Wideband Analysis of the Satellite Communication Channel at Ku- and X-Bands

Cid, E. Lemos; Sánchez, Manuel García; Alejos, Ana Vázquez

doi:10.1109/tvt.2015.2425037

Cited by 21 publications

(11 citation statements)

References 15 publications

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“…A test campaign on 300 km of rail line (about 10,000 km of tests) has been carried out to evaluate the performance of cellular and satellite networks in a railway environment. Results in terms of achievable link reliability and end-to-end (E2E) delays are encouraging for the adoption of a public land mobile network (PLMN)/satellite approach to export ERTMS/ETCS procedures [22].…”

Section: Network Design For Critical and Noncritical Communicationsmentioning

confidence: 98%

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Wireless Communications in Smart Rail Transportation Systems

Briso-Rodríguez

Guan

Yin

et al. 2017

Wireless Communications and Mobile Computing

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Railway, subway, airplane, and other transportation systems have drawn an increasing interest on the use of wireless communications for critical and noncritical services to improve performance, reliability, and passengers experience. Smart transportation systems require the use of critical communications for operation and control, and wideband services can be provided using noncritical communications. High speed train (HST) is one of the best test cases for the analysis of communication links and specification of the general requirements for train control and supervision, passenger communications, and onboard and infrastructure wireless sensors. In this paper, we analyze in detail critical and noncritical networks mainly using the HST as a test case. First, the different types of links for smart rail transportation are described, specifying the main requirements of the transportation systems, communications, and their applications for different services. Then, we propose a network architecture and requirements of the communication technologies for critical and noncritical data. Finally, an analysis is made for the future technologies, including the fifth-generation (5G) communications, millimeter wave (mmWave), terahertz (THz), and satellites for critical and high-capacity communications in transportation.

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Section: Network Design For Critical and Noncritical Communicationsmentioning

confidence: 98%

“…This link currently allows up to 100 Mbps using antennas with automatic azimuth control and low profile elevation that can be simply installed on top of the train [22], and in the future, the capacity will be increased to 1 Gbps.…”

Section: Gsm-r Qos Parameter For Etcs Requirementmentioning

confidence: 99%

Wireless Communications in Smart Rail Transportation Systems

Briso-Rodríguez

Guan

Yin

et al. 2017

Wireless Communications and Mobile Computing

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“…Aforementioned channel models composed of two distributions are oversimplified and not flexible to depict the channel characteristics under kinds of weather conditions and environments separately and clearly. For classifying different channel states and describing the received power level changes over time, the Markov chain process has been widely used to model satellite communication channels, such as [12], [16], [22]- [25]. It defines specified number of states with specified probability depending only on the previous state.…”

Section: Introductionmentioning

confidence: 99%

“…The hidden Markov models and dynamic higher order Markov state models provide better balance between complexity and accuracy. The channel models in [12], [23]- [25] proposed Markov-chain-based channel models for satellite systems at L-band, Ku-band, Ku-band, and X-band, respectively. While the traditional satellite communications service at L-band (1-2 GHz), C-band (4-8 GHz), X-band (8)(9)(10)(11)(12), and Ku-band (12)(13)(14)(15)(16)(17)(18), the increasing need for higher bandwidth for reducing costs drives the exploitation of millimeter wave (mmW) bands.…”

Section: Introductionmentioning

confidence: 99%

Channel Modeling for Satellite Communication Channels at Q-Band in High Latitude

et al. 2019

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This paper proposes a three-dimensional (3D) channel model for satellite communications at Q-band in a high latitude, including the path loss, shadowing, and small-scale fading. The shadowing effect is modelled by a Markov chain. The three states in the Markov chain are separated by the threshold of the received power level for the link budget and system optimization. The probability density function (PDF) of shadowing amplitude is modelled by a mixture of two Gaussian distributions with parameters obtained by the expectation-maximum (EM) algorithm. The small-scale fading is represented by a 3D geometrybased stochastic model (GBSM) where scatterers are located on the spherical surface of a hemisphere. The movement of the receiver and the Rician factor influenced by environment scattering are considered. Statistical properties including the local temporal autocorrelation function (ACF) and Wigner-Ville spectrum are derived. The satellite communication channel measurement at Q-band is conducted on the campus of Heriot-Watt University (HWU) in Edinburgh, UK. The parameters of our proposed channel model are estimated by the measurement data. Numerical and simulation results demonstrate that our proposed channel model has the ability to reproduce main statistical properties which are also consistent well with the corresponding theoretical and measurement results.

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“…In [14], Meedović and Šuka presented a survey of several propagation software packages, which included physical-based statistical methods, such as Okumura-Hata, OPAR, Triple Path Geodesic and Walfish-Ikegami, in addition to a deterministic RT method for terrestrial propagation in urban environments using a canyon model. Iglesias and Sánchez [15] and Lemos Cid et al [16] presented a statistical wide-band analysis for low-elevation satellites based on measured data for channel characterization considering urban, suburban, rural, lightly wooded and heavily wooded environments. In [17]- [19], a narrow-band technique was applied for detecting the Global Navigation Satellite System (GNSS) availability in different geographical areas.…”

Section: Introductionmentioning

confidence: 99%

New Modified Urban Canyon Models for Satellite Signal Propagation Prediction

Hadidianmoghadam

Kouki

2019

IEEE Access

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The effects of high-rise buildings on satellite propagation in the vicinity of urban canyons are investigated. A comparison between a conventional canyon model and the two modified canyon models, which take into account the presence of high-rise buildings, is presented for both narrow-band and wideband signal cases. The narrow band is developed using ray tracing (RT) and includes the direct wave, the specular reflection from building walls and ground, and the diffracted waves. In addition, multiple shadow boundaries are defined and used to carry out the uniform theory of diffraction calculations. The incident shadow boundary is the dominant boundary and is used to determine the line-of-sight region for all cases, while wall and ground reflection shadow boundaries are used to obtain higher precision due to multiple reflections. The wideband model is developed by applying a channel transfer function to the data obtained from the RT method. The proposed models are used to predict the received signal in a realistic urban environment from satellites. The models are applicable to any satellite link application, such as global navigation satellite systems, low Earth-orbiting, and high-altitude platform systems, and the results are obtained for a satellite transmitting two linearly polarized signals at a frequency of 1.625 GHz. It is found that the presence of highrise buildings next to a street canyon can significantly alter the visibility of satellites, which, in turn, lead to an increase in path loss. Consequently, ignoring high-rise buildings in the proximity of a street canyon can lead to a path loss difference of as much as 30 dB. INDEX TERMS Street canyon, conventional canyon model (CCM), non-line of sight (NLOS), ray tracing (RT), uniform theory of diffraction (UTD).

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Wideband Analysis of the Satellite Communication Channel at Ku- and X-Bands

Cited by 21 publications

References 15 publications

Wireless Communications in Smart Rail Transportation Systems

Wireless Communications in Smart Rail Transportation Systems

Channel Modeling for Satellite Communication Channels at Q-Band in High Latitude

New Modified Urban Canyon Models for Satellite Signal Propagation Prediction

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