Dual-Hop Variable-Gain AF Relaying with Beamforming over k-&amp;#x00B5; Shadowed Fading Channels

Hussain, Ayaz; Kim, Sang-Hyo; Chang, Shengjiang

doi:10.1109/glocom.2016.7841758

Cited by 9 publications

(17 citation statements)

References 14 publications

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“…Energy harvesting (EH) is a technology to gather energy from the surrounding radio frequency (RF) waves and got outstanding recognition to sustain a network lifetime [1]- [14]. The RF signals have an ability to convey energy and information concurrently, therefore, it is possible to collect or harvest the energy from the RF waves and that harvested energy can easily be reserved or used for electronic equipment to work [6].…”

Section: Introductionmentioning

confidence: 99%

“…RF-based EH technology is studied in cooperative relaying networks [2]- [14] (and references therein), where from the received RF signals, a relay node collects energy. Dual-hop (or Two-hop) relaying is a popular technique to obtain greater capacity and larger coverage of wireless networks [14]. There are two well-known methods for relaying data: AF (amplifyand-forward) method and DF (decode-and forward) method.…”

Section: Introductionmentioning

confidence: 99%

“…In a DF relay method, the received message at the relay node is decoded first then forwarded to the next receiver or destination. Recently, a lot of research papers are written on energy harvesting in a two-hop DF relaying system in the literature [2]- [14].…”

Section: Introductionmentioning

confidence: 99%

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Non-Linear EH Relaying in Delay-Transmission Mode over n-µ Fading Channels

Hussain¹,

Ali²,

Kumar³

et al. 2019

ijacsa

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Energy harvesting is a technique to harvest energy from RF (radio frequency) waves. The RF signals have the ability to convey energy and information concurrently. The EH in cooperative relaying systems may increase the capacity and coverage of wireless networks. In this work, we study a dual-hop (two-hop) relaying. This system has three nodes: a source, a relay, and a destination. The source and destination have multiple antennas. We account a non-linear EH model and TSR (time-switchingbased relaying) protocol at the single-antenna relay node. We evaluate the system performance over η − µ fading channels. With a saturation threshold, a non-linear EH receiver restrains the harvested power. In the TSR protocol, the relay changes mode between the EH and information processing, by which a fraction of time is used with each process. The fading model η−µ incorporates some fading models as notable cases, viz., Nakagamim, One-sided Gaussian, Nakagami-q (Hoyt), and Rayleigh. The system performance is analyzed in terms of the average capacity and throughput for different saturation threshold power levels, divers antennas arrangements, and different parameter values of η and µ.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Non-Linear EH Relaying in Delay-Transmission Mode over n-µ Fading Channels

Hussain¹,

Ali²,

Kumar³

et al. 2019

ijacsa

Self Cite

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“…To combat the fading and the path loss, beamforming techniques are employed to transfer the energy in a narrow beam toward the receiver or to maximize the signal gain at the receiver, and they have consequently attracted much attention. () Besides, the use of the beamforming techniques at the source and the destination for extension of the relay systems can further improve the quality of the links …”

Section: Introductionmentioning

confidence: 99%

Nonlinear energy‐harvesting relaying with beamforming and hardware impairments in κ−μ shadowed fading environment

Hussain

Kim

Chang

2018

Trans Emerging Tel Tech

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In this paper, the energy harvesting in a decode‐and‐forward (DF) relaying system with beamforming and hardware impairments that is based on a realistic nonlinear model is studied under κ−μ shadowed fading environments. This study was undertaken in consideration of a source and a destination that are equipped with multiple antennas and communication that occurs through a single‐antenna energy‐constrained DF relay. At the relay node, a nonlinear energy harvester is assumed, which limits the level of the harvested power with a saturation threshold. Here, a power‐splitting‐based relaying protocol is considered, whereby new and exact analytical expressions are derived for the outage probability and throughput under κ−μ shadowed fading, accounting for hardware impairments at all nodes. The κ−μ shadowed fading model is capable of modeling the different kinds of empirical wireless channels that undergo either shadowing or fading and fading and shadowing simultaneously, including the particular cases of the κ−μ, Rician shadowed, Rician, Nakagami‐ truem^, and Rayleigh fading channels. The authors analyze the system performance for different system parameters such as the power splitting ratio, number of antennas, hardware impairments, saturation threshold power, and fading and shadowing parameters. These results are then generalized and can easily be reduced for an ideal hardware and linear energy‐harvesting relaying, and for a number of particular cases including the Rayleigh/Rayleigh, Nakagami‐ truem^/Nakagami‐ truem^, Rician/Rician, Rician shadowed/Rician shadowed, and mixed κ−μ shadowed, κ−μ, Rician shadowed, Rician, Nakagami‐ truem^, and Rayleigh fading channels. The results of this study are helpful in terms of the analysis of the performance of the energy‐harvesting DF relay network under a variety of environments for which the fading and the shadowing arise jointly and separately.

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“…The variable-gain relay depends on the knowledge of instantaneous channel state information (CSI) of the first hop to control the gain of the amplifier at the relay. Whereas, the AF system with the fixed-gain relay uses a fixed-gain factor at the receiver regardless of the instantaneous CSI, which is inferior in performance compared with the variable-gain relay [12].…”

Section: Introductionmentioning

confidence: 99%

On the performance of a mixed RF/MIMO FSO variable gain dual-hop transmission system

Han

Jiang

You

et al. 2018

Optics Communications

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In this work, we propose a mixed radio frequency (RF) and multiple-input-multiple-output (MIMO) free-space optical (FSO) system based on a variable-gain dual-hop relay transmission scheme. The RF channel is modeled by Rayleigh distribution and Gamma-Gamma turbulence distribution is adopted for the MIMO FSO link, which accounts for the equal gain combining diversity technique. Moreover, new closed-form mathematical formulas are obtained including the cumulative distribution function, probability density function, moment generating function, and moments of equivalent signal-to-noise ratio of the dual-hop relay system based on Meijer's G function. As such, we derive the novel analytical expressions of the outage probability, the higher-order fading, and the average bit error rate for a range of modulations in terms of Meijer's G function. Furthermore, the exact closed-form formula of the ergodic capacity is derived based on the bivariate Meijer's G function. The evaluation and simulation are provided for system performance, and the effect of spatial diversity technique is discussed as well.

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Dual-Hop Variable-Gain AF Relaying with Beamforming over k-µ Shadowed Fading Channels

Cited by 9 publications

References 14 publications

Non-Linear EH Relaying in Delay-Transmission Mode over n-µ Fading Channels

Non-Linear EH Relaying in Delay-Transmission Mode over n-µ Fading Channels

Nonlinear energy‐harvesting relaying with beamforming and hardware impairments in κ−μ shadowed fading environment

On the performance of a mixed RF/MIMO FSO variable gain dual-hop transmission system

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