Realizable feed-element patterns for multibeam reflector antenna analysis

Rahmat‐Samii, Y.; Cramer, P. W.; Woo, K.; Lee, S.

doi:10.1109/tap.1981.1142678

Cited by 32 publications

(4 citation statements)

References 2 publications

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“…In our numerical results, we will model the element radiation pattern g (θ) in (2), as a function of the elevation θ only, assuming a circular-symmetric direct radiating antenna (DRA) [12]: g (θ) = √ Γ cos q (θ), where q = (Γ − 2)/4, and Γ = 4πAµ is the peak gain of the radiating element, with A and µ denoting the DRA elementary cell area and the (linear) radiating element efficiency, respectively. However, our approach applies to any FoA and any element radiation pattern -the relevant performance can be evaluated using the Matlab code available from the authors upon request.…”

Section: Model and Analysis Of The Formation Of Arraysmentioning

confidence: 99%

“…In writing (12), we have explicitly identified the contribution of the FoA ζ ′ (ϕ, θ) and the one provided by the single array ζ ′′ (ϕ, θ), showing that the overall pattern is the superposition of two different effects. The directivity of the FoA can be augmented by either increasing the number of arrays S, or by enlarging the array spacing ∆, in order to achieve a sufficiently narrow main beam.…”

Section: A Analysis Of the Radiation Patternmentioning

confidence: 99%

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Formation-of-Arrays Antenna Technology for High-Throughput Mobile Non-Terrestrial Networks

Bacci

Gaudenzi

Luise

et al. 2023

IEEE Trans. Aerosp. Electron. Syst.

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Effective integration of terrestrial and nonterrestrial segments is one of the key research avenues in the design of current and future wireless communication networks. To this aim, modern communication-satellite constellations intend to attain sufficiently high throughput in terms of bit rate per unit area on the ground by rather aggressive patterns of spatial frequency reuse. This goal calls for on-board narrow-beam antennas, whose size turns out to be in many cases incompatible with the size/mass and accommodation constraints of the hosting satellite. This paper investigates the attainable performance of large distributed arrays of antennas implemented as the ensemble of a few to many simpler sub-antennas of smaller sizes, carried by one (small) satellite each. The sub-antennas can in their turn be implemented like (regular) 2D arrays of simple radiating elements, realizing an overall (distributed) antenna architecture that we call "formation of arrays" (FoA). The satellites that implement this radiating architecture need to be relatively close to each other and constitute a formation of flying objects, to be coordinated and controlled as a whole. In this paper, we develop a theoretical analysis of an FoA antenna, and we show how to take advantage of this new technology to improve network throughput in a multi-beam S-band mobile communication network with low-earth or geostationary orbiting satellites directly providing 5G-like communication services to hand-held user terminals.

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Section: Model and Analysis Of The Formation Of Arraysmentioning

confidence: 99%

Section: A Analysis Of the Radiation Patternmentioning

confidence: 99%

Formation-of-Arrays Antenna Technology for High-Throughput Mobile Non-Terrestrial Networks

Bacci

Gaudenzi

Luise

et al. 2023

IEEE Trans. Aerosp. Electron. Syst.

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show abstract

“…• exp[jk 0 (x n sin ϑ cos φ + y n sin ϑ sin φ)], (5) being k 0 = 2π/λ the free-space wave-number, λ = f 0 /c the free-space wavelength, f 0 the carrier frequency and c the speed of light. Concerning the element radiation pattern g E (ϑ, φ), the simple rotationally symmetric model discussed in [18] has been used with g E (ϑ, φ) = g E (ϑ) defined as…”

Section: ) Active Antenna Channel Modelmentioning

confidence: 99%

A Pragmatic Approach to Massive MIMO for Broadband Communication Satellites

Angeletti

Gaudenzi

2020

IEEE Access

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In this paper, we analyze the performance of Massive Multiple Input Multiple Output (M-MIMO) techniques aiming at increasing the throughput of broadband satellites. In particular, we investigate a "pragmatic" approach to the design of the M-MIMO to ease its implementation both at system and satellite payload level. We compare the performance of optimized classical Minimum Mean Square Error (MMSE), Zero Forcing (ZF), Matched Filter (MF) schemes with the proposed "pragmatic" M-MIMO one dubbed fixed Multi-Beam (MB). To further boost the M-MIMO performance, a novel radio resource management approach based on Mixed Integer Quadratic Programming (MIQDP-RRM) is proposed. The adoption of MIQDP-RRM is shown to greatly enhance the M-MIMO throughput performance. It is shown that the MB scheme closely approximate the MF, ZF and MMSE performance with a much simpler active antenna-based payload architecture and without requiring any user channel estimation. The MB MIQDP-RRM M-MIMO pragmatic solution allows to achieve higher satellite broadband throughput compared to a conventional four colors frequency reuse scheme (CFR) with affordable complexity for both space and ground segments. At the same time we show that by non-conventional CFR multi-beam array design, the performance gap compared to MB MIQDP-RRM M-MIMO can be significantly reduced.

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“…, with no azimuth dependence [33]. Furthermore, the q-factor can be formulated as a function of the gain as q = 1 4 G R − 1 2 [27].…”

Section: System Modelmentioning

confidence: 99%

Smart Beamforming for Direct LEO Satellite Access of Future IoT

Caus

Pérez-Neira

Mendez

2021

Sensors

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Non-terrestrial networks (NTN) are expected to play a key role in extending and complementing terrestrial 5G networks in order to provide services to air, sea, and un-served or under-served areas. This paper focuses the attention on the uplink, where terminals are able to establish a direct link with the NTN at Ka-band. To reduce the collision probability when a large population of terminals is transmitting simultaneously, we propose a grant-free access scheme called resource sharing beamforming access (RSBA). We study RBSA for low Earth orbit (LEO) satellite communications with massive multiple-input multiple-output (MIMO). The idea is to benefit from the spatial diversity to decode multiple overlapped signals. We have devised a blind and open-loop beamforming technique, where neither the receiver must carry out brute-force search in azimuth and elevation, nor are the terminals required to report channel state information. Upon deriving the theoretical throughput, we show that RBSA is appropriate for grant-free access to LEO satellite, it reduces the probability of collision, and thus it increases the number of terminals that can access the media. Practical implementation aspects have been tackled, such as the estimation of the required statistics, and the determination of the number of users.

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Realizable feed-element patterns for multibeam reflector antenna analysis

Cited by 32 publications

References 2 publications

Formation-of-Arrays Antenna Technology for High-Throughput Mobile Non-Terrestrial Networks

Formation-of-Arrays Antenna Technology for High-Throughput Mobile Non-Terrestrial Networks

A Pragmatic Approach to Massive MIMO for Broadband Communication Satellites

Smart Beamforming for Direct LEO Satellite Access of Future IoT

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