Techniques of rain fade countermeasures in Ka-band satellite communication on ships

Zhang, Fen; Zuo, Yanqin; Sun, He

doi:10.1109/icocn.2017.8121382

Cited by 5 publications

(6 citation statements)

References 2 publications

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“…In principle, the exploitation of higher frequency bands (e.g., Q/V) by this wireless link could address this issue. However, often this approach is not feasible in practice due to weather impairments at high frequencies (Zhang et al, 2017). A common alternative is the deployment of multiple gateways, where each gateway conveys the signals to be transmitted to a cluster of spot beams.…”

Section: Linear Precoded For Satellite Systemsmentioning

confidence: 99%

Precoded Cluster Hopping for Multibeam GEO Satellite Communication Systems

Lagunas

Kibria²,

Al-Hraishawi

et al. 2021

Front. Signal Process.

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Beam hopping (BH) and precoding are two trending technologies for high-throughput satellite (HTS) systems. While BH enables the flexible adaptation of the offered capacity to the heterogeneous demand, precoding aims at boosting the spectral efficiency. In this study, we consider an HTS system that employs BH in conjunction with precoding in an attempt to bring the benefits of both in one. In particular, we propose the concept of cluster hopping (CH), where a set of adjacent beams are simultaneously illuminated with the same frequency resource. On this line, we propose an efficient time–space illumination pattern design, where we determine the set of clusters that shall be illuminated simultaneously at each hopping event along with the dwelling time. The CH time–space illumination pattern design formulation is shown to be theoretically intractable due to the combinatorial nature of the problem and the impact of the actual illumination design on the resulting interference. For this, we make some design decisions on the beam–cluster design that open the door to a less complex still well-performing solution. Supporting results based on numerical simulations are provided which validate the effectiveness of the proposed CH concept and a time–space illumination pattern design with respect to benchmark schemes.

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Section: Linear Precoded For Satellite Systemsmentioning

confidence: 99%

Precoded Cluster Hopping for Multibeam GEO Satellite Communication Systems

Lagunas

Kibria²,

Al-Hraishawi

et al. 2021

Front. Signal Process.

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“…Except for FSL, the signal of Ka band suffered from rain attenuation greatly because the wavelength of Ka band is quite short 29 . And the influence of rain attenuation cannot be ignored.…”

Section: System Modelmentioning

confidence: 99%

The performance analysis of NOMA in LEO satellite rain attenuation and fading hybrid channel

Ning

Yang

Chen

et al. 2021

Satell Commun Network

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In the fifth-generation (5G) and future sixth-generation (6G) networks, improving spectral efficiency and system capacity is still the main concern. Adding LEO satellite to the construction of 5G and 6G can make the network structure three-dimensional, which lets the network construction get rid of the limitation of ground space propagation distance and makes the wider area enjoy the convenience of 5G and 6G. However, due to the large link distance between space and the ground, the communication of LEO satellite in Ka band is greatly affected by rain attenuation and shadow fading. In order to improve the ergodic capacity of LEO satellite downlink, this paper attempts to apply nonorthogonal multiple access (NOMA) to hybrid channels with rainfall fading and shadow fading. In the simulation results, the ergodic capacity of orthogonal frequency division multiple access (OFDMA) and NOMA is compared, and it is found that the system capacity of hybrid channel can be improved by increasing the power allocation factor of NOMA. The experiments have studied the influence of LEO satellite's orbital height, fading degree, and transmission power in the communication link on the performance of LEO satellite system in this paper.The experimental results show that the lower the orbit height is, the better system performance will become under the same fading degree. Moreover, the energy consumed gradually decreases with the transmission power becoming small.

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“…whereR i and R th i are from (7) and (10), respectively. The constraint in (18) can be replaced with P out R th i < P th out,i if the outage probability is regarded as a performance metric where P out R th i is obtained from (9) and P th out,i is the maximum allowable outage probability for ship i.…”

Section: Antenna Selection Scheme Based On Qos Requirementmentioning

confidence: 99%

“…For many decades, very high frequency-and high frequency-based communication systems have been integrated into maritime networks because they can cover a wide area [3]- [6]; however, they have small capacities and are unavailable for popular internet applications in maritime environments. As an alternative, satellite communications can provide such services [7]- [10], but it is not cost-effective for the ever-increasing level of human activity in the ocean.…”

Section: Introductionmentioning

confidence: 99%

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Hierarchical Maritime Radio Networks for Internet of Maritime Things

2019

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Despite the potential benefits of a maritime Internet of Things, a number of issues hinder its realization, including the need for wide area coverage and cost-effectiveness. Toward these needs, a model is first presented for uplink maritime radio communications that hierarchically employ Wi-Fi and cellular links for data transmission from marine user equipments (MUEs) on a ship to a cellular base station with distributed antennas (DAs) along a coastline. Then, the performances are evaluated given in terms of average data rate and outage probability in the hierarchical maritime radio networks. When evaluating the performances, heterogeneous channel characteristics of the hierarchical networks are taken into account in which Rayleigh fading is considered for the MUE-ship links, whereas shadowed-Rician fading is considered for the ship-DA links. Moreover, the effects due to various transmission errors that can be occurred at different communication layers are reflected in determining the quality of service (QoS) requirements of a ship. With the help of authors' analysis, an antenna selection algorithm is proposed under which the minimum size of a service cloud can be found to support the QoS requirements of MUEs with a ship. The numerical evaluations demonstrate the validity of the proposed algorithm. INDEX TERMS Cellular networks, distributed antenna (DA), data minimization, Internet of maritime thing (IoMT), hierarchical networks, maritime communications, quality of service (QoS), wireless communication. YUJAE SONG (S'12-M'17) received the Ph.D. degree in electrical engineering from the Korea Advanced Institute of Science and Technology (KAIST), South Korea, in 2016. He was a Visiting Scholar in communication systems with the KTH Royal Institute of Technology, Sweden, in 2015. Since 2016, he has been a Senior Researcher with the Maritime ICT R&D Center, Korea Institute of Ocean Science and Technology. His research interests include design, analysis, and optimization of various wireless communication systems including 5G, maritime/underwater, and smart grid communications. SUNG HOON LIM (S'08-M'12) received the B.S. degree (Hons.

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Techniques of rain fade countermeasures in Ka-band satellite communication on ships

Cited by 5 publications

References 2 publications

Precoded Cluster Hopping for Multibeam GEO Satellite Communication Systems

Precoded Cluster Hopping for Multibeam GEO Satellite Communication Systems

The performance analysis of NOMA in LEO satellite rain attenuation and fading hybrid channel

Hierarchical Maritime Radio Networks for Internet of Maritime Things

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