Doppler frequency offsets estimation and diversity reception scheme of high speed railway with multiple antennas on separated carriages

This paper presents results for delay and Doppler spread characterization in high-speed railway (HSR) hilly scenario. To investigate the propagation characteristics in this specific terrain, a measurement campaign is conducted along the “Guangzhou-Shenzhen” HSR in China. A wideband channel sounder with 40 MHz bandwidth is used to collect raw data at 2.4 GHz band. The delay spread and Doppler frequency features are analyzed based on measured data. It is found that there are abundant multipath components (MPCs) in this scenario. We present the relationship between the delay spreads and the transceiver distances. The measured route can be divided into four areas with different delay and Doppler characteristics. Finally, a tapped delay line (TDL) model is proposed to parameterize the channel responses in the HSR hilly environment, which is supposed to provide criterions for evaluations of the radio interface and development of wireless communication system.

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ICI Mitigation by Estimation of Double Carrier Frequency Offsets in High-Speed-Railway Communication Systems for Smart Cities

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering - Industrial Networks and Intelligent Systems ◽

10.1007/978-3-319-74176-5_7 ◽

2018 ◽

pp. 67-78

Author(s):

Yem Van Vu ◽

Thi Huong Trinh ◽

Nhat Minh Vu ◽

Canh Minh Nguyen ◽

Duy Viet Nguyen

Keyword(s):

Carrier Frequency ◽

Communication Systems ◽

High Speed ◽

Smart Cities ◽

High Speed Railway ◽

Carrier Frequency Offsets ◽

Frequency Offsets

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Fast Telemetry and Communication Scheme Based on Doppler Diversity Reception under Large Dynamic Doppler for Hypersonic Vehicles

Electronics ◽

10.3390/electronics8070781 ◽

2019 ◽

Vol 8 (7) ◽

pp. 781 ◽

Cited By ~ 1

Author(s):

Lei Shi ◽

Lei Zhao ◽

Chao Zhang ◽

Bo Yao

Keyword(s):

High Speed ◽

Doppler Frequency ◽

Frequency Offset ◽

Rate Of Change ◽

Hypersonic Vehicles ◽

Diversity Reception ◽

Communication Signals ◽

Doppler Diversity ◽

Communication Time ◽

Tracking Module

Large dynamic Doppler caused by high-speed flight of hypersonic vehicles brings a great challenge to acquisition, tracking and correct demodulation of telemetry and communication signals. Different from receiving schemes of existing telemetry and communications, a novel communication method based on Doppler diversity reception for hypersonic vehicles was proposed in this study. Firstly, the proposed method offers a coarse acquisition of Doppler frequency offset and its rate-of-change by fast-coarse acquisition method, and then decreases the large Doppler frequency offset into a certain range through compensation. Finally, signals with residual Doppler frequency offset are processed directly by Doppler diversity reception method without a complicated tracing method. Different from the traditional receiving scheme with acquisition and tracking module, the proposed scheme lowers requirements on acquisition accuracy and neglects the accurate tracking module, thus shortening telemetry and communication time significantly for hypersonic vehicles. Simulation results demonstrate that the proposed method can achieve satisfactory performance when the residual Doppler is no higher than 1 kHz with normalized Doppler frequency offset and when the normalized artificial frequency shift is 0.01 and 0.4 respectively.

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Cooperative Access Architecture for High Speed Railway

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.403-408.2839 ◽

2011 ◽

Vol 403-408 ◽

pp. 2839-2842 ◽

Cited By ~ 1

Author(s):

Fang Dong ◽

Jun Biao Liu ◽

Xiao Hui Hu

Keyword(s):

Frequency Shift ◽

High Speed ◽

High Mobility ◽

Network Connectivity ◽

Doppler Frequency ◽

Doppler Frequency Shift ◽

Broadband Communication ◽

High Speed Railway ◽

Fast Handoff ◽

Definition Of

With the great demand for broadband communication in high speed railway, new access technologies should be adapted to high mobility which brings Doppler frequency shift and fast handoff. The definition of cooperative range is presented and its influence on network connectivity is studied. The result shows that cooperation can greatly extend a wireless user’s communication range. A novel scheme of cooperative access architecture is proposed to support high-speed users with broadband communication.

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