Enhancing Spectrum Efficiency for Multiple Users in Hybrid Satellite-Terrestrial Networks

Nguyen, Nhat-Tien; Nguyen, Hong-Nhu; Nguyen, Ngoc-Long; Le, Anh‐Tu; Do, Dinh‐Thuan; Vozňák, Miroslav

doi:10.1109/access.2021.3069247

Cited by 8 publications

(7 citation statements)

References 39 publications

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“…To the best of our knowledge, the NOMA-based HSTRN with mmWave network has not yet been disclosed. And this paper is an expansion of [6], [28], and [37]. In particular, the following can be summarized as our significant contributions.…”

Section: B Motivations and Contributionsmentioning

confidence: 99%

“…This algorithm could quickly get the BF weight vector and power coefficient [27]. In order to collaborate with the primary satellite network for dynamic spectrum access, the secondary terrestrial network and overlay cognitive integrated satellite-terrestrial relay network (CISTRN) based on NOMA were examined in [28] and [29]. Moreover, the authors in [30] analyzed the performance of the secondary network when the near user employed the full-duplex mode and used the DF protocol to enhance the performance of far user in NOMA network.…”

Section: A Relate Workmentioning

confidence: 99%

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Performance Analysis of NOMA-Based Hybrid Satellite-Terrestrial Relay System Using mmWave Technology

Nguyen

et al. 2023

IEEE Access

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This paper investigates the performance of NOMA-based hybrid Satellite-Terrestrial relays system (HSTR) using the millimeter wave (mmWave) technology. Furthermore, the relays are equipped with multiple antennas and utilize the amplify and forward (AF) protocol to forward the satellite's superimposed information to multiple destinations. Then, the rain coefficient is considered as the fading factor of the mmWave band to choose the best relay. We considered the shadowed-Rician fading and Nakagami-m fading for satellite links and terrestrial links respectively, and in addition, we evaluated the shadowing effect for satellite links with two modes of: frequent heavy shadowing (FHS) and average shadowing (AS). With these suggestions, the closed-form outage probability (OP) and approximate ergodic capacity (EC) are derived to evaluate the efficiency of the proposed system. Next contribution of the research is an asymptotic analysis for the OP, which is derived in order to gain additional insight into important system parameters. Finally, the theoretical derivation is validated through simulation results and analyzed the impact of significant parameters. These results demonstrate NOMA's superiority to the traditional orthogonal multiple access (OMA) method in the proposed system.INDEX TERMS NOMA, hybrid satellite-terrestrial relay system, millimeter wave, rain attenuation, outage probability, ergodic capacity. I. INTRODUCTIONRecently, satellite communication (SatCom) has been one of the potential technologies for the fifth generation (5G) network and beyond, which brings many advantages such as high throughput, great reliability, extensive coverage, inexpensive operations, and energy-efficient [1], [2], [3]. Therefore, the integration of SatCom into current terrestrial communication systems has received considerable attentionThe associate editor coordinating the review of this manuscript and approving it for publication was Abdel-Hamid Soliman .

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Section: B Motivations and Contributionsmentioning

confidence: 99%

Section: A Relate Workmentioning

confidence: 99%

Performance Analysis of NOMA-Based Hybrid Satellite-Terrestrial Relay System Using mmWave Technology

Nguyen

et al. 2023

IEEE Access

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“…Remarkably, in the medium and high SNR ranges, User 2's achievable capacity converges to a constant because interferences in the instantaneous SINRs at User 2 rise as the average SNR increases. Conversely, the interferences experienced by User 1 intensify as the average SNR rises, as demonstrated in Equations ( 36), (39), (44) and (48). Consequently, it is evident that the ergodic capacity of User 2 in Figure 1 outperforms that of User 2 in Figure 2.…”

Section: Parameters Notation Valuesmentioning

confidence: 99%

Exploiting User Clustering and Fixed Power Allocation for Multi-Antenna UAV-Assisted IoT Systems

Nguyen

et al. 2023

Sensors

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Internet of Things (IoT) systems cooperative with unmanned aerial vehicles (UAVs) have been put into use for more than ten years, from transportation to military surveillance, and they have been shown to be worthy of inclusion in the next wireless protocols. Therefore, this paper studies user clustering and the fixed power allocation approach by placing multi-antenna UAV-mounted relays for extended coverage areas and achieving improved performance for IoT devices. In particular, the system enables UAV-mounted relays with multiple antennas together with non-orthogonal multiple access (NOMA) to provide a potential way to enhance transmission reliability. We presented two cases of multi-antenna UAVs such as maximum ratio transmission and the best selection to highlight the benefits of the antenna-selections approach with low-cost design. In addition, the base station managed its IoT devices in practical scenarios with and without direct links. For two cases, we derive closed-form expressions of outage probability (OP) and closed-form approximation ergodic capacity (EC) generated for both devices in the main scenario. The outage and ergodic capacity performances in some scenarios are compared to confirm the benefits of the considered system. The number of antennas was found to have a crucial impact on the performances. The simulation results show that the OP for both users strongly decreases when the signal-to-noise ratio (SNR), number of antennas, and fading severity factor of Nakagami-m fading increase. The proposed scheme outperforms the orthogonal multiple access (OMA) scheme in outage performance for two users. The analytical results match Monte Carlo simulations to confirm the exactness of the derived expressions.

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“…Also, the RF sub-link between the relay and the destination is assumed to follow Nakagami-m distribution, and the PDF of the ink instantaneous SNR can be defined as [31]:…”

Section: Rismentioning

confidence: 99%

On the Performance of Reconfigurable Intelligent Surface in Cooperative Decode-and-Forward Relaying for Hybrid Rf/Fso Systems

Odeyemi¹,

Owolawi²,

Olakanmi³

2022

PIER M

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Reconfigurable intelligent surface (RIS) has been suggested as a promising solution to prevent wireless communication systems from transmission blockage. In this paper, the performance of reconfigurable intelligent surface in cooperative decode-and-forward relaying for hybrid radio frequency (RF)/free space optical (FSO) system is evaluated where parallel transmission of information occurs on the system downlink. In this network, the RF links in the system are assumed to follow Nakagami-m distributions while the FSO link is subjected to Gamma-Gamma distribution. Thus, the exact closedform expressions of the system outage probability and average bit error rate are obtained to quantify the system performance. The accuracy of these expressions is justified by Monte-Carlo simulations. Also, to get more physical insight from the derived outage probability expression, the asymptotic outage probability under the condition of higher signal-to-noise ratio (SNR) is provided. In addition, the results illustrate that the system and channel parameters significantly affect the performance of the concerned system. Furthermore, the results show that RIS-hybrid downlink system offers better performance than hybrid downlink system without RIS. Under the RIS system, the results demonstrate that RIS-hybrid downlink system outperforms RIS-FSO downlink system.

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Enhancing Spectrum Efficiency for Multiple Users in Hybrid Satellite-Terrestrial Networks

Cited by 8 publications

References 39 publications

Performance Analysis of NOMA-Based Hybrid Satellite-Terrestrial Relay System Using mmWave Technology

Performance Analysis of NOMA-Based Hybrid Satellite-Terrestrial Relay System Using mmWave Technology

Exploiting User Clustering and Fixed Power Allocation for Multi-Antenna UAV-Assisted IoT Systems

On the Performance of Reconfigurable Intelligent Surface in Cooperative Decode-and-Forward Relaying for Hybrid Rf/Fso Systems

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