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1
Exact Outage Probability of Two-Way Decode-and-Forward NOMA Scheme with Opportunistic Relay Selection

( Tan-phuoc Huynh ),( Pham Ngoc Son ),( Miroslav Voznak ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.12
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  KISS
In this paper, we propose a two-way relaying scheme using non-orthogonal multiple access (NOMA) technology. In this scheme, two sources transmit packets with each other under the assistance of the decode-and-forward (DF) relays, called as a TWDFNOMA protocol. The cooperative relays exploit successive interference cancellation (SIC) technique to decode sequentially the data packets from received summation signals, and then use the digital network coding (DNC) technique to encrypt received data from two sources. A max-min criterion of end-to-end signal-to-interference-plus-noise ratios (SINRs) is used to select a best relay in the proposed TWDFNOMA protocol. Outage probabilities are analyzed to achieve exact closed-form expressions and then, the system performance of the proposed TWDFNOMA protocol is evaluated by these probabilities. Simulation and analysis results discover that the system performance of the proposed TWDFNOMA protocol is improved when compared with a conventional three-timeslot two-way relaying scheme using DNC (denoted as a TWDNC protocol), a four-timeslot two-way relaying scheme without using DNC (denoted as a TWNDNC protocol) and a two-timeslot two-way relaying scheme with amplify-and-forward operations (denoted as a TWANC protocol). Particularly, the proposed TWDFNOMA protocol achieves best performances at two optimal locations of the best relay whereas the midpoint one is the optimal location of the TWDNC and TWNDNC protocols. Finally, the probability analyses are justified by executing Monte Carlo simulations.
2
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
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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.
3
Short packet communication in underlay cognitive network assisted by an intelligent reflecting surface

Pham Ngoc Son,Tran Trung Duy,Pham Viet Tuan,Tan-Phuoc Huynh Electronics and Telecommunications Research Instit 2023 ETRI Journal Vol.45 No.1
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We propose short packet communication in an underlay cognitive radio network assisted by an intelligent reflecting surface (IRS) composed of multiple reconfigurable reflectors. This scheme, called the IRS protocol, operates in only one time slot (TS) using the IRS. The IRS adjusts its phases to give zero received cumulative phase at the secondary destination, thereby enhancing the end-to-end signal-to-noise ratio. The transmitting power of the secondary source is optimized to simultaneously satisfy the multi-interference constraints, hardware limitations, and performance improvement. Simulation and analysis results of the average block error rates (BLERs) show that the performance can be enhanced by installing more reconfigurable reflectors, increasing the blocklength, lowering the number of required primary receivers, or sending fewer information bits. Moreover, the proposed IRS protocol always outperforms underlay relaying protocols using two TSs for data transmission, and achieves the best average BLER at identical transmission distances between the secondary source and secondary destination. The theoretical analyses are confirmed by Monte Carlo simulations.