Imperfect channel state information of AF and DF energy harvesting cooperative networks

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The development of hybrid satellite-terrestrial relay networks (HSTRNs) is one of the driving forces for revolutionizing satellite communications in the modern era. Although there are many unique features of conventional satellite networks, their evolution pace is much slower than the terrestrial wireless networks. As a result, it is becoming more important to use HSTRNs for the seamless integration of terrestrial cellular and satellite communications. With this intent, this paper provides a comprehensive performance evaluation of HSTRNs employing non-orthogonal multiple access technique. The terrestrial relay is considered to be wireless-powered and harvests energy from the radio signal of the satellite. For the sake of comparison, both amplify-and-forward (AF) and decode-and-forward (DF) relaying protocols are considered. Subsequently, the closed-form expressions of outage probabilities and ergodic capacities are derived for each relaying protocol. Extensive simulations are performed to verify the accuracy of the obtained closed-form expressions. The results provided in this work characterize the outage and capacity performance of such a HSTRN.

Section: Related Workmentioning

confidence: 99%

Hybrid Satellite-Terrestrial Relay Network: Proposed Model and Application of Power Splitting Multiple Access

Kharel

et al. 2020

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“…Specifically, α is set to

expressed in the above equation. It should be pointed out that traditional EH-assisted systems adopt the PS scheme with fixed α [ 15 , 16 , 17 , 18 , 19 , 20 ]. Moreover, the value of α is independent of the surrounding environments, i.e., the channel from B to R. However, a dynamic value of α can be obtainable as the relay also requires the CSI of the B-R link to decode

, and thus can take advantage of this information to dynamically tune α and optimize the system performance.…”

Section: System Modelmentioning

confidence: 99%

“…EH technique outperforms other conventional EH techniques such as solar, wind, and thermoelectric energy, which mainly depend on the surrounding environments. Besides reliability and flexibility, the ability of the RF signals to simultaneously carry both information and energy can be considered as another major advantage of the RF-EH scheme [15][16][17][18][19][20]. The simultaneous wireless information and power transfer (SWIPT) technique was introduced along with its performance in [17].…”

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of Cognitive Relay-Assisted Ambient Backscatter with MRC over Nakagami-m Fading Channels

Nguyen

Lee

2020

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This study presents ambient backscatter communication (AmBC) network as a concept of "modulation in the air" that has drawn growing interest by both academia and industry recently. In particular, we investigate and analyze an AmBC system relying on cognitive radio, where the primary destination is equipped with multiple antennas and maximum ratio combining (MRC). A wireless powered relay is necessary to serve both primary and secondary destinations. Benefiting from the surrounding radio frequency (RF) source, the relay can support the backscattering signal. To facilitate the performance analysis of received nodes, this study presents exact closed-form expressions of the outage probability. For comparison, the outage and throughput performance of these nodes are considered in numerical simulation. Taking advantage of the AmBC technology, the impact of the backscatter ratio on system performance is carefully studied considering various other parameters. Simulation results demonstrate the exactness of the derived outage probabilities and show that the optimal throughput performance can be achieved at specific parameters.

“…Saving on energy consumption or extending the battery life for sensor nodes has become an important research issue in wireless sensor networks. Recently, energy harvesting (EH) has attracted enormous attention from researchers as a promising cost-effective technique to maximize energy efficiency of a wireless network [ 3 , 4 , 5 ], especially in wireless sensor networks [ 6 , 7 , 8 , 9 ]. Various energy harvesting sources have been studied, such as natural sources (solar [ 10 ], wind [ 11 ], thermal [ 12 ], etc.…”

Section: Introductionmentioning

confidence: 99%

Energy Harvesting over Rician Fading Channel: A Performance Analysis for Half-Duplex Bidirectional Sensor Networks under Hardware Impairments

Nguyen

Minh

Tran

et al. 2018

In this paper, a rigorous analysis of the performance of time-switching energy harvesting strategy that is applied for a half-duplex bidirectional wireless sensor network with intermediate relay over a Rician fading channel is presented to provide the exact-form expressions of the outage probability, achievable throughput and the symbol-error-rate (SER) of the system under the hardware impairment condition. Using the proposed probabilistic models for wireless channels between mobile nodes as well as for the hardware noises, we derive the outage probability of the system, and then the throughput and SER can be obtained as a result. Both exact analysis and asymptotic analysis at high signal-power-to-noise-ratio regime are provided. Monte Carlo simulation is also conducted to verify the analysis. This work confirms the effectiveness of energy harvesting applied in wireless sensor networks over a Rician fading channel, and can provide an insightful understanding about the effect of various parameters on the system performance.