Enhancing Transmission on Hybrid Precoding Based Train-to-Train Communication
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Enhancing Transmission on Hybrid Precoding Based Train-to-Train Communication Junhui Zhao1,2
· Jin Liu1 · Shanjin Ni1 · Yi Gong3
© Springer Science+Business Media, LLC, part of Springer Nature 2019
Abstract Train-to-Train (T2T) communication is expected to increase efficiency of train operation and reduce life cycle cost in construction for urban rail transit system. In this paper, we introduce the millimeter wave (mmWave) and multiple input multiple output (MIMO) technologies to improve the reliability and capacity of T2T communication, and a novel mmWave MIMO based transmission scheme is proposed. By applying the hybrid precoding at the T2T transceivers, the system design cost and power consumption are greatly reduced, while satisfying the requirements of spectral efficiency and signal to noise ratio (SNR). Simulations results show that the performance of the proposed precoder approaches the one under unconstrained digital precoder. Compared with the analog precoding scheme, the proposed scheme can achieve at least a 7-fold increase in spectral efficiency. By analyzing the effects of the number of data streams, the number of radio frequency (RF) chains, and the T2T communication distance on the system performance, the proposed scheme is confirmed to provide theoretical guidance for practical design of T2T communication. Keywords Hybrid precoding · Millimeter wave (mmWave) · Multiple input multiple output (MIMO) · Train to train (T2T) communication · Urban rail transit
1 Introduction The increasing development of the train control system (TCS) has motivated extensive research in driving safety and operational efficiency of urban rail transit system [1]. As one of the most widely used TCS, communicationbased train control (CBTC) system performs better on time interval between two neighboring trains. In such system, continuous bidirectional train-to-ground (T2G) communications are applied to transmit status and control information of trains, which has the capability to realize the autonomous operation functions in high-density areas. Nevertheless, based on the T2G structure, the CBTC
Junhui Zhao
[email protected] 1
School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing, China
2
School of Information Engineering, East China Jiaotong University, Nanchang, China
3
Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, China
system requires a ground central management to control the movement authority (MA) of the train, while the failure of a single device will heavily degrade the entire system performance [2]. Although the existing communication mechanisms can effectively support the two-way real-time information interaction between the train and the ground, it still exists some technical challenges arising from complicated interference, unsupported high-speed communication, and multi-service integration. Besides, the wireless communication system of CBTC, passenger information system (PIS), and closed circuit tele
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