Modeling and Optimization of OAM-MIMO Communication Systems With Unaligned Antennas

Xiong, Xusheng; Lou, Hanqiong; Ge, Xiaohu

doi:10.1109/tcomm.2022.3166541

Cited by 9 publications

(2 citation statements)

References 50 publications

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“…spectral efficiency and channel capacity [1][2][3][4][5][6][7][8], achieved by the good orthogonality between different OAM modes [9,10]. Extensive mechanism analyses and experimental designs have been used to verify the feasibility of wireless OAM communication [11], arrival angle estimation [12], beam detection [13], multi-target control [14], etc. from microwave bands to the terahertz and optical bands.…”

Section: Introductionmentioning

confidence: 99%

Gain and mode purity filtering dual polarized OAM beam generation using cavity waveguide-based 3D transmitarray

Cao,

Zhang,

Yang

et al. 2024

J. Phys. D: Appl. Phys.

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A 3D transmitarray (TA) is proposed to generate dual-polarized orbital angular momentum (OAM) beams with gain and mode purity filtering responses. The TA units are realized by square cavity filters with the same passband and different orders and inner widths, resulting in different coupling cavity numbers. The evanescent modes in the coupling cavities will greatly decrease the propagation constant, thus generating a large phase variation. The square structure of the cavity filter makes it able to support dual-polarized wave propagation with the same phase delay and insert loss. Based on these transmission characteristics, eight different TA units are designed to realize a 3-bit phase gradient within the passband of 25.4 GHz to 26.7 GHz. It should be emphasized that the dispersed transmission phase and magnitude of the eight TA units in the stopbands will deteriorate the purity of the OAM beam. Therefore, the gain and mode purity filtering responses can be realized simultaneously. In order to verify the performance of the proposed OAM TA design, a TA prototype with the mode number l = -1 is fabricated by 3D printing technology. The TA can realize the maximum gain of 25.9 dB in the passband, and the rejection level is below –15.0 dB within the main beam direction. The purities of dual-polarized OAM beams are over 0.5 in the passband, and the cross-polarization is below –16.5 dB. The advantages of the OAM TA, including gain-filtering and mode purity-filtering responses, dual-polarization, and high efficiency make it a promising solution for millimeter-wave OAM sensing and communication applications.

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Section: Introductionmentioning

confidence: 99%

Gain and mode purity filtering dual polarized OAM beam generation using cavity waveguide-based 3D transmitarray

Cao,

Zhang,

Yang

et al. 2024

J. Phys. D: Appl. Phys.

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“…The other challenge for air-to-ground OAM communications is the antenna misalignment, which seriously limits the application of the OAM mode multiplexing. If the transmitting and receiving antennas are not aligned, it is difficult to decode the vortex wave signals with different OAM modes [16]. Due to the random distribution of users in hotspot region, the proposed cooperative OAM communication scheme in [17] still has the antenna misalignment scenario, thus requiring beam steering for performance compensation of OAM communications.…”

Section: Introductionmentioning

confidence: 99%

Air-to-Ground Cooperative OAM Communications

Chen,

Ding,

Zhang

et al. 2024

IEEE Wireless Commun. Lett.

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For users in hotspot region, orbital angular momentum (OAM) can realize multifold increase of spectrum efficiency (SE), and the flying base station (FBS) can rapidly support the real-time communication demand. However, the hollow divergence and alignment requirement impose crucial challenges for users to achieve air-to-ground OAM communications, where there exists the line-of-sight path. Therefore, we propose the airto-ground cooperative OAM communication (ACOC) scheme, which can realize OAM communications for users with sizelimited devices. The waist radius is adjusted to guarantee the maximum intensity at the cooperative users (CUs). We derive the closed-form expression of the optimal FBS position, which satisfies the antenna alignment for two cooperative user groups (CUGs). Furthermore, the selection constraint is given to choose two CUGs composed of four CUs. Simulation results are provided to validate the optimal FBS position and the SE superiority of the proposed ACOC scheme.

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Metaheuristic Algorithms for 6G wireless communications: Recent advances and applications

Abasi,

Aloqaily,

Guizani

et al. 2024

Ad Hoc Networks

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Modeling and Optimization of OAM-MIMO Communication Systems With Unaligned Antennas

Cited by 9 publications

References 50 publications

Gain and mode purity filtering dual polarized OAM beam generation using cavity waveguide-based 3D transmitarray

Gain and mode purity filtering dual polarized OAM beam generation using cavity waveguide-based 3D transmitarray

Air-to-Ground Cooperative OAM Communications

Metaheuristic Algorithms for 6G wireless communications: Recent advances and applications

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