Abstract
With the increasingly demand for reliable mobile communication service in the high-speed railway (HSR) system, the service stability of HSR communication is of great concern in recent research. Focusing on ensuring the quality of services (QoS) and system throughput, massive multi-input multi-output (massive MIMO) and beamforming technologies have been widely applied. In this paper, aiming to minimize the communication outage probability (OP) and not to decrease spectrum efficiency (SE) too much, we propose a fast HBF (F-HBF) scheme for HSR communications. The proposed scheme uses a low-complexity beam-searching algorithm to trace high-speed trains in real time. The simulation results verify that the proposed scheme can significantly reduce OP without too much SE degradation.
Highlights
With the rapid development of high-speed railway (HSR), an increasing number of people prefer to travel by this ground vehicle
Aiming to overcome the high outage probability (OP) brought by beam misalignment during the high-speed movement, we proposed a fast hybrid beamforming (HBF) (F-HBF) scheme to deal with the beam misalignment problem in HSR scenario
The simulation results are presented to demonstrate the performance of the proposed F-HBF scheme for MU-MIMO systems
Summary
With the rapid development of high-speed railway (HSR), an increasing number of people prefer to travel by this ground vehicle. The reliability and real-time performance of the data transmission cannot be guaranteed in the HSR scenario when using traditional communication technology. Considering the realization complexity, the codebook-based low-cost beam-searching algorithm for mmWave seems to be more acceptable to ensure the QoS in HSR scenario. This algorithm can be used at beam switching within BS and can achieve a close performance to the optimal single value decomposition (SVD) scheme This algorithm relies on the prior knowledge of train position and needs extra cost to deal with velocity feedback. Aiming to overcome the high OP brought by beam misalignment during the high-speed movement, we proposed a F-HBF scheme to deal with the beam misalignment problem in HSR scenario.
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