Vehicular Channel in Urban Environments at 23 GHz for Flexible Access Common Spectrum Application

Abstract

With the development of the vehicular network, new radio technologies have been in the spotlight for maximizing the utilization of the limited radio spectrum resource while accommodating the increasing amount of services and applications in the wireless mobile networks. New spectrum policies based on dynamic spectrum access technology such as flexible access common spectrum (FACS) have been adopted by the Korea Communications Commission (KCC). 23 GHz bands have been allocated to FACS bands by the KCC, which is expected extensively for vehicular communications. e comprehensive knowledge on the radio channel is essential to effectively support the design, simulation, and development of such radio technologies. In this paper, the characteristics of 23 GHz vehicle-to-infrastructure (V2I) channels are simulated and extracted for the urban environment in Seoul. e path loss, shadow factor, Ricean K-factor, root-mean-square (RMS) delay spread, and angular spreads are characterized from the calibrated ray-tracing simulation results, and it can help researchers have a better understanding of the propagation channel for designing vehicular radio technologies and a communication system in a similar environment.

Channel characteristics analysis of millimetre‐wave bands in Hyperloop scenarios based on ray‐tracing

“…Frequency carrier Model Scenario [14] 4.85 GHz Propagation-graph Hyperloop [20] 58 GHz GBSM Hyperloop [21] 5 GHz GBDM Hyperloop [15] 23 GHz Ray-tracing V2I in urban [16] 5.9 GHz Ray-tracing V2V in urban [17] 25/40 GHz Ray-tracing Intra-metro tube. The transmitter (Tx) is fixed on the top of the tube.…”

“…Ray-tracing is a deterministic method that is widely used because of its high accuracy, particularly because electronic waves exhibit an obvious mechanism of reflection at high-frequency bands. Numerous works have used this method to analyse various scenarios, such as the works on vehicle-toinfrastructure (V2I) and vehicle-to-vehicle (V2V) scenarios in [17,18], and the works on the intra-waggon environment for 5G between 25 and 40 GHz in [19]. The RT method is a channel modelling method with high accuracy and it was widely used and validated in the communication simulation in the existed environment.…”

Satellite‐Terrestrial Channel Characterization in High‐Speed Railway Environment at 22.6 GHz

“…Table summarizes electromagnetism (EM) parameters of the involved materials, where is the real part of the relative permittivity, is the loss tangent, and and are the scattering coefficient and scattering exponent of the directive scattering model (Degli‐Esposti et al, ; Wang et al, ). Particularly, parameters of the wood and concrete are calibrated (Wang & Sarabandi, ).…”