A Hybrid Beamforming Design for Massive MIMO LEO Satellite Communications

Palacios, Joan; González–Prelcic, Nuria; Mosquera, Carlos; Shimizu, Takayuki; Wang, Chang‐Heng

doi:10.3389/frspt.2021.696464

Cited by 30 publications

(15 citation statements)

References 11 publications

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“…In satellite communication systems, due to the limitation of the on-board radio-frequency (RF) chains caused by the confined device complexity and transmission power, hybrid analog and digital beamforming is a promising method to balance performances and hardware constraints. In [6], a hybrid beamforming strategy was used for massive multipleinput multiple-output LEO satellite communications. Later, the authors in [7] investigated hybrid beamforming method for reconfigurable intelligent surface-assisted secure integrated terrestrial-aerial networks.…”

Section: Introductionmentioning

confidence: 99%

“…In [8], an adaptive user scheduling method was proposed to mitigate intra-beam and inter-beam interference under the single-satellite scenario. Nevertheless, cooperation among multiple satellites was not taken into account in [6]- [8]. The authors in [9] proposed a multilevel clustering algorithm and a cross-cluster grouping algorithm to realize user scheduling, which considered the multi-satellite cooperation, but the user scheduling was only dependent on the positions of users.…”

Section: Introductionmentioning

confidence: 99%

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Joint Hybrid Beamforming and User Scheduling for Multi-Satellite Cooperative Networks

Zhang¹,

Sun²,

Tao³

et al. 2023

Preprint

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In this paper, we consider a cooperative communication network where multiple satellites provide services for ground users (GUs) (at the same time and on the same frequency). The communication and computational resources on satellites are usually restricted and the satellite-GU link determination affects the communication performance significantly when multiple satellites provide services for multiple GUs in a collaborative manner. Therefore, considering the limitation of the on-board radio-frequency chains, we first propose a hybrid beamforming method consisting of analog beamforming for beam alignment and digital beamforming for interference mitigation. Then, to establish appropriate connections between satellites and GUs, we propose a heuristic user scheduling algorithm which determines the connections according to the total spectral efficiency (SE) increment of the multi-satellite cooperative network. Next, a joint hybrid beamforming and user scheduling scheme is proposed to dramatically improve the performance of the multi-satellite cooperative network. Moreover, simulations are conducted to compare the proposed schemes with representative baselines and analyze the key factors influencing the performance of the multisatellite cooperative network. It is shown that the proposed joint beamforming and user scheduling approach can provide 47.2% SE improvement on average as compared with its non-joint counterpart.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Joint Hybrid Beamforming and User Scheduling for Multi-Satellite Cooperative Networks

Zhang¹,

Sun²,

Tao³

et al. 2023

Preprint

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“…In these works, the objective has been that of increasing the overall throughput in unicast or multicast systems, also addressing well-known issues for SatCom-based beamforming as scheduling and Channel State Information (CSI) retrieval. Finally, the design of hybrid beamforming for massive Multiple Input Multiple Output (MIMO) communications in LEO systems has been recently addressed in, [9]; here, the authors focus on a specific implementation of an on-board beamforming codebook compatible with 3GPP New Radio (NR). A thorough survey on MIMO techniques applied to SatCom is provided in [4], where both fixed and mobile satellite systems are examined and the major impairments related to the channel are identified.…”

Section: Introductionmentioning

confidence: 99%

Location-assisted precoding in 5G LEO systems: architectures and performances

Guidotti¹,

Amatetti²,

Arnal³

et al. 2022

Preprint

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Satellite communication systems are a fundamental component in support of Europe's ambition to deploy smart and sustainable networks and services for the success of its digital economy. To cope with the 5G and beyond ever increasing demand for larger throughput, aggressive frequency reuse schemes (i.e., full frequency reuse), with the implementation of precoding/beamforming to cope with the massive co-channel interference, are recognised as one of the key technologies. While the best performance can be obtained with the knowledge of the Channel State Information (CSI) at the transmitter, this also poses some technical challenges related to signalling and synchronisation. In this paper, we focus on precoding solutions that only needs the knowledge of the users' positions at the transmitter side, namely the recently introduced Switchable Multi-Beam (MB) and Spatially Sampled MMSE (SS-MMSE) precoding. Compared to the vast majority of the studies in the literature, we take into account both the users' and the satellite movement in a Low Earth Orbit (LEO) mega-constellation, also proposing two system architectures. The extensive numerical assessment provides a valuable insight on the performance of these two precoding schemes compared to the optimal MMSE solution.

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“…1. Digital Beam Forming (DBF) is becoming quite demanded either for satellite or mobile communications, however, due to the numerous current issues of DBF [72], Hybrid Beam Formings (HBF) are the most widely used nowadays [77][78][79].…”

Section: Discussionmentioning

confidence: 99%

“…Through the usage of analog beamformers in the RF and digital beamformers in the baseband domains, hybrid beamfromings can be a good commitment bewteen complexity, power consumption and weight and size. This sort of beamformer is being widely used for mobile and satellite communications [77][78][79].…”

Section: Beamforming Networkmentioning

confidence: 99%

Enhanced substrate integrated waveguide slot arrays for radiofrequency worldwide coverage systems

Sebastián¹

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This paper presents a novel slotted array for dual-band and circular-polarized applications. Two different propagation modes within a Substrate Integrated Waveguide (SIW), 𝑇 𝐸 10 and 𝑇 𝐸 20 , feed at the same time two pairs of slots, aimed at different frequency bands. The pairs are properly placed to be illuminated by an only propagation mode, whereas the magnetic field of the other propagation mode presents a null. Unlike many dual-band slot arrays, this novel antenna holds the same beam tilt for both frequency bands by a new method, which is only feasible through the use of two propagation modes. A dual-mode transition, based on a double microstrip input, allows to excite both propagation modes within the SIW, and it can be fed by a novel single layer dual-band phase shifter with a different shift at each frequency. A square patch is placed over each pair of slots to increase the coupled energy per element, resulting in a low polarization loss and high performance compact antenna at 3.5 GHz and 6 GHz for dual-band TX/RX systems at C-Band.

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A Hybrid Beamforming Design for Massive MIMO LEO Satellite Communications

Cited by 30 publications

References 11 publications

Joint Hybrid Beamforming and User Scheduling for Multi-Satellite Cooperative Networks

Joint Hybrid Beamforming and User Scheduling for Multi-Satellite Cooperative Networks

Location-assisted precoding in 5G LEO systems: architectures and performances

Enhanced substrate integrated waveguide slot arrays for radiofrequency worldwide coverage systems

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