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

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Document pages: 11 pages

Abstract: Future railway is expected to accommodate both train operation services andpassenger broadband services. The millimeter wave (mmWave) communication is apromising technology in providing multi-gigabit data rates to onboard users.However, mmWave communications suffer from severe propagation attenuation andvulnerability 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-stageHBF algorithm in blockage-free scenarios. In the first stage, the minimum meansquare error method is adopted for optimal hybrid beamformer design with lowcomplexity and fast convergence; in the second stage, the orthogonal matchingpursuit method is utilized to approximately recover the analog and digitalbeamformers. Second, in blocked scenarios, we design an anti-blockage scheme byadaptively invoking the proposed HBF algorithm, which can efficiently deal withrandom blockages. Extensive simulation results are presented to show the sumrate 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 theeffective rate by 20 in severely-blocked scenarios while maintaining lowoutage probability.

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