Joint OAM Multiplexing and OFDM in Sparse Multipath Environments

Liang, Liping; Cheng, Wenchi; Zhang, Wei; Zhang, Hailin

doi:10.1109/tvt.2020.2966787

Cited by 52 publications

(29 citation statements)

References 33 publications

(25 reference statements)

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“…Moreover, the novel multiplexing and coding of orbital angular momentum (OAM) waves provide a new degree of freedom to realize ultra-high capacity communication [114]. The channel model of an OAM beam at 70 GHz was presented in [115], while an OAM multipath channel model based on uniform circle array in the mmWave band was reported in [116]. Despite the increasing attentions on using the OAM technique in the THz band [117,118], the research on THz OAM is still underdeveloped due to the huge challenges in the generation and detection of THz vortex beam.…”

Section: Other Channel Modelsmentioning

confidence: 99%

THz channel modeling: Consolidating the road to THz communications

Liu

Guo

et al. 2021

China Commun.

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For the sake of meeting the demand of data rates at terabit (Tbit) per second scale in future networks, the terahertz (THz) band is widely accepted as one of the potential key enabling technologies for next generation wireless communication systems. With the progressive development of THz devices, regrading THz communications at system level is increasing crucial and captured the interest of plenty of researchers. Within this scope, THz channel modeling serves as an indispensable and fundamental element. By surveying the latest literature findings, this paper reviews the problem of channel modeling in the THz band, with an emphasis on molecular absorption loss, misalignment fading and multipath fading, which are major influence factors in the THz channel modeling. Then, we focus on simulators and experiments in the THz band, after which we give a brief introduction on applications of THz channel models with respects to capacity, security, and sensing as examples. Finally, we discuss some key issues in the future THz channel modeling.

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Section: Other Channel Modelsmentioning

confidence: 99%

THz channel modeling: Consolidating the road to THz communications

Liu

Guo

et al. 2021

China Commun.

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“…Similarly, they assumed that the OAM-based wireless channel model in sparse multipath environments was known and that there was no inter-mode interference caused by reflection paths. On the basis of previous research, Liang et al built an OAM-based wireless channel model in a sparse multipath environment including a LOS path and several reflection paths, which obtained high capacity while resisting multipath interference [83].…”

Section: Combination Of Oam and New Technologiesmentioning

confidence: 99%

Research Status and Prospects of Orbital Angular Momentum Technology in Wireless Communication

Zheng¹,

Chen²,

Ji³

et al. 2020

PIER

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It becomes more and more challenging to satisfy the long-term demand of transmission capacity in wireless networks if we limit our research within the frame of traditional electromagnetic wave characteristics (e.g., frequency, amplitude, phase and polarization). The potential of orbital angular momentum (OAM) for unleashing new capacity in the severely congested spectrum of commercial communication systems is generating great interest in wireless communication field. The OAM vortex wave/beam has different topological charges, which are orthogonal to each other. It provides a new way for multiplexing in wireless communications. Electromagnetic wave or synthetic beam carrying OAM has a spiral wavefront phase structure, which may provide a new degree of freedom or better orthogonality in spatial domain. In this paper, we introduce the fundamental theory of OAM. Then, OAM generation and reception methods are equally demonstrated. Furthermore, we present the latest development of OAM in wireless communication. We further discuss the controversial topic "whether OAM provides a new degree of freedom" and illustrate our views on the relationship between OAM and MIMO. Finally, we suggest some open research directions of OAM.

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“…Fortunately, we have noticed that the anti-multipath property of orthogonal frequency division multiplexing (OFDM) technique can be utilized to mitigate the inter-symbol interference or the channel crosstalk for broadband wireless communications. The compatibility between OAM and the traditional OFDM has been proven, which can achieve extremely high capacity in OAM communications [18][19][20][21]. The experimental investigation has been presented to indicate the inter-symbol interference caused by multipath effects for OAM channel using OFDM, and the results have demonstrated that an channel with high order OAM-modes tends to suffer from stronger intra-and inter-channel crosstalk [18].…”

Section: Introductionmentioning

confidence: 99%

“…Considering the overhead in hardware and the computational complexity in software, the researchers of [20] proposed a time-switched OFDM-OAM MIMO system by performing a time-switched sequence in the baseband, and analyzed spectrum efficiency for LoS OAM wireless transmissions. The authors have proposed the joint OAM multiplexing and the traditional OFDM scheme in sparse multipath environments, and demonstrated that the phase difference compensation can drastically increase channel capacity [21].…”

Section: Introductionmentioning

confidence: 99%

Optimal Power Allocation Algorithm for Multi-Mode OFDM-OAM Communication Systems in Multipath Channel

Wang

Liao

et al. 2020

IEEE Access

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Vortex wave carrying orbital angular momentum (OAM), an important property of electromagnetic wave, has bridged a new way to achieve high-capacity radio-frequency communications using different OAM-modes. However, the system performance of OAM multiplexing with orthogonalfrequency-division multiplexing (OFDM) technologies has not been thoroughly investigated in multipath channel environment. In this paper, we first built up the uniform circular array (UCA)-based multi-mode OFDM-OAM communication system, where the reflected paths has been generated based on ideal specular reflector. Based on the multi-mode OFDM-OAM communication system model, we also derived the twopath OAM channel model with the direct and reflected paths. Then, we proposed a robust optimal power allocation algorithm by decomposing the whole optimization problem into inner-layer OAM-modes optimization and outer-layer OFDM subcarriers optimization in order to control the allocated power flexibly based on the channel quality differences between OAM-modes. The simulation results demonstrate that the proposed algorithm can significantly increase the channel capacity for multi-mode OFDM-OAM communications in multipath channel as compared with the traditional equal power allocation method and has a considerable low computational complexity than the binary search water-filling method when the number of OFDM subcarriers is large enough. INDEX TERMS Orbital angular momentum (OAM), orthogonal frequency-division multiplexing-orbital angular momentum (OFDM-OAM), power allocation, spectrum efficiency, multipath transmission channel

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Joint OAM Multiplexing and OFDM in Sparse Multipath Environments

Cited by 52 publications

References 33 publications

THz channel modeling: Consolidating the road to THz communications

THz channel modeling: Consolidating the road to THz communications

Research Status and Prospects of Orbital Angular Momentum Technology in Wireless Communication

Optimal Power Allocation Algorithm for Multi-Mode OFDM-OAM Communication Systems in Multipath Channel

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