Propagation Effects on Communications Satellite Link Performance

Ippolito, Louis J.

doi:10.1007/978-94-011-7027-7_9

Cited by 23 publications

(37 citation statements)

References 1 publication

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“…Figure 6 depicts the beam distribution. The majority of the simulation scenario parameters were obtained from [ 1 , 20 ]. Table 3 details some of the most important parameters.…”

Section: Resultsmentioning

confidence: 99%

“…In this paper, we consider a GEO satellite in the Ka band with

fixed point beams and a multibeam technique in the four-color frequency reuse pattern [ 1 ], as depicted in Figure 1 . When bandwidth allocation is performed, beams with different polarizations are independent of each other, whereas there is a bandwidth overlap constraint between adjacent beams using the same polarization.…”

Section: Problem Formulationmentioning

confidence: 99%

“…The carrier-to-noise power ratio of the satellite downlink can be calculated as follows [ 1 , 18 ]:

where

denotes the transmit power of the satellite antenna (assumed to be numerically equal to the power assigned to the beam);

and

denote the gain of the transmit and receive antennas, respectively;

is the output backoff factor, taken as a fixed value of 5 dB [ 20 ];

represents the receiver system noise temperature, usually at 320 K [ 1 ];

denotes the free-space path loss;

denotes the sum of other losses; and

is the beam bandwidth.…”

Section: Problem Formulationmentioning

confidence: 99%

“…Satellite communication systems have rapidly evolved into high-throughput satellite (HTS) systems over the past two decades, with data rates of tens or even hundreds of gigabits per second [ 1 ]. In the future, satellite communications will further develop into satellite–terrestrial networks [ 2 ], large-scale LEO constellations [ 3 ], or 6G networks [ 4 ], for which the efficient management of complex resources will be imperative [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

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Research on Joint Resource Allocation for Multibeam Satellite Based on Metaheuristic Algorithms

Wei

Wang

2022

Entropy

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With the rapid growth of satellite communication demand and the continuous development of high-throughput satellite systems, the satellite resource allocation problem—also called the dynamic resources management (DRM) problem—has become increasingly complex in recent years. The use of metaheuristic algorithms to obtain acceptable optimal solutions has become a hot topic in research and has the potential to be explored further. In particular, the treatment of invalid solutions is the key to algorithm performance. At present, the unused bandwidth allocation (UBA) method is commonly used to address the bandwidth constraint in the DRM problem. However, this method reduces the algorithm’s flexibility in the solution space, diminishes the quality of the optimized solution, and increases the computational complexity. In this paper, we propose a bandwidth constraint handling approach based on the non-dominated beam coding (NDBC) method, which can eliminate the bandwidth overlap constraint in the algorithm’s population evolution and achieve complete bandwidth flexibility in order to increase the quality of the optimal solution while decreasing the computational complexity. We develop a generic application architecture for metaheuristic algorithms using the NDBC method and successfully apply it to four typical algorithms. The results indicate that NDBC can enhance the quality of the optimized solution by 9–33% while simultaneously reducing computational complexity by 9–21%.

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“…Figure 6 depicts the beam distribution. The majority of the simulation scenario parameters were obtained from [ 1 , 20 ]. Table 3 details some of the most important parameters.…”

Section: Resultsmentioning

confidence: 99%

“…In this paper, we consider a GEO satellite in the Ka band with

Section: Problem Formulationmentioning

confidence: 99%

“…The carrier-to-noise power ratio of the satellite downlink can be calculated as follows [ 1 , 18 ]:

where

denotes the transmit power of the satellite antenna (assumed to be numerically equal to the power assigned to the beam);

and

denote the gain of the transmit and receive antennas, respectively;

is the output backoff factor, taken as a fixed value of 5 dB [ 20 ];

represents the receiver system noise temperature, usually at 320 K [ 1 ];

denotes the free-space path loss;

denotes the sum of other losses; and

is the beam bandwidth.…”

Section: Problem Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Research on Joint Resource Allocation for Multibeam Satellite Based on Metaheuristic Algorithms

Wei

Wang

2022

Entropy

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show abstract

“…Using the attenuation of electromagnetic signals to measure rainfall has received much attention recently. This approach is strongly supported by the theoretical basis for calculating attenuation due to the water content along a signal path, which has been established and validated by numerous propagation tests [ 1 , 2 ]. In 1991, it was suggested that custom-designed microwave links could be used for the reconstruction of rainfall fields [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Retrieval of Raindrop Size Distribution Using Dual-Polarized Microwave Signals from LEO Satellites: A Feasibility Study through Simulations

Shen

Huang

2021

Sensors

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In this paper, a novel approach for raindrop size distribution retrieval using dual-polarized microwave signals from low Earth orbit satellites is proposed. The feasibility of this approach is studied through modelling and simulating the retrieval system which includes multiple ground receivers equipped with signal-to-noise ratio estimators and a low Earth orbit satellite communicating with the receivers using both vertically and horizontally polarized signals. Our analysis suggests that the dual-polarized links offer the opportunity to estimate two independent raindrop size distribution parameters. To achieve that, the vertical and horizontal polarization attenuations need to be measured at low elevation angles where the difference between them is more distinct. Two synthetic rain fields are generated to test the performance of the retrieval. Simulation results suggest that the specific attenuations for both link types can be retrieved through a least-squares algorithm. They also confirm that the specific attenuation ratio of vertically to horizontally polarized signals can be used to retrieve the slope and intercept parameters of raindrop size distribution.

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Liquid Crystals for Advanced Smart Devices with Microwave and Millimeter‐Wave Applications: Recent Progress for Next‐Generation Communications

Choi

Park

et al. 2023

Advanced Materials

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Liquid crystals (LCs) technology have a well‐established history of applications in visible light, particularly in the display industry. However, with the rapid growth in communication technology, LCs have become a topic of current interest for high‐frequency microwave (MW) and millimeter‐wave (mmWave) applications due to promising characteristics such as tunability, continuous tuning, low losses, and price compatibility. To improve the performance of future communication technology using LCs, it is not sufficient only with the perspective of radio‐frequency (RF) technology. Therefore, it is imperative to understand not only the novel structural designs and optimization of MW engineering but also the perspective of materials engineering when implementing advanced RF devices with maximum performance for next‐generation satellite and terrestrial communication. Herein, based on advanced nematic LCs, polymer‐modified LCs, dual‐frequency LCs, and photo‐reactive LCs, this article summarizes and examines the modulation principles and key research directions for the design strategies of LCs for advanced smart RF devices with improved driving performance and novel functionality. Furthermore, the challenges in development of state‐of‐the‐art smart RF devices that use LCs are discussed.

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Propagation Effects on Communications Satellite Link Performance

Cited by 23 publications

References 1 publication

Research on Joint Resource Allocation for Multibeam Satellite Based on Metaheuristic Algorithms

Research on Joint Resource Allocation for Multibeam Satellite Based on Metaheuristic Algorithms

Retrieval of Raindrop Size Distribution Using Dual-Polarized Microwave Signals from LEO Satellites: A Feasibility Study through Simulations

Liquid Crystals for Advanced Smart Devices with Microwave and Millimeter‐Wave Applications: Recent Progress for Next‐Generation Communications

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