scholarly journals Outage Probability of Cognitive DF Relay Systems over Nakagami-m Fading

2019 ◽  
Vol 2019 ◽  
pp. 1-5
Author(s):  
Dong Qin
Keyword(s):  
Outage Probability ◽  
Data Transmission ◽  
Spectrum Sharing ◽  
Peak Power ◽  
Primary System ◽  
Secondary System ◽  
Decode And Forward ◽  
Relay System ◽  
Relay Systems ◽  
The Impact

This paper aims to derive accurate outage probability expressions of a cognitive decode-and-forward (DF) relay system over the Nakagami-m fading channel. A secondary system and a primary system coexist in a spectrum sharing the environment. In order to protect the data transmission of the primary system, the transmission power of the secondary system cannot exceed the tolerable interference threshold of the primary system and its available peak power. In particular, we also consider the impact on the secondary system when the primary system turns on its transmitter. Simulation results align with our theoretical formulas very well.

scholarly journals Outage Analysis in SWIPT Enabled Spectrum Sharing D2D Communication for IoT Applications

2021 ◽  
Author(s):  
Sutanu Ghosh ◽  
Tamaghna Acharya ◽  
Santi P. Maity
Keyword(s):  
Network Architecture ◽  
Spectrum Sharing ◽  
Spectrum Efficiency ◽  
Design Parameters ◽  
Secondary System ◽  
D2d Communications ◽  
Amplify And Forward ◽  
Decode And Forward ◽  
The Impact ◽  
Af Relaying

<div>This paper reports a relative performance analysis of decode-and-forward (DF) and amplify-and-forward (AF) relaying in a multi-antenna cooperative cognitive radio network (CCRN) that supports device-to-device (D2D) communications using spectrum sharing technique in cellular network. In this work, cellular system is considered as primary and internet of things devices (IoDs), engaged in D2D communications, are considered as secondary system. The devices access the licensed spectrum by means of the cooperation in two-way primary communications. Furthermore, IoDs are energized through the harvesting of energy from radio frequency (RF) signals, using simultaneous wireless information and power transfer (SWIPT) protocol. Closed form expressions of the outage probability for both cellular and D2D communications are derived and the impact of various design parameters for both AF and DF relaying techniques are studied. Based on the simulation results, it is found that the proposed spectrum sharing protocol, for both DF relaying and AF relaying schemes, outperform a similar network architecture in terms of spectrum efficiency. It is also observed that the performance of the proposed system using DF relaying is ~168% better compared to AF relaying scheme in term of peak energy efficiency at same transmit power.</div>

scholarly journals Outage Analysis in SWIPT Enabled Cooperative AF/DF Relay Assisted Two-Way Spectrum Sharing Communication

2021 ◽  
Author(s):  
Sutanu Ghosh ◽  
Tamaghna Acharya ◽  
Santi P. Maity
Keyword(s):  
Network Architecture ◽  
Spectrum Sharing ◽  
Spectrum Efficiency ◽  
Design Parameters ◽  
Secondary System ◽  
D2d Communications ◽  
Amplify And Forward ◽  
Decode And Forward ◽  
The Impact ◽  
Af Relaying

<pre>This paper reports relative performance of decode-and-forward (DF) and amplify-and-forward (AF) relaying in a multi-antenna cooperative cognitive radio network (CCRN) that supports device-to-device (D2D) communications using spectrum sharing technique in cellular network. In this work, cellular system is considered as primary and internet of things devices (IoDs), engaged in D2D communications, are considered to be secondary system. The devices access the licensed spectrum by means of the cooperation in two-way primary communications. Furthermore, IoDs are energized by harvesting the energy from radio frequency (RF) signals, using simultaneous wireless information and power transfer (SWIPT) protocol. Closed form expressions of outage probability for both cellular and D2D communications are derived and the impact of various design parameters for both AF and DF relaying techniques are studied. Based on the simulation results, it is found that the proposed spectrum sharing protocol, for both DF relaying and AF relaying schemes, outperform another similar network architecture in terms of spectrum efficiency. It is also observed that the performance of the proposed system using DF relaying is better than AF relaying scheme in terms of energy efficiency at same transmit power<br></pre>

scholarly journals Outage Analysis in SWIPT Enabled Spectrum Sharing D2D Communication for IoT Applications

2021 ◽  
Author(s):  
Sutanu Ghosh ◽  
Tamaghna Acharya ◽  
Santi P. Maity
Keyword(s):  
Network Architecture ◽  
Spectrum Sharing ◽  
Spectrum Efficiency ◽  
Design Parameters ◽  
Secondary System ◽  
D2d Communications ◽  
Amplify And Forward ◽  
Decode And Forward ◽  
The Impact ◽  
Af Relaying

<div>This paper reports a relative performance analysis of decode-and-forward (DF) and amplify-and-forward (AF) relaying in a multi-antenna cooperative cognitive radio network (CCRN) that supports device-to-device (D2D) communications using spectrum sharing technique in cellular network. In this work, cellular system is considered as primary and internet of things devices (IoDs), engaged in D2D communications, are considered as secondary system. The devices access the licensed spectrum by means of the cooperation in two-way primary communications. Furthermore, IoDs are energized through the harvesting of energy from radio frequency (RF) signals, using simultaneous wireless information and power transfer (SWIPT) protocol. Closed form expressions of the outage probability for both cellular and D2D communications are derived and the impact of various design parameters for both AF and DF relaying techniques are studied. Based on the simulation results, it is found that the proposed spectrum sharing protocol, for both DF relaying and AF relaying schemes, outperform a similar network architecture in terms of spectrum efficiency. It is also observed that the performance of the proposed system using DF relaying is ~168% better compared to AF relaying scheme in term of peak energy efficiency at same transmit power.</div>

Secondary Use of Radio Spectrum by High Altitude Platform

2013 ◽  
pp. 290-300
Author(s):  
Zhe Yang ◽  
Abbas Mohammed
Keyword(s):  
High Altitude ◽  
Spectrum Sharing ◽  
Radio Spectrum ◽  
Primary System ◽  
Secondary System ◽  
Secondary Use ◽  
Terrestrial System ◽  
High Altitude Platform ◽  
Radio Resources ◽  
Systems Simulation

Traditional spectrum licensing enables guaranteed quality of service but could lead to inefficient use of the spectrum. The quest to achieve higher usage efficiency for the spectrum has been the hottest research topic worldwide recently. More efficient transmission technologies are being developed, but they alone cannot solve problems of spatially and temporally underused spectrum and radio resources. In this chapter, the authors review major challenges in traditional spectrum sharing and mechanisms to optimize the efficiency of spectrum usage. They investigate and assess incentives of a primary terrestrial system and secondary system based on a High-Altitude Platform (HAP) to share spectrum towards common benefits. The primary terrestrial system is defined to have exclusive rights to access the spectrum, which is shared by the secondary HAP system upon request. The Markov chain is presented to model two spectrum-sharing scenarios and evaluate the performance of spectrum sharing between primary terrestrial and secondary HAP systems. Simulation results show that to reserve an amount of spectrum from a primary system could encourage spectrum sharing with a secondary system, which has a frequent demand on requesting spectrum resources.

scholarly journals A Study of Physical Layer Security in SWIPT-Based Decode-and-Forward Relay Networks with Dynamic Power Splitting

Sensors ◽  
2021 ◽  
Vol 21 (17) ◽  
pp. 5692
Author(s):  
Van-Duc Phan ◽  
Tan N. Nguyen ◽  
Anh Vu Le ◽  
Miroslav Voznak
Keyword(s):  
Outage Probability ◽  
Physical Layer Security ◽  
Physical Layer ◽  
Secrecy Outage Probability ◽  
Power Splitting ◽  
Decode And Forward ◽  
Dynamic Power ◽  
Secrecy Outage ◽  
Multiple Relay ◽  
The Impact

In this paper, we study the physical layer security for simultaneous wireless information and power transfer (SWIPT)-based half-duplex (HD) decode-and-forward relaying system. We consider a system model including one transmitter that tries to transmit information to one receiver under the help of multiple relay users and in the presence of one eavesdropper that attempts to overhear the confidential information. More specifically, to investigate the secrecy performance, we derive closed-form expressions of outage probability (OP) and secrecy outage probability for dynamic power splitting-based relaying (DPSBR) and static power splitting-based relaying (SPSBR) schemes. Moreover, the lower bound of secrecy outage probability is obtained when the source’s transmit power goes to infinity. The Monte Carlo simulations are given to corroborate the correctness of our mathematical analysis. It is observed from simulation results that the proposed DPSBR scheme outperforms the SPSBR-based schemes in terms of OP and SOP under the impact of different parameters on system performance.

scholarly journals Outage Probability of Dual-Hop Multiple Antenna Relay Systems with Interference at the Relay and Destination

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Mengmeng Liu ◽  
Jianhua Zhang ◽  
Ping Zhang
Keyword(s):  
Outage Probability ◽  
Gaussian Noise ◽  
Additive White Gaussian Noise ◽  
Multiple Antenna ◽  
Amplify And Forward ◽  
Decode And Forward ◽  
Relay Systems ◽  
Single Antenna ◽  
Relaying Systems ◽  
Relaying System

This paper analyzes the outage performance of a dual-hop relaying system in which the relay is equipped with multiple antennas, while the source and destination have a single antenna. New exact closed-form expressions for the outage probability of both the amplify-and-forward (AF) and the decode-and-forward (DF) relaying systems are derived, assuming that the relay and destination are impaired by cochannel interferers and additive white Gaussian noise (AWGN). Numerical results are presented to verify the theoretical analysis.

scholarly journals Multiple Access-Enabled Relaying with Piece-Wise and Forward NOMA: Rate Optimization under Reliability Constraints

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4783
Author(s):  
Farnaz Khodakhah ◽  
Aamir Mahmood ◽  
Patrik Österberg ◽  
Mikael Gidlund
Keyword(s):  
Spectrum Sharing ◽  
Multiple Access ◽  
Cooperative Relaying ◽  
Achievable Rate ◽  
Second Phase ◽  
Relay Channel ◽  
Direct Link ◽  
Secondary System ◽  
Amplify And Forward ◽  
Decode And Forward

The increasing proliferation of Internet-of-things (IoT) networks in a given space requires exploring various communication solutions (e.g., cooperative relaying, non-orthogonal multiple access, spectrum sharing) jointly to increase the performance of coexisting IoT systems. However, the design complexity of such a system increases, especially under the constraints of performance targets. In this respect, this paper studies multiple-access enabled relaying by a lower-priority secondary system, which cooperatively relays the incoming information to the primary users and simultaneously transmits its own data. We consider that the direct link between the primary transmitter–receiver pair uses orthogonal multiple access in the first phase. In the second phase, a secondary transmitter adopts a relaying strategy to support the direct link while it uses non-orthogonal multiple access (NOMA) to serve the secondary receiver. As a relaying scheme, we propose a piece-wise and forward (PF) relay protocol, which, depending on the absolute value of the received primary signal, acts similar to decode-and-forward (DF) and amplify-and-forward (AF) schemes in high and low signal-to-noise ratio (SNR), respectively. By doing so, PF achieves the best of these two relaying protocols using the adaptive threshold according to the transmitter-relay channel condition. Under PF-NOMA, first, we find the achievable rate region for primary and secondary receivers, and then we formulate an optimization problem to derive the optimal PF-NOMA time and power fraction that maximize the secondary rate subject to reliability constraints on both the primary and the secondary links. Our simulation results and analysis show that the PF-NOMA outperforms DF-NOMA and AF-NOMA-based relaying techniques in terms of achievable rate regions and rate-guaranteed relay locations.

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.

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