scholarly journals Power Resource Optimization for Backscatter-Aided Symbiotic Full-Duplex Secondary Transmission with Hardware Impairments in a Cognitive Radio Framework

Sensors ◽  
2022 ◽  
Vol 22 (1) ◽  
pp. 375
Author(s):  
Derek Kwaku Pobi Asiedu ◽  
Ji-Hoon Yun
Keyword(s):  
Cognitive Radio ◽  
Interference Cancellation ◽  
Resource Optimization ◽  
Full Duplex ◽  
Power Resource ◽  
Hardware Impairments ◽  
Half Duplex ◽  
Link Rate ◽  
Sum Rate ◽  
Secondary Link

This paper investigates the power resource optimization problem for a new cognitive radio framework with a symbiotic backscatter-aided full-duplex secondary link under imperfect interference cancellation and other hardware impairments. The problem is formulated using two approaches, namely, maximization of the sum rate and maximization of the primary link rate, subject to rate constraints on the secondary link, and the solution for each approach is derived. The problem of a half-duplex secondary link is also solved. Simulation results show that the sum rate and exploitation of the full-duplex capability of the secondary link are strongly affected by both the problem objective and hardware impairments.

scholarly journals Performance Analysis of Full-Duplex Amplify-and-Forward Relay System with Hardware Impairments and Imperfect Self-Interference Cancellation

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Ba Cao Nguyen ◽  
Xuan Nam Tran
Keyword(s):  
Interference Cancellation ◽  
Signal To Noise Ratio ◽  
Relay Node ◽  
Analytical Framework ◽  
Full Duplex ◽  
High Signal ◽  
Amplify And Forward ◽  
Relay System ◽  
Hardware Impairments ◽  
The Impact

In this paper, we analyze the performance of a full-duplex (FD) amplify-and-forward (AF) relay system with imperfect hardware. Besides the aggregate hardware impairments of the imperfect transceiver, we also consider the impact of residual self-interference (RSI) due to imperfect cancellation at the FD relay node. An analytical framework for analyzing the system performance including exact outage probability (OP), asymptotic OP, and approximate symbol error probability (SEP) is developed. In order to tackle these impacts, we propose an optimal power allocation scheme which can improve the outage performance of the FD relay node, especially at the high signal-to-noise ratio (SNR) regime. Numerical results are presented for various evaluation scenarios and verified using the Monte Carlo simulations.

scholarly journals Full-Duplex or Half-Duplex: A Bayesian Game for Wireless Networks with Heterogeneous Self-Interference Cancellation Capabilities

2018 ◽  
Vol 17 (5) ◽  
pp. 1076-1089 ◽  
Author(s):  
Wessam Afifi ◽  
Mohammad J. Abdel-Rahman ◽  
Marwan Krunz ◽  
Allen B. MacKenzie
Keyword(s):  
Wireless Networks ◽  
Interference Cancellation ◽  
Full Duplex ◽  
Bayesian Game ◽  
Half Duplex

Inter-Client Interference Cancellation for Full-Duplex Networks With Half-Duplex Clients

2019 ◽  
Vol 27 (5) ◽  
pp. 2150-2163
Author(s):  
Kate Ching-Ju Lin ◽  
Kai-Cheng Hsu ◽  
Hung-Yu Wei
Keyword(s):  
Interference Cancellation ◽  
Full Duplex ◽  
Half Duplex

scholarly journals Exploiting Impact of Hardware Impairments in NOMA: Adaptive Transmission Mode in FD/HD and Application in Internet-of-Things

Sensors ◽  
2019 ◽  
Vol 19 (6) ◽  
pp. 1293 ◽  
Author(s):  
Chi-Bao Le ◽  
Dinh-Thuan Do ◽  
Miroslav Voznak
Keyword(s):  
Internet Of Things ◽  
Multiple Access ◽  
Low Cost ◽  
Relay Node ◽  
Ergodic Capacity ◽  
Adaptive Transmission ◽  
Full Duplex ◽  
Transmission Strategy ◽  
Hardware Impairments ◽  
Half Duplex

In this paper, a cooperative non-orthogonal multiple access (NOMA) system is studied for the Internet-of-Things (IoT) in which a master node intends to serve multiple client nodes. The adaptive transmission strategy is proposed at the relay node, i.e., the relay can be half-duplex (HD) and/or full duplex (FD). In practical terms, numerous low-cost devices are deployed in such IoT systems and it exhibits degraded performance due to hardware imperfections. In particular, the effects of hardware impairments in the NOMA users are investigated. Specifically, the closed-form expressions are derived for the outage probability. Moreover, the ergodic capacity is also analysed. This study also comparatively analyzes the orthogonal multiple access (OMA) and NOMA with HD and/or FD relaying. The numerical results are corroborated through Monte Carlo simulations.

scholarly journals In-Band Full-Duplex Relaying for SWIPT-Enabled Cognitive Radio Networks

Electronics ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 835
Author(s):  
Hieu V. Nguyen ◽  
Van-Dinh Nguyen ◽  
Oh-Soon Shin
Keyword(s):  
Cognitive Radio ◽  
Data Transmission ◽  
Optimal Solution ◽  
Low Complexity ◽  
Full Duplex ◽  
Primary System ◽  
Rate Maximization ◽  
Radio Systems ◽  
Sum Rate ◽  
Multiple Transmit

This paper studies sum rate maximization of a cognitive radio network, where a full-duplex relay (FDR) is considered to assist data transmission. An FDR equipped with multiple transmit/receive antennas is introduced to harvest energy from the radio frequency signal of the primary system to reuse the energy for its own data transmission. By exploiting the time-switching relaying protocol, we first formulate an optimization problem for the sum rate of primary and secondary receivers and then propose a low-complexity algorithm to find the optimal solution. Numerical results verify the effectiveness of the proposed technique for wireless information and power transfer in cognitive radio systems.

scholarly journals On Performance of Full-Duplex Decode-and-Forward Relay Systems with an Optimal Power Setting under the Impact of Hardware Impairments

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Ba Cao Nguyen ◽  
Xuan Nam Tran ◽  
Thi Thu Hang Nguyen ◽  
Dinh Tan Tran ◽  
Donatella Darsena
Keyword(s):  
Interference Cancellation ◽  
Exact Expression ◽  
Full Duplex ◽  
Power Calculation ◽  
Direct Link ◽  
Decode And Forward ◽  
Hardware Impairments ◽  
Relay Systems ◽  
Optimal Power ◽  
The Impact

In this paper, we analyze the performance of in-band full-duplex (IBFD) relay systems that use the decode-and-forward (DF) protocol at the relay under the impact of imperfect self-interference cancellation and hardware impairments. Three practical relay scenarios are considered in our analysis: (i) there is no direct link from the source to the destination; (ii) there is a direct link, but the signal from the source is considered interference; and (iii) there is a direct link, and the signal from the source is cooperatively combined with that from the relaying path. Specifically, we derive exact and asymptotic expressions for the outage probability (OP) of the IBFD system. Based on the OP, the exact expression for symbol error probability (SEP) is also derived. Moreover, in order to cope with the effect of imperfect self-interference cancellation (SIC) due to the full-duplex mode, we propose optimal and suboptimal power calculation methods for the relay to minimize the OP and SEP. A performance evaluation shows that the IBFD relay system is significantly affected by both imperfect SIC and hardware impairments. However, the optimal power values can help to improve the system performance, significantly.

scholarly journals Joint Full-Duplex/Half-Duplex Transmission-Switching Scheduling and Transmission-Energy Allocation in Cognitive Radio Networks with Energy Harvesting

Sensors ◽  
2018 ◽  
Vol 18 (7) ◽  
pp. 2295 ◽  
Author(s):  
Tran Hoan ◽  
Hiep Vu-Van ◽  
Insoo Koo
Keyword(s):  
Cognitive Radio ◽  
Energy Harvesting ◽  
Cognitive Radio Networks ◽  
Radio Networks ◽  
Base Station ◽  
Full Duplex ◽  
Transmission Protocol ◽  
Half Duplex ◽  
Cognitive User

The full-duplex transmission protocol has been widely investigated in the literature in order to improve radio spectrum usage efficiency. Unfortunately, due to the effect of imperfect self-interference suppression, the change in transmission power and path loss of non-line-of-sight fading channels will strongly affect performance of full-duplex transmission mode. This entails that the full-duplex transmission protocol is not always a better selection compared to the traditional half-duplex transmission protocol. Considering solar energy-harvesting-powered cognitive radio networks (CRNs), we investigate a joint full-duplex/half-duplex transmission switching scheduling and transmission power allocation in which we utilize the advantages of both half-duplex and full-duplex transmission modes for maximizing the long-term throughput of cognitive radio networks. First, we formulate the transmission rate of half-duplex and full-duplex links for fading channels between cognitive user and base station in which the channel gain is assumed to follow an exponential distribution. Afterward, by considering the availability probability of the primary channel, the limitation of the energy-harvesting capacity of the cognitive user, and the transmission capacity of half-duplex and full-duplex links, we describe the problem in terms of long-term expected throughput. The problem is then solved by adopting the partially observable Markov decision process framework to find the optimal transmission policy for the transmission pair between cognitive user and base station in order to maximize the long-term expected throughput. The optimal policy consists of either the half-duplex or the full-duplex transmission protocols as well as the corresponding amount of transmission energy in each time slot. In addition, to reduce the complexity in formulation and calculation, we also apply the actor–critic-based learning method to solve the considered problem. Finally, the performance of the proposed scheme was evaluated by comparing it with a conventional scheme in which the context of energy harvesting and long-term throughput is not considered.

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