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Energy Harvesting Protocol for Optimal Throughput in WLAN
Tan-Phuoc Huynh,Dinh-Thuan Do,Hoang-Sy Nguyen,Thanh-Dai Nguyen 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
In this paper, the time power switching based relaying (TPSR) protocol is proposed for energy harvesting (EH) enabled mobile node in WLAN. Specifically, we investigate how the time and power factors in EH protocol at relay mobile node affects on outage probability and throughput performance. Specifically, we develop outage and throughput performance characterizations in term of time and power factors in the proposed scheme. The tightness of our proposed protocol is determined through simulation results. We confirm that the optimal throughput is critically dependent on time switching and power splitting factor of the TPSR protocol.
Time Switching for Wireless Communications with Full-Duplex Relaying in Imperfect CSI Condition
( Tan N. Nguyen ),( Dinh-thuan Do ),( Phuong T. Tran ),( Miroslav Voznak ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.9
In this paper, we consider an amplify-and-forward (AF) full-duplex relay network (FDRN) using simultaneous wireless information and power transfer, where a battery-free relay node harvests energy from the received radio frequency (RF) signals from a source node and uses the harvested energy to forward the source information to destination node. The time-switching relaying (TSR) protocol is studied, with the assumption that the channel state information (CSI) at the relay node is imperfect. We deliver a rigorous analysis of the outage probability of the proposed system. Based on the outage probability expressions, the optimal time switching factor are obtained via the numerical search method. The simulation and numerical results provide practical insights into the effect of various system parameters, such as the time switching factor, the noise power, the energy harvesting efficiency, and the channel estimation error on the performance of this network. It is also observed that for the imperfect CSI case, the proposed scheme still can provide acceptable outage performance given that the channel estimation error is bounded in a permissible interval.
( Thanh-luan Nguyen ),( Dinh-thuan Do ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.5
Considering a dual-hop energy-harvesting (EH) relaying system, this paper advocates novel relaying protocols based on adaptive time power switching-based relaying (AR) architecture for amplify-and-forward (AF) mode. We introduce novel system model relaying network with impacts of co-channel interference (CCI) and derive analytical expressions for the average harvested energy, outage probability, and the optimal throughput of the information transmission link, taking into account the effect of CCI from neighbor cellular users. In particular, we consider such neighbor users procedure CCI both on the relay and destination nodes. Theoretical results show that, in comparison with the conventional solutions, the proposed model can achieve optimal throughput efficiency for sufficiently small threshold SNR with condition of reasonable controlling time switching fractions and power splitting fractions in concerned AR protocol. We also explore impacts of transmission distances in each hop, transmission rate, the other key parameters of AR to throughput performance for different channel models. Simulation results are presented to corroborate the proposed methodology.
( Nguyen Xuan Xinh ),( Dinh-thuan Do ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.4
This paper investigates a protocol so-called Adaptive Harvest Then Transmit (AHTT) for wireless powered communication networks (WPCNs) in multiple-input single-output (MISO) downlink systems, which assists in transmitting signals from a multi-antenna transmitter to a single-antenna receiver. Particularly, the power constrained relay is supplied with power by utilizing radio frequency (RF) signals from the source. In order to take advantage of multiple antennas, two different linear processing schemes, including Maximum Ratio Combining (MRC) and Selection Combination (SC) are studied. The system outage capacity and ergodic capacity are evaluated for performance analysis. Furthermore, the optimal power allocation is also considered. Our numerical and simulation results prove that the implementation of multiple antennas helps boost the energy harvesting capability. Therefore, this paper puts forward a new way to the energy efficiency (EE) enhancement, which contributes to better system performance.
New look at secure performance of massive MIMO with low-resolution DACs
Anh-Tu Le,Dinh-Thuan Do,Nhu-Ngoc Dao,Nhan Duc Nguyen,Adão Silva 한국통신학회 2023 ICT Express Vol.9 No.4
Since the requirement of secure transmission for massive multiple-input–multiple-output (mIMO) is high, we consider a secure massive MIMO system in presence of multiple digital to analog converters (DACs). We deal with complicated performance analysis of the proposed system including a base station, a legitimate user, and an eavesdropper while these nodes are equipped with multiple antennas. In particular, we intend to present the closed-form expression for the ergodic secrecy rate of the system and also calculate the optimal power allocation for better performance gain. The simulation analysis shows that quantization bits, transmit signal to noise ratio at the base station, and power allocation plays a major role in enhancing the performance of the system.
Tam Nguyen Kieu,Tran Hoang Quang Minh,Thuan Do Dinh,Miroslav Vozňák 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.3
Energy harvesting (EH) based on surrounding radio frequency (RF) has lastly become advanced approach to prolong the lifetime of the wireless networks. This paper deals with energy harvesting architecture of the half duplex and the full duplex relaying networks. By applying time switching based relaying (TSR) protocol and Amplify-and-Forward (AF) scheme, we derive the closed-form expression of the instantaneous throughput and then compare instantaneous throughput of two networks. An important result can be seen clearly that the time fraction, the position of relay, noise at relay, energy conversion factor as well as target rate in TSR impact on their throughput. Finally, numerical results show an efficient relaying strategy in half-duplex and full duplex cooperative networks.