scholarly journals Outage Performance Analysis of Non-Orthogonal Multiple Access with Time-Switching Energy Harvesting

2019 ◽  
Vol 25 (3) ◽  
pp. 85-91
Author(s):  
Hoang Thien Van ◽  
Hoang-Sy Nguyen ◽  
Thanh-Sang Nguyen ◽  
Van Van Huynh ◽  
Thanh-Long Nguyen ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Communication Networks ◽  
Multiple Access ◽  
Transmission Rate ◽  
Wireless Communication Networks ◽  
Decode And Forward ◽  
Time Switching ◽  
Outage Performance ◽  
Half Duplex ◽  
The Given

In recent years, although non-orthogonal multiple access (NOMA) has shown its potentials thanks to its ability to enhance the performance of future wireless communication networks, a number of issues emerge related to the improvement of NOMA systems. In this work, we consider a half-duplex (HD) relaying cooperative NOMA network using decode-and-forward (DF) transmission mode with energy harvesting (EH) capacity, where we assume the NOMA destination (D) is able to receive two data symbols in two continuous time slots which leads to the higher transmission rate than traditional relaying networks. To analyse EH, we deploy time-switching (TS) architecture to comprehensively study the optimal transmission time and outage performance at D. In particular, we are going to obtain closed-form expressions for outage probability (OP) with optimal TS ratio for both data symbols with both exact and approximate forms. The given simulation results show that the placement of the relay (R) plays an important role in the system performance.

scholarly journals Power Beacon-Assisted Energy Harvesting in a Half-Duplex Communication Network under Co-Channel Interference over a Rayleigh Fading Environment: Energy Efficiency and Outage Probability Analysis

Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2579 ◽  
Author(s):  
Van-Duc Phan ◽  
Tan N. Nguyen ◽  
Minh Tran ◽  
Tran Thanh Trang ◽  
Miroslav Voznak ◽  
...  
Keyword(s):  
Communication Network ◽  
Energy Efficiency ◽  
Energy Harvesting ◽  
Outage Probability ◽  
Communication Networks ◽  
Rayleigh Fading ◽  
Primary System ◽  
Wireless Communication Networks ◽  
Half Duplex ◽  
Analytical Expressions

In this time, energy efficiency (EE), measured in bits per Watt, has been considered as an important emerging metric in energy-constrained wireless communication networks because of their energy shortage. In this paper, we investigate power beacon assisted (PB) energy harvesting (EH) in half-duplex (HD) communication network under co-channel Interferer over Rayleigh fading environment. In this work, we investigate the model system with the time switching (TS) protocol. Firstly, the exact and asymptotic form expressions of the outage probability (OP) are analyzed and derived. Then the system EE is investigated and the influence of the primary system parameters on the system performance. Finally, we verify the correctness of the analytical expressions using Monte Carlo simulation. Finally, we can state that the simulation and analytical results are the same.

scholarly journals SWIPT-Based Nonorthogonal Multiple Access under Arbitrary Nakagami-m Fading with Direct Links

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Thanh-Luan Nguyen ◽  
Duy-Hung Ha ◽  
Phu Tran Tin ◽  
Nguyen Van Vinh
Keyword(s):  
Energy Harvesting ◽  
Outage Probability ◽  
Multiple Access ◽  
Cooperative Relay ◽  
Power Splitting ◽  
Decode And Forward ◽  
Transmit Power ◽  
Time Switching ◽  
Similar Performance ◽  
Comparative Results

This paper studies the joint impact of simultaneous wireless information and power transfer (SWIPT) and nonorthogonal multiple access (NOMA) to the cooperative relay (CoR) network where direct links exist. Over Nakagami-m fading environments, the near users employ decode-and-forward (DF) and energy harvesting (EH) to assist the transmission from the source to the far users. Exploiting the time-switching protocol (TSP) and power-splitting protocol (PSP) to the CoR-based NOMA system, analytical results for the outage probability are derived, and the corresponding throughput is obtained. Comparative results show that the PSP outperforms the TSP at low transmit power, while at high-transmit-power regime, the TSP provides similar performance as the PSP.

scholarly journals Outage performance analysis of non-orthogonal multiple access systems with RF energy harvesting

2021 ◽  
Vol 11 (5) ◽  
pp. 4135
Author(s):  
Hoang Thien Van ◽  
Vo Tien Anh ◽  
Danh Hong Le ◽  
Ma Quoc Phu ◽  
Hoang-Sy Nguyen
Keyword(s):  
Energy Harvesting ◽  
Fading Channels ◽  
Multiple Access ◽  
Power Splitting ◽  
Decode And Forward ◽  
Fifth Generation ◽  
Half Duplex ◽  
Iot Devices ◽  
Indoor Scenarios ◽  
Log Normal

Non-orthogonal multiple access (NOMA) has drawn enormous attention from the research community as a promising technology for future wireless communications with increasing demands of capacity and throughput. Especially, in the light of fifth-generation (5G) communication where multiple internet-of-things (IoT) devices are connected, the application of NOMA to indoor wireless networks has become more interesting to study. In view of this, we investigate the NOMA technique in energy harvesting (EH) half-duplex (HD) decode-and-forward (DF) power-splitting relaying (PSR) networks over indoor scenarios which are characterized by log-normal fading channels. The system performance of such networks is evaluated in terms of outage probability (OP) and total throughput for delay-limited transmission mode whose expressions are derived herein. In general, we can see in details how different system parameters affect such networks thanks to the results from Monte Carlo simulations. For illustrating the accuracy of our analytical results, we plot them along with the theoretical ones for comparison.

scholarly journals Performance Optimization of Hybrid Satellite-Terrestrial Relay Network Based on CR-NOMA

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5177
Author(s):  
Long Zhao ◽  
Tao Liang ◽  
Kang An
Keyword(s):  
Performance Optimization ◽  
Transmission Rate ◽  
Relay Network ◽  
High Signal ◽  
Decode And Forward ◽  
Obvious Effect ◽  
Selection Scheme ◽  
Outage Performance ◽  
Multiple User ◽  
Power Domain

The non-orthogonal multiple access (NOMA) scheme realizes the transmission of multiple user signals at the same time and frequency resource block through power domain multiplexing, which improves the system transmission rate and user fairness. In this paper, we propose a joint relay-and-antenna selection scheme based on the cognitive radio scenario. This scheme can achieve the maximum communication rate of the secondary user when the primary user maintains the optimal outage performance. In the considered system both terrestrial relays and users are deployed with multi-antenna configurations and the terrestrial relays adopt the decode-and-forward (DF) strategy to achieve communication between satellites and users. Then, we derive the exact outage probability expression of each user in the system and the asymptotic probability expression under high signal-to-noise ratio (SNR). Numeric results demonstrate that increasing the number of relays and antennas on the terrestrial nodes can both improve system outage performance. Moreover, the number of relays imposes a more obvious effect on the achievable system performance.

scholarly journals No-Regret Matching Game Algorithm for NOMA Based UAV-Assisted NB-IoT Systems

2021 ◽  
Vol 26 (1) ◽  
pp. 79-85
Author(s):  
Samar Shaker Metwaly ◽  
Ahmed. M. Abd El-Haleem ◽  
Osama El-Ghandour
Keyword(s):  
Communication Networks ◽  
Multiple Access ◽  
Learning Algorithm ◽  
Base Station ◽  
Throughput Capacity ◽  
System Capacity ◽  
Wireless Communication Networks ◽  
Total Rate ◽  
Small Base ◽  
Matching Game

NB-IoT is the standardized technology for machine type communication (MTC) in Long Term Evolution (LTE). NB-IoT can achieve IoT requirements nevertheless, it suffers a low rate and capacity. On the other hand, Unmanned aerial vehicles (UAV) and Non-Orthogonal Multiple Access (NOMA) are promising technology used to enhance the throughput, capacity, and coverage of wireless communication networks. In this paper, we propose a heterogeneous network scenario where a UAV small Base Station (UBS) is used to assist the LTE Macro Base Station (MBS) with the help of the Non-Orthogonal Multiple Access technique to solve the NB-IoT throughput and capacity issues. Matching game based no-regret learning algorithm is proposed to optimize the NB-IoT device association and using NOMA pairing at each base station to provide the maximum system total rate and capacity. Simulation results show that our proposed scheme increases the total rate of the system by 60% and the system capacity by at least 80%, compared to NOMA without UAV and the total rate and capacity of the system by 200% and 85% respectively, with OMA scheme.

scholarly journals Intelligent reflected surfaces assisted code domain non-orthogonal multiple access scheme

2021 ◽  
Vol 72 (5) ◽  
pp. 343-347
Author(s):  
Aasheesh Shukla
Keyword(s):  
Communication Networks ◽  
Information Transfer ◽  
Multiple Access ◽  
Wireless Communication Networks ◽  
Radio Waves ◽  
Reflection And Refraction ◽  
Access Scheme ◽  
Code Domain ◽  
Efficient Code ◽  
Phase Amplitude

Abstract The propagation medium plays a crucial role in any wireless communication networks, the channel between the transmitter and the receiver, deteriorate the quality of the received signal due to the uncontrollable interactions such as scattering, reflection, and refraction in the channel with the surrounding objects. To overcome this challenge, the recent advent of recongurable intelligent surfaces can be helpful, in which the network operators can control the radio waves, eg, the phase, amplitude, frequency, and even polarization, of the impinging signals without the need of complex decoding, encoding, and radio frequency processing operations. On the other hand, few research papers reported an efficient code domain non orthogonal multiple access (NOMA) such as Interleave division multiple access (IDMA) system for wireless information transfer. Persuaded by the capability of this arising RIS technology, the present article is aimed to provide the modified framework of IDMA (code-domain NOMA) communication system based on RIS technology. Simulation results demonstrate that the proposed system achieves better SNR performance than the conventional IDMA framework.

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