Non-Coaxial OAM: Precoding Design, Misaligned Parameter Estimation and Capacity Compensation

Jian, Mengnan; Chen, Yijian; Yu, Guanlong

doi:10.1109/access.2021.3062946

“…In this paper, we focus on a UCA-based line-of-sight (LoS) OAM communication system as considered in [6]- [8], [11]- [13], [21], [22]. Since the transmit UCA and the receive UCA need to be aligned, beam steering approach is proposed to achieve beam alignment between the UCAs at both sides [7], [12].…”

Section: Uca-based Oam Communication Systemsmentioning

confidence: 99%

“…According to (21), the procedure the hybrid mechanical and electronic beam steering scheme can be designed as the four successive steps shown in Fig. 5.…”

Section: Hybrid Mechanical and Electronic Beam Steering Of Oam Commun...mentioning

confidence: 99%

“…1. Specifically, the coarse alignment is first achieved by mechanical beam steering, and then electronic beam steering is exploited to compensate the small-scale misalignment error caused by perturbations, such as random wind, rain, or installation errors [21]. The principle of electronic beam steering for UCA-based OAM communication system is compensating the changed phases caused by oblique angle at the transmit or receive UCA through adjusting the delays of antenna elements by phase shifters, then the normal phases used only for OAM piralization/despiralization are tuned to the new phases used for both OAM piralization/despiralization and beam steering towards the direction of departure/arrival of OAM beams [7].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hybrid Mechanical and Electronic Beam Steering for Maximizing OAM Channel Capacity

Chen

¹

,

Tian

²

,

Long

³

et al. 2023

IEEE Trans. Wireless Commun.

8

0

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Radio frequency-orbital angular momentum (RF-OAM) is a novel approach of multiplexing a set of orthogonal modes on the same frequency channel to achieve high spectrum efficiencies. Since OAM requires precise alignment of the transmit and the receive antennas, the electronic beam steering approach has been proposed for the uniform circular array (UCA)-based OAM communication system to circumvent large performance degradation induced by small antenna misalignment in practical environment. However, in the case of large-angle misalignment, the OAM channel capacity can not be effectively compensated only by the electronic beam steering. To solve this problem, we propose a hybrid mechanical and electronic beam steering scheme, in which mechanical rotating devices controlled by pulse width modulation (PWM) signals as the execution unit are utilized to eliminate the large misalignment angle, while electronic beam steering is in charge of the remaining small misalignment angle caused by perturbations. Furthermore, due to the interferometry, the receive signal-to-noise ratios (SNRs) are not uniform at the elements of the receive UCA. Therefore, a rotatable UCA structure is proposed for the OAM receiver to maximize the channel capacity, in which the simulated annealing algorithm is adopted to obtain the optimal rotation angle at first, then the servo system performs mechanical rotation, at last the electronic beam steering is adjusted accordingly. Both mathematical analysis and simulation results validate that the proposed hybrid mechanical and electronic beam steering scheme can effectively eliminate the effect of diverse misalignment errors of any practical OAM channel and maximize the OAM channel capacity.

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“…min (|γ| + |ψ|) in yaw and pitch directions Search for θ in roll direction. (21) This is the motivation of proposing hybrid mechanical and electronic beam steering. Mechanical beam steering enables the misalignment angles fall into the range of "small angle" and leave them for electronic beam steering, which happens when the receiver starts running or moves to another place.…”

Section: B Solution In Large-angle Misalignment Casementioning

confidence: 99%

Hybrid Mechanical and Electronic Beam Steering for Maximizing OAM Channel Capacity

Chen¹,

Tian²,

Long³

et al. 2022

Preprint

0

View full text Add to dashboard Cite

Radio frequency-orbital angular momentum (RF-OAM) is a novel approach of multiplexing a set of orthogonal modes on the same frequency channel to achieve high spectrum efficiencies. Since OAM requires precise alignment of the transmit and the receive antennas, the electronic beam steering approach has been proposed for the uniform circular array (UCA)-based OAM communication system to circumvent large performance degradation induced by small antenna misalignment in practical environment. However, in the case of large-angle misalignment, the OAM channel capacity can not be effectively compensated only by the electronic beam steering. To solve this problem, we propose a hybrid mechanical and electronic beam steering scheme, in which mechanical rotating devices controlled by pulse width modulation (PWM) signals as the execution unit are utilized to eliminate the large misalignment angle, while electronic beam steering is in charge of the remaining small misalignment angle caused by perturbations. Furthermore, due to the interferometry, the receive signal-to-noise ratios (SNRs) are not uniform at the elements of the receive UCA. Therefore, a rotatable UCA structure is proposed for the OAM receiver to maximize the channel capacity, in which the simulated annealing algorithm is adopted to obtain the optimal rotation angle at first, then the servo system performs mechanical rotation, at last the electronic beam steering is adjusted accordingly. Both mathematical analysis and simulation results validate that the proposed hybrid mechanical and electronic beam steering scheme can effectively eliminate the effect of diverse misalignment errors of any practical OAM channel and maximize the OAM channel capacity.

show abstract

“…1. Specifically, the coarse alignment is first achieved by mechanical beam steering, and then electronic beam steering is exploited to compensate the small-scale misalignment error caused by perturbations, such as random wind, rain, or installation errors [23]. The principle of electronic beam steering for UCA-based OAM communication system is compensating the changed phases caused by oblique angle at the transmit or receive UCA through adjusting the delays of antenna elements by phase shifters, then the normal phases used only for OAM piralization/despiralization are tuned to the new phases used for both OAM piralization/despiralization and beam steering towards the direction of departure/arrival of OAM beams [7].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Mechanical and Electronic Beam Steering for Maximizing OAM Channel Capacity

Chen¹,

Tian²,

Long³

et al. 2022

Preprint

0

View full text Add to dashboard Cite

Radio frequency-orbital angular momentum (RF-OAM) is a novel approach of multiplexing a set of orthogonal modes on the same frequency channel to achieve high spectrum efficiencies. Since OAM requires precise alignment of the transmit and the receive antennas, the electronic beam steering approach has been proposed for the uniform circular array (UCA)-based OAM communication system to circumvent large performance degradation induced by small antenna misalignment in practical environment. However, in the case of large-angle misalignment, the OAM channel capacity can not be effectively compensated only by the electronic beam steering. To solve this problem, we propose a hybrid mechanical and electronic beam steering scheme, in which mechanical rotating devices controlled by pulse width modulation (PWM) signals as the execution unit are utilized to eliminate the large misalignment angle, while electronic beam steering is in charge of the remaining small misalignment angle caused by perturbations. Furthermore, due to the interferometry, the receive signal-to-noise ratios (SNRs) are not uniform at the elements of the receive UCA. Therefore, a rotatable UCA structure is proposed for the OAM receiver to maximize the channel capacity, in which the simulated annealing algorithm is adopted to obtain the optimal rotation angle at first, then the servo system performs mechanical rotation, at last the electronic beam steering is adjusted accordingly. Both mathematical analysis and simulation results validate that the proposed hybrid mechanical and electronic beam steering scheme can effectively eliminate the effect of diverse misalignment errors of any practical OAM channel and maximize the OAM channel capacity.

show abstract

Non-Coaxial OAM: Precoding Design, Misaligned Parameter Estimation and Capacity Compensation

Cited by 13 publications

References 43 publications

Hybrid Mechanical and Electronic Beam Steering for Maximizing OAM Channel Capacity

Hybrid Mechanical and Electronic Beam Steering for Maximizing OAM Channel Capacity

Hybrid Mechanical and Electronic Beam Steering for Maximizing OAM Channel Capacity

Hybrid Mechanical and Electronic Beam Steering for Maximizing OAM Channel Capacity

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