Dynamic mmWave beam tracking for high speed railway communications

Gao, Meilin; Ai, Bo; Niu, Yong; Zhang, Zhong; Liu, Yiru; Ma, Guoyu; Zhang, Zhewei; Li, Dapeng

doi:10.1109/wcncw.2018.8368998

Cited by 37 publications

(27 citation statements)

References 14 publications

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“…In terms of the THz MIMO system, the key point of beamforming technique is to design an optimal precoding matrix to maximize the beam gain of the array antennas [137]. Since the beamforming design is significantly dependent on the CSI acquisition [138,139], it is really important to obtain the accurate AoDs at the transmitter and the AoAs at the receiver to further realize the beam control techniques.…”

Section: Beam Controlmentioning

confidence: 99%

Towards intelligent reflecting surface empowered 6G terahertz communications: A survey

et al. 2021

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Terahertz (THz) communications have been widely envisioned as a promising enabler to provide adequate bandwidth and achieve ultra-high data rates for sixth generation (6G) wireless networks. In order to mitigate blockage vulnerability caused by serious propagation attenuation and poor diffraction of THz waves, an intelligent reflecting surface (IRS), which manipulates the propagation of incident electromagnetic waves in a programmable manner by adjusting the phase shifts of passive reflecting elements, is proposed to create smart radio environments, improve spectrum efficiency and enhance coverage capability. Firstly, some prospective application scenarios driven by the IRS empowered THz communications are introduced, including wireless mobile communications, secure communications, unmanned aerial vehicle (UAV) scenario, mobile edge computing (MEC) scenario and THz localization scenario. Then, we discuss the enabling technologies employed by the IRS empowered THz system, involving hardware design, channel estimation, capacity optimization, beam control, resource allocation and robustness design. Moreover, the arising challenges and open problems encountered in the future IRS empowered THz communications are also highlighted. Concretely, these emerging problems possibly originate from channel modeling, new material exploration, experimental IRS testbeds and intensive deployment. Ultimately, the combination of THz communications and IRS is capable of accelerating the

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Section: Beam Controlmentioning

confidence: 99%

Towards intelligent reflecting surface empowered 6G terahertz communications: A survey

et al. 2021

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“…So the wireless channel in HSR scenarios has obvious non-stationary and fast time-varying characteristics, which seriously reduces the performance of train-ground communication systems [2]. Moreover, due to the complexity and non-stationarity of HSR scenarios, there are weak field strength areas and blind areas, and the train body of metal material causes great penetration loss to the signal from the BS [3]. Therefore, meeting passengers' compelling demand for broadband mobile communications in the HSR environment has become a key technical challenge.…”

Section: Introductionmentioning

confidence: 99%

“…To utilize mm-wave communications for train-ground communications, high-speed data transmission can be realized with the help of mobile relays (MRs) deployed on the rooftop of the train, which can significantly improve the broadband wireless communication service performance of the entire train-ground communication system [3]. Furthermore, the fullduplex (FD) communication technology allows wireless communication devices to simultaneously transmit and receive signals on the same frequency band, and the capacity of the communication system can be doubled theoretically [6].…”

Section: Introductionmentioning

confidence: 99%

Resource Allocation for Millimeter-Wave Train-Ground Communications in High-Speed Railway Scenarios

Zhang

Niu

Mao

et al. 2021

Preprint

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With the development of wireless communication, higher requirements arise for train-ground wireless communications in high-speed railway (HSR) scenarios. The millimeter-wave (mm-wave) frequency band with rich spectrum resources can provide users in HSR scenarios with high performance broadband multimedia services, while the full-duplex (FD) technology has become mature. In this paper, we study train-ground communication system performance in HSR scenarios with mobile relays (MRs) mounted on rooftop of train and operating in the FD mode. We formulate a nonlinear programming problem to maximize network capacity by allocation of spectrum resources. Then, we develop a sequential quadratic programming (SQP) algorithm based on the Lagrange function to solve the bandwidth allocation optimization problem for track-side base station (BS) and MRs in this mm-wave train-ground communication system. Extensive simulation results demonstrate that the proposed SQP algorithm can effectively achieve high network capacity for trainground communication in HSR scenarios while being robust to the residual self-interference (SI).

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“…However, this method is performed periodically for successive adjacent moving regions of interest, which increases the complexity of the system. A dynamic mmWave beam tracking by jointly adjusting the beam direction and beamwidth is researched in [19]. This scheme converts the problem into non-convex, which can achieve near-optimal throughput performance, but it brings beam adjustment overhead.…”

Section: Introductionmentioning

confidence: 99%

Low-Complexity Beam Selection Scheme for High Speed Railway Communications

Jiang

Zhao

et al. 2020

IEEE Access

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Large-scale multiple input multiple output (MIMO) assisted beamforming based on millimeter waves is an effective way to increase system capacity and data transmission rate for high speed railway (HSR) communication systems. To reduce the number of handovers and improve system throughput, multi-stream beamforming with different beamwidths is used as the transmit beam at the base station (BS). However, when the train moves toward the cell edge, the inter-beam ambiguity (IBA) between multiple beams becomes more and more serious, and the performance of the system will decrease significantly if multiple beams are still activated simultaneously. In order to overcome such difficulty, a low-complexity beam selection scheme based on multi-stream beamforming is proposed in this paper. With this methodology, when the train is in the vicinity of the BS, all beams are activated to achieve the performance of high throughput. Neverthless, when the train moves at the cell edge, only one beam is activated due to the insupportable IBA. The optimal beam switching position could be calculated according to the requirements of the angular resolution. Observing from the theoretical analysis and the simulation results, the proposed scheme can achieve low complementation complexity with high throughput performance. INDEX TERMS High speed railway, large-scale MIMO, millimeter wave, multi-stream beamforming, beam selection.

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Dynamic mmWave beam tracking for high speed railway communications

Cited by 37 publications

References 14 publications

Towards intelligent reflecting surface empowered 6G terahertz communications: A survey

Towards intelligent reflecting surface empowered 6G terahertz communications: A survey

Resource Allocation for Millimeter-Wave Train-Ground Communications in High-Speed Railway Scenarios

Low-Complexity Beam Selection Scheme for High Speed Railway Communications

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