Near Optimal Timing and Frequency Offset Estimation for 5G Integrated LEO Satellite Communication System

Wang, Wenjin; Tong, Yushan; Li, Lingxuan; Lu, An-An; You, Li; Gao, Xiqi

doi:10.1109/access.2019.2935038

Cited by 71 publications

(31 citation statements)

References 30 publications

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“…Without loss of generality, the simulation results are obtained through 10 6 independent channel realizations, and the system parameters are provided in Table I, which are chosen according to real-world use cases. Besides, we consider the Doppler Frequency Shift, caused by the mobility of the satellite, can be estimated perfectly and mitigated by the mature pre-compensation method [42].…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

Auction-Based Multichannel Cooperative Spectrum Sharing in Hybrid Satellite-Terrestrial IoT Networks

Zhang

Guo

et al. 2021

IEEE Internet Things J.

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In this paper, we investigate the multi-channel cooperative spectrum sharing in hybrid satellite-terrestrial internet of things (IoT) networks with the auction mechanism, which is designed to reduce the operational expenditure of the satellitebased IoT (S-IoT) network while alleviating the spectrum scarcity issues of terrestrial-based IoT (T-IoT) network. The cluster heads of selected T-IoT networks assist the primary satellite users transmission through cooperative relaying techniques in exchange for spectrum access. We propose an auction-based optimization problem to maximize the sum transmission rate of all primary S-IoT receivers with the appropriate secondary network selection and corresponding radio resource allocation profile by the distributed implementation while meeting the minimum transmission rate of secondary receivers of each T-IoT network. Specifically, the one-shot Vickrey-Clarke-Groves (VCG) auction is introduced to obtain the maximum social welfare, where the winner determination problem is transformed into an assignment problem and solved by the Hungarian algorithm. To further reduce the primary satellite network decision complexity, the sequential Vickrey auction is implemented by sequential fashion until all channels are auctioned. Due to incentive compatibility with those two auction mechanisms, the secondary T-IoT cluster yields the true bids of each channel, where both the non-orthogonal multiple access (NOMA) and time division multiple access (TDMA) schemes are implemented in cooperative communication. Finally, simulation results validate the effectiveness and fairness of the proposed auction-based approach as well as the superiority of the NOMA scheme in secondary relays selection. Moreover, the influence of key factors on the performance of the proposed scheme is analyzed in detail.

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Section: Simulation Results and Discussionmentioning

confidence: 99%

Auction-Based Multichannel Cooperative Spectrum Sharing in Hybrid Satellite-Terrestrial IoT Networks

Zhang

Guo

et al. 2021

IEEE Internet Things J.

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“…In this section, simulation results are provided to evaluate the performance analysis of downlink NOMA in LEO satellite communication system. Some parameters used in LEO satellite link are summarized in TABLE 1 [36], [37]. We set ϕ 1 = 0.1 • , ϕ 2 = 0.3 • , ϕ 3dB = 0.4 • , PL gk = 0, PL sk = 0, PL ek = 0, σ SF k = 4 dB, the Rician factor K 1 = 40 dB, K 2 = 20 dB.…”

Section: Numerical Resultsmentioning

confidence: 99%

The Performance Analysis of Downlink NOMA in LEO Satellite Communication System

2020

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Non-orthogonal multiple access (NOMA) has the potential to provide higher throughput than conventional orthogonal multiple access (OMA), which has been considered as a key technology for 5G. NOMA in satellite communication system can provide anytime, anywhere access with improved spectral efficiency and system capacity because of its ubiquitous coverage. However, the characteristics of the satellite channels are different from that of the terrestrial network, i.e., huge time delay and Doppler shift. In this paper, different from the existing works, which mainly focus on the performance of NOMA in static terrestrial base stations and Geostationary orbit (GEO) scenarios, we investigate the performance analysis of downlink NOMA in dynamic low earth orbit (LEO) satellite communication system with Doppler shift considered. We combine NOMA and orthogonal frequency division multiplexing (OFDM) for better spectral efficiency. Our channel model includes both small scale model and large scale model. For simplify, we only consider two users in one spot beam. Besides, we express the performance analysis of downlink NOMA in LEO satellite communication system, like ergodic capacity, outage probability (OP) and mutual information. However, in traditional NOMA scheme, the proceeding error decision of the high power user will cause the deterioration of the subsequent detection performance. Therefore, a symmetrical coding (SC) scheme for different modulation mode is proposed for low power users to get better performance. Finally, simulation results validate the performance of the NOMA scheme is better than that of the OMA scheme. The proposed SC scheme can achieve a prominent increase performance contrasted to the traditional NOMA scheme. INDEX TERMS LEO satellite communication system, NOMA, ergodic capacity, outage probability, mutual information, symmetrical coding scheme. AIJUN LIU (Member, IEEE) received the B.S. degree in microwave communications and the M.S. and Ph.D. degrees in communications engineering and information systems from the College of Communications Engineering, Army Engineer

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“…Locations of aerial networking components need to be available against security attacks. Considering the dense LEO constellations to be deployed in the near future within the plans of SpaceX, and Amazon with Project Kuiper, the Doppler shifts and propagation delay variation may reach 55 kHz and 20 𝜇s/s, respectively [15]. Drone-mounted aerial BS or cargo drones that are connected to the wireless networks as user equipment nodes also have high mobility capability, along with (secure) localization requirements.…”

Section: Effective Countermeasures Against Localization Attacksmentioning

confidence: 99%

Localization Threats in Next-Generation Wireless Networks

Goztepe¹,

Büyükçorak²,

Kurt³

et al. 2021

Preprint

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The impact of localization systems in our daily lives is increasing. As next-generation networks will introduce hyperconnectivity with the emerging applications, this impact will undoubtedly further increase, proliferating the importance of the location information's reliability. As society becomes more dependent on this information in terms of the products and services, security solutions will have to be enriched to provide countermeasures sufficiently advanced to ever-evolving threats, forcing the joint design of communication and localization systems. This paper envisions integrated communication and localization systems by focusing on localization security. Also, conventional and next-generation attacks on localization are discussed along with an efficient attack detection method and test-bed-based demonstration, highlighting the need for effective countermeasures. I. INTRODUCTIONThe progress in user companion devices equipped with rich communication capabilities and advanced computational intelligence forces wireless networks to enable the emerging computation-hungry and delay-sensitive services. These trends, in addition to revealing more stringent communication requirements in terms of rate-reliability-latency, also trigger precise and highly accurate secure localization systems. From the product and services perspectives, the research path towards 6G dauntingly forces the design of integrated wireless communication and localization systems (ICLS), as visualized in Fig. 1.The research community has been working on localization systems with a mission-critical part of various civilian and military applications for decades. Current well-established solutions include GNSS-based localization for outdoors and WiFi/Bluetooth-based localization for indoors. These solutions provide a limited accuracy, depending on the environment and products 3-10 meters (m) resolution for GNSS and 0.3-2.5 m for WiFi/Bluetooth [1], [2]. Nevertheless, localization remains an active research area regarding the achieved performances and the practical implementations, particularly in the emerging

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Near Optimal Timing and Frequency Offset Estimation for 5G Integrated LEO Satellite Communication System

Cited by 71 publications

References 30 publications

Auction-Based Multichannel Cooperative Spectrum Sharing in Hybrid Satellite-Terrestrial IoT Networks

Auction-Based Multichannel Cooperative Spectrum Sharing in Hybrid Satellite-Terrestrial IoT Networks

The Performance Analysis of Downlink NOMA in LEO Satellite Communication System

Localization Threats in Next-Generation Wireless Networks

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