Position-Based Limited Feedback Scheme for Railway MU-MIMO Systems

Li, Yan; Fang, Xuming; Wang, Cheng-Xiang

doi:10.1109/tvt.2015.2511021

Cited by 18 publications

(8 citation statements)

References 25 publications

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“…and it should be noticed that the f 12 function in (10) and the f 21 function in (9) are the same due to the channel reciprocity between the two vehicles. Using these three bandwidth requirement values just derived, respectively, in three different modes, we define spectrum gain (SG) and oriented spectrum gain (SG 12 and SG 21 ) of a D2D-relay pair which is calculated by…”

Section: Spectrum Efficient D2d-relay Pairingmentioning

confidence: 99%

“…Nevertheless, one intrinsic problem of resource allocation in vehicular communications has to be mentioned is that the instantaneous channel state information (CSI) is hard to harness due to the high mobility and fast fading characteristics of the motive wireless channel. Many related types of research made a compromise and considered only the location-specific long-range shadowing [7][8][9]. And that problem may also contribute to why cooperative communication is less studied in vehicular scenarios since the cooperation patterns are always highly CSI sensitive.…”

Section: Introductionmentioning

confidence: 99%

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Iterative greedy user clustering algorithm for D2D–relay in vehicular communication systems

Wang

Zhou

et al. 2019

IET Microwaves, Antennas & Propagation

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Device‐to‐device (D2D) communications help in improving the performance of wireless services in cellular networks via enabling cooperation among mobile users. Further, compared to traditional pairwise cooperation, cluster‐wise cooperation can achieve even higher spectral and power efficiency. D2D clustering certainly can be a great supporting technology for the future of intelligent transportation. In this study, the authors investigate the D2D–relay clustering network in the vehicular scenario and propose a new clustering scheme named iterative greedy user clustering (IGUC). By exploiting those vehicles with better channel state, system resources can be saved. Here, they mainly focus on the question which is by applying D2D–relay clustering among vehicles, how much bandwidth could be saved in the uplink. This problem is mathematically formulated into a non‐linear binary programming problem with the goal being minimum spectrum usage. Due to the NP‐hardness, the low‐complexity suboptimal algorithm IGUC is introduced to tackle it. Simulation results show that compared to the non‐cooperative uplink system, IGUC saves a considerable proportion of the spectrum. Furthermore, clusters in denser and further areas tend to produce a higher gain. Influence of the fast time‐varying characteristic of vehicular wireless channels is also investigated, upon which an adaptive switch mechanism is proposed to further facilitate IGUC.

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Section: Spectrum Efficient D2d-relay Pairingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Iterative greedy user clustering algorithm for D2D–relay in vehicular communication systems

Wang

Zhou

et al. 2019

IET Microwaves, Antennas & Propagation

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“…Given the equivalence of P2 and P3, the optimal RX combiner w * m given by (13) also satisfies P3. Update RX beamformer w m * by (13) 3:…”

Section: A First Stage: Mmse-based Transceiver Beamformingmentioning

confidence: 99%

“…where σ 2 m is noise power. Note that, the Doppler effect raised due to the high-mobility can be effectively tracked and compensated, based on the high-accuracy location information and regular movements of high-speed train [13].…”

Section: Channel Modelmentioning

confidence: 99%

Efficient Hybrid Beamforming With Anti-Blockage Design for High-Speed Railway Communications

Gao¹,

Ai²,

Niu³

et al. 2020

IEEE Trans. Veh. Technol.

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Future railway is expected to accommodate both train operation services and passenger broadband services. The millimeter wave (mmWave) communication is a promising technology in providing multi-gigabit data rates to onboard users. However, mmWave communications suffer from severe propagation attenuation and vulnerability to blockage, which can be very challenging in high-speed railway (HSR) scenarios. In this paper, we investigate efficient hybrid beamforming (HBF) design for train-to-ground communications. First, we develop a two-stage HBF algorithm in blockage-free scenarios. In the first stage, the minimum mean square error method is adopted for optimal hybrid beamformer design with low complexity and fast convergence; in the second stage, the orthogonal matching pursuit method is utilized to approximately recover the analog and digital beamformers. Second, in blocked scenarios, we design an anti-blockage scheme by adaptively invoking the proposed HBF algorithm, which can efficiently deal with random blockages. Extensive simulation results are presented to show the sum rate performance of the proposed algorithms under various configurations, including transmission power, velocity of the train, blockage probability, etc. It is demonstrated that the proposed anti-blockage algorithm can improve the effective rate by 20% in severely-blocked scenarios while maintaining low outage probability. Index Terms-High-speed railway, mmWave communications, hybrid beamforming, low complexity, anti-blockage. I. INTRODUCTION We have witnessed the rapid expansion of high-speed railway (HSR) transportation in the past decade, where railway communications are evolving at a fast pace to provide wireless broadband connections between roadside infrastructures and onboard travellers [2]. Innovation campaigns have been launched by railway operators, and the concept of "smart rail" is put forward by Shift2Rail [3]. Smart rail services are envisioned to deliver consistent quality experiences, supporting a variety of services including autonomous driving, train multimedia M. Gao, B. Ai, and Y. Niu are with the

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“…How to use the position information to enhance the HSR communication performance has become a research trend. However, only a limited number of studies have considered the train position information to facilitate the system design, such as position-based channel modeling [14], position-assisted handover scheme [91], position-based limited feedback scheme [113], and location information-assisted opportunistic beamforming [114]. In HSR scenarios, the channel condition mainly depends on the signal transmission distance, which results in the different channel conditions along the rail.…”

Section: A Location-aware Rrmmentioning

confidence: 99%

A survey on high-speed railway communications: A radio resource management perspective

Zhu

et al. 2016

Computer Communications

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High-speed railway (HSR) communications will become a key feature supported by intelligent transportation communication systems. The increasing demand for HSR communications leads to significant attention on the study of radio resource management (RRM), which enables efficient resource utilization and improved system performance.RRM design is a challenging problem due to heterogenous quality of service (QoS) requirements and dynamic characteristics of HSR wireless communications. The objective of this paper is to provide an overview on the key issues that arise in the RRM design for HSR wireless communications. A detailed description of HSR communication systems is first presented, followed by an introduction on HSR channel models and characteristics, which are vital to the cross-layer RRM design. Then we provide a literature survey on state-of-the-art RRM schemes for HSR wireless communications, with an in-depth discussion on various RRM aspects including admission control, mobility management, power control and resource allocation. Finally, this paper outlines the current challenges and open issues in the area of RRM design for HSR wireless communications.

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Position-Based Limited Feedback Scheme for Railway MU-MIMO Systems

Cited by 18 publications

References 25 publications

Iterative greedy user clustering algorithm for D2D–relay in vehicular communication systems

Iterative greedy user clustering algorithm for D2D–relay in vehicular communication systems

Efficient Hybrid Beamforming With Anti-Blockage Design for High-Speed Railway Communications

A survey on high-speed railway communications: A radio resource management perspective

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