitting (PS) protocol is adopted at the energy-constrained relay to provide simultaneous wireles…
On the Spectral and Energy Efficiencies of Full-Duplex Cell-Free Massive MIMO
Hieu V. Nguyen, Van-Dinh Nguyen, Octavia A. Dobre +4
In-band full-duplex (FD) operation is practically more suited for short-range communications such as WiFi and small-cell networks, due to its current practical limitations on the s…
Joint Power Control and User Association for NOMA-Based Full-Duplex Systems
Hieu V. Nguyen, Van-Dinh Nguyen, Octavia A. Dobre +3
This paper investigates the coexistence of non-orthogonal multiple access (NOMA) and full-duplex (FD) to improve both spectral efficiency (SE) and user fairness. In such a scenario…
Joint Antenna Array Mode Selection and User Assignment for Full-Duplex MU-MISO Systems
Hieu V. Nguyen, Van-Dinh Nguyen, Octavia A. Dobre +2
This paper considers a full-duplex (FD) multiuser multiple-input single-output system where a base station simultaneously serves both uplink (UL) and downlink (DL) users on the sam…
Optimal User Pairing for Achieving Rate Fairness in Downlink NOMA Networks
Van-Phuc Bui, Phu X. Nguyen, Hieu V. Nguyen +2
In this paper, a downlink non-orthogonal multiple access (NOMA) network is studied. We investigate the problem of jointly optimizing user pairing and beamforming design to maximize…
A New Design Paradigm for Secure Full-Duplex Multiuser Systems
Van-Dinh Nguyen, Hieu V. Nguyen, Octavia A. Dobre +1
We consider a full-duplex (FD) multiuser system where an FD base station (BS) is designed to simultaneously serve both downlink (DL) and uplink (UL) users in the presence of half-d…
An Efficient Spectral Leakage Filtering for IEEE 802.11af in TV White Space
Phu Xuan Nguyen, Thinh Hung Pham, Trang Hoang +1
Orthogonal frequency division multiplexing (OFDM) has been widely adopted for modern wireless standards and become a key enabling technology for cognitive radios. However, one of i…
Cooperative Prediction-and-Sensing Based Spectrum Sharing in Cognitive Radio Networks
Van-Dinh Nguyen, Oh-Soon Shin
This paper proposes prediction-and-sensing based spectrum sharing, a new spectrum-sharing model for cognitive radio networks, with a time structure for each resource block divided…
Enhancing PHY Security of Cooperative Cognitive Radio Multicast Communications
Van-Dinh Nguyen, Trung Q. Duong, Oh-Soon Shin +2
In this paper, we propose a cooperative approach to improve the security of both primary and secondary systems in cognitive radio multicast communications. During their access to t…
On the Design of Secure Full-Duplex Multiuser Systems under User Grouping Method
Van-Dinh Nguyen, Hieu V. Nguyen, Octavia A. Dobre +1
Consider a full-duplex (FD) multiuser system where an FD base station (BS) is designed to simultaneously serve both downlink users and uplink users in the presence of half-duplex e…
Precoder Design for Signal Superposition in MIMO-NOMA Multicell Networks
Van-Dinh Nguyen, Hoang Duong Tuan, Trung Q. Duong +2
The throughput of users with poor channel conditions, such as those at a cell edge, is a bottleneck in wireless systems. A major part of the power budget must be allocated to serve…
Joint Fractional Time Allocation and Beamforming for Downlink Multiuser MISO Systems
Van-Dinh Nguyen, Hoang Duong Tuan, Trung Q. Duong +2
It is well-known that the traditional transmit beamforming at a base station (BS) to manage interference in serving multiple users is effective only when the number of users is les…
Robust Beamforming for Secrecy Rate in Cooperative Cognitive Radio Multicast Communications
Van-Dinh Nguyen, Trung Q. Duong, Oh-Soon Shin +2
In this paper, we propose a cooperative approach to improve the security of both primary and secondary systems in cognitive radio multicast communications. During their access to t…
Joint Beamforming and Antenna Selection for Sum Rate Maximization in Cognitive Radio Networks
Van-Dinh Nguyen, Chuyen T. Nguyen, Hieu V. Nguyen +1
This letter studies joint transmit beamforming and antenna selection at a secondary base station (BS) with multiple primary users (PUs) in an underlay cognitive radio multiple-inpu…
Spectral Efficiency of Full-Duplex Multiuser System: Beamforming Design, User Grouping, and Time Allocation
Van-Dinh Nguyen, Hieu V. Nguyen, Chuyen T. Nguyen +1
Full-duplex (FD) systems have emerged as an es- sential enabling technology to further increase the data rate of wireless communication systems. The key idea of FD is to serve mult…
An Efficient Precoder Design for Multiuser MIMO Cognitive Radio Networks with Interference Constraints
Van-Dinh Nguyen, Le-Nam Tran, Trung Q. Duong +2
We consider a linear precoder design for an underlay cognitive radio multiple-input multiple-output broadcast channel, where the secondary system consisting of a secondary base-sta…
Performance Analysis of ZF Receivers with Imperfect CSI for Uplink Massive MIMO Systems
Van-Dinh Nguyen, Oh-Soon Shin
We consider the uplink of massive multipleinput multiple-output systems in a multicell environment. Since the base station (BS) estimates the channel state information (CSI) using…
Full-Duplex Relay based on Zero-Forcing Beamforming
Jong-Ho Lee, Oh-Soon Shin
In this paper, we propose a full-duplex relay (FDR) based on a zero-forcing beamforming (ZFBF) for a multiuser MIMO relay system. The ZFBF is employed at the base station to suppre…