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Adaptive hierarchical modulation is an effective technique to improve the spectral efficiency for multi-service transmission in high-speed railway (HSR) communication systems. Many efforts have been devoted to studying this technique with the perfect channel state information (CSI) assumption. However, the fast time-varying fading channels and feedback delay lead that the perfect CSI cannot be obtained...
A field channel measurement is carried out in highspeed railways (HSRs) along the “Luoyang South-Lintong East” line of China, and the finite-state Markov channel (FSMC) modeling is exploited to characterize the small-scale fading channels. The large-scale path loss can be predicted relatively precisely since the line-of-sight (LOS) propagation component dominates the wireless channel in HSR, while...
A high performance wireless network is essential for for the railway communication and control systems. Research on the fading characteristics in railway environment is of great importance for the design of the railway wireless network. In this paper, measurements are taken in railway terrain cuttings area using track side base stations of the GSM-R network. The fitted path loss model, shadow fading,...
Relay is considered as an effective method to improve the coverage of high data rates, group mobility, temporary network deployment, and cell-edge throughput and provide the coverage in new areas. Mobile relay station (MRS) is considered as an extension of fixed relay in mobile scenarios such as bus, car and train. Doppler diversity is a diversity technique to improve reliability in highspeed scenario,...
A network with high quality of service (QoS) is required for railway wireless communication and control systems. Research on radio-wave propagation in railway environment has great significance for the design and optimization of the railway wireless network. In this paper, measurements are taken in railway viaduct area using track side base stations of the GSM-R network. Comparison between the measured...
In order to ensure the safety of the running train, wireless communication system for train communications and control must provide a network with high quality of service (QoS). And wireless network design will directly influence the performance of the whole network. In the process of the network design, choosing the appropriate prediction model, predicting the coverage, and determining base station...
The estimation of local mean signal power in wireless field strength coverage is of utmost importance in the planning of base stations in wireless mobile cellular communications systems. Many related topics about the estimation of local mean signal strength are based on Lee's law, which has some restrictions in the real implementation. While, in the construction of our native railway, a 4 cm sampling...
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