The dynamic evolution of multipath components in High-Speed Railway in viaduct scenarios: From the birth-death process point of view

Abstract

Based on the realistic channel measurement on High-Speed Railway (HSR) in viaduct scenarios at 2.35 GHz, the dynamic evolution of multipath components is investigated from the birth-death process point of view. Due to the distinction in the amount of resolvable multipath signals, the channel is divided into five segments and can be completely parameterized by several sets of statistical parameters associated with the type of environment and scenario. Then the four-state Markov chain, describing the birth-death number variation of the detected propagation waves, is employed to specialize the temporal stochastic properties. Furthermore, the steady probabilities and transition probabilities are provided which will facilitate the development and evaluation of wireless communication systems under HSR.

Channel Measurements and Models for High-Speed Train Communication Systems: A Survey

“…HST channel models in the literature can be categorized as large-scale fading models [35], [44], [45], [52], [56]- [58], [62], [65], [69], [70], [73], [75], i.e., PL and shadowing, and small scale-fading models [17], [34], [35], [95], [96], [98], [99], [101]- [105], [109]- [111]. The state-of-the-art of HST channel models has not been investigated yet.…”

“…The properties of radio channels in the carriages resemble indoor environment and hence they can be modeled using existing indoor channel models [44]. Therefore, [34], [35], [103]- [105], [111] have focused on modeling the outdoor HST scenarios have been presented in details earlier in this paper in Section II. While most of these scenarios can only be encountered in railway environments, open space scenario is similar to the rural or urban scenarios that can be found in conventional V2I or V2V communication systems.…”

“…Therefore, most of the current HST channel models, developed from V2I and V2V channel models by taking into account the effect of the high velocity of the Rx on the channel parameters, have been proposed for open space scenario [17], [34], [35], [95], [96], [102]- [105], [109]. Channel models for tunnel, cutting, and viaduct scenarios were studied in [99], [101], and [111], respectively.…”

“…The latter can be further classified into geometrybased stochastic models (GBSMs) [34], [35], [101]- [105] and non-geometrical stochastic models (NGSMs) [109], [111] as illustrated in Fig. 3.…”

“…However, the model has not been verified by using real-field measurements and thus deserves more investigation. Authors of [111] have followed similar approach to model the dynamic evolution of multi-path components, i.e., birth-death process, using four-state Markov chain model. The four proposed states are no birth/death, births only, deaths only, and both births and deaths.…”