A Digital Revisitation of Analog Beam-forming Techniques for Satellite Multibeam Antennas

Angeletti, Piero; Lisi, Marco

doi:10.2514/6.2013-5709

Cited by 7 publications

(8 citation statements)

References 2 publications

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“…For instance, a fully reconfigurable Beam-Forming Network can be done using M × N control elements of the variable phase shifters and attenuators. The network generates N independent beams from M inputs of antenna elements (Angeletti and Lisi, 2013). In parallel to the channelised data (in the frequency domain), snapshots of time series data can be sampled and those corresponding to the selected events will be stored (Klein-Wolt et al, 2012).…”

Section: Data Acquisition and Data Processing Unitmentioning

confidence: 99%

Prospects of probing the radio emission of lunar UHECRv events

Aminaei¹,

Chen²,

Pourshaghaghi³

et al. 2018

Advances in Space Research

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Radio detection of Ultra High Energetic Cosmic Rays and Neutrinos (UHECRv) which hit the Moon has been investigated in recent years. In preparation for near-future lunar science missions, we discuss technical requirements for radio experiments onboard lunar orbiters or on a lunar lander. We also develop an analysis of UHECRv aperture by including UHECv events occurring in the sub-layers of lunar regolith. It is verified that even using a single antenna onboard lunar orbiters or a few meters above the Moon's surface, dozens of lunar UHECRv events are detectable for one-year of observation at energy levels of 10 18 eV to 10 23 eV. Furthermore, it is shown that an antenna 3 meters above the Moon's surface could detect lower energy lunar UHECR events at the level of 10 15 eV to 10 18 eV which might not be detectable from lunar orbiters or ground-based observations.

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Section: Data Acquisition and Data Processing Unitmentioning

confidence: 99%

Prospects of probing the radio emission of lunar UHECRv events

Aminaei¹,

Chen²,

Pourshaghaghi³

et al. 2018

Advances in Space Research

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“…The reverse operation is performed on the forward link where the architecture includes the following parts: Feeds' signals frequency and polarization multiplexing [2,3].…”

Section: Feed's Signals Frequency and Polarization Multiplexingmentioning

confidence: 99%

“…A block diagram of a hybrid OBBF/OGBF system is reported in Figure 5 Hybrid on-board/on-ground beam forming [2,3].…”

Section: Hybrid Obbf/ogbfmentioning

confidence: 99%

“…For OGBF systems with a frequency-multiplexed feeder link, the Doppler effect must be handled very carefully as it causes differential frequency and phase changes among the signals multiplexed on the feeder link [2]. For OGBF systems with a frequency-multiplexed feeder link, the Doppler effect must be handled very carefully as it causes differential frequency and phase changes among the signals multiplexed on the feeder link [2].…”

Section: Space/ground Doppler and Synchronizationmentioning

confidence: 99%

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On-ground beam forming techniques for mobile satellite systems applications

Angeletti

Cioni

Tronc³

et al. 2015

Cooperative and Cognitive Satellite Systems

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“…Conventional beamforming techniques, either analog or digital, that completely rely on the payload's processing potential (space beamforming), are nowadays far beyond the state of the art . Yet, when beamforming is fully implemented on‐ground (on‐ground beamforming) and the number of feeds is greater than the number of users, the GW and the satellite must engage in extensive communication efforts since they have to exchange the whole set of feed signals . Although this solution may seem compelling, because it drastically reduces payload complexity and allows to take advantage of full on‐ground processing flexibility, it requires a large amount of feeder‐link spectral resources, because feed signals must be frequency multiplexed both on the up‐link and on the down‐link of the feeder‐link.…”

Section: Introductionmentioning

confidence: 99%

Joint feeder‐link bandwidth compaction and interference mitigation based on a hybrid space/ground processing architecture for a broadband multi‐beam satellite system

Thibault

Devillers

Candreva

et al. 2013

Satell Commun Network

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SUMMARYIn a broadband multi‐beam satellite system, a hybrid space/ground processing has the potential to allow for a more efficient use of the feeder‐link spectral resources when the payload is equipped with a multi‐fed reflector antenna and the number of feeds exceeds the number of users to be served on‐ground. In conventional systems, where the processing burden is kept on‐ground to minimize payload complexity, the on‐ground and the space segments have to engage in extensive communication efforts on the feeder‐link to exchange the whole set of multiplexed feed signals. When spectral resources are scarce, an expensive multiple‐gateway (GW) infrastructure is required to cope with these communication efforts. As an alternative, this work suggests a hybrid architecture where the satellite and the GW are able to exchange a set of intermediate signals called feedlets, whose cardinality is smaller than the number of feeds. When this occurs, the satellite implements a fixed non‐adaptive processing called Coarse Beamforming (CB) to reconstruct feed signals from the subset of feedlets. Non‐adaptive processing keeps the payload complexity acceptable, while a gain is obtained in terms of feeder‐link bandwidth reduction. The objective of this paper is to study the implications of introducing a fixed processing scheme on‐board, the satellite for the Forward Link (FL) of a broadband multi‐beam satellite network. The first part of this work studies the effect of bandwidth compression on the quality of on‐board reconstructed feed signals.The second part focuses on the effect of coarse beamforming on the system's spectral efficiency and availability when adaptive precoding is implemented at the GW to allow for a full‐frequency‐reuse scheme. Copyright © 2013 John Wiley & Sons, Ltd.

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A Digital Revisitation of Analog Beam-forming Techniques for Satellite Multibeam Antennas

Abstract: The paper reviews analog and digital implementions of beam-forming networks focusing on some parallelism between the two solutions with emphasis on those techniques that aim at reducing the network complexity.

Cited by 7 publications

References 2 publications

Prospects of probing the radio emission of lunar UHECRv events

Prospects of probing the radio emission of lunar UHECRv events

On-ground beam forming techniques for mobile satellite systems applications

Joint feeder‐link bandwidth compaction and interference mitigation based on a hybrid space/ground processing architecture for a broadband multi‐beam satellite system

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