LI Zhen, ZHU Xiang, JI Wenli, ZHENG Guoxin. The Real-Time Simulation of Doppler Spread in Wireless Mobile Environment by RF Circuits[J]. Chinese Journal of Electronics, 2015, 24(4): 837-843. doi: 10.1049/cje.2015.10.029
Citation: LI Zhen, ZHU Xiang, JI Wenli, ZHENG Guoxin. The Real-Time Simulation of Doppler Spread in Wireless Mobile Environment by RF Circuits[J]. Chinese Journal of Electronics, 2015, 24(4): 837-843. doi: 10.1049/cje.2015.10.029

The Real-Time Simulation of Doppler Spread in Wireless Mobile Environment by RF Circuits

doi: 10.1049/cje.2015.10.029
Funds:  This work is supported by the National Natural Science Foundation of China (No.61132003, No.61171086) and LAB Opening project (No.SKLSFO2014-01).
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  • Corresponding author: ZHENG Guoxin (correspondingauthor) was born in Shanxi. He receivedthe B.E. from Taiyuan University of Technology,China, in 1982 and M.E. fromShanxi Mining Institute, China, in 1987.He currently serves as Senior Fellow ofInstitution of Engineering and Technology(IET) and Vice Committee Chair ofthe Microwave Division of Shanghai Instituteof Electronics. His research interestsinclude channel modeling and measurement, implementationand testing of vehicular wireless communications. He has authored/coauthored a number of publications in international journalsand IEEE/IET conferences. He is now the Lead Scientist andthe Principal Engineer for the Shanghai Key Project of Communicationbased Train Control in Metro. He also serves as the Chair forShanghai University-China National Railway Signal Testing Centerand Joint Lab for Wireless Communication in Metro.(Email:gxzheng@staff.shu.edu.cn)
  • Received Date: 2014-06-24
  • Rev Recd Date: 2015-03-13
  • Publish Date: 2015-10-10
  • The time-varying characteristic of wireless channel under the high-speed mobile environments in tunnels causes the Doppler spread to the transmitted signals, which affects the performance of wireless communication systems. The real-time Doppler effect simulation methodology directly based on Radio frequency (RF) circuits is proposed to simulate different Doppler spread effects in real environments. Mixers and a Digital-to-analog (DA) converter circuit are utilized to spread the spectrum of RF signals. A PC platform with the interface written in C# is configured to control the spectrum spread parameters. This radio channel emulator with the proposed methodology can replace the expensive fading simulating instruments with only 25.1ns system delay. Such an emulator has been applied to test the Multi-carrier wireless information local loop (McWiLL) wireless vehicle communication system in the laboratory to meet the requirement of metro Communication based train control (CBTC) system.
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