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Ray-based and hybrid propagation models are today considered as valuable solutions to fulfill 5G wireless channel modeling requirements. They are a complement or alternative to the stochastic approaches when link-level and system-level simulations deal with millimeter-wave (mmWave), ultra-dense deployment and/or large antenna arrays. The present article proposes an extension of an urban ray-based...
This paper presents an analysis of the polarisation characteristics for the channel in dynamic off-body communications, and an empirical channel model, based on measurements performed at 2.45 GHz in an office environment. Body presence and propagation conditions have a strong influence on signal depolarisation. The model assumes three components for the total path loss: mean path loss, represented...
In the race towards ultra-high-data-rate wireless communication systems, terahertz (THz) band communication is envisioned as a key wireless technology to satisfy this demand and overcome the spectrum scarcity of current wireless systems. As more and more users prefer to accessing digital information with mobile device anytime and anywhere, the close proximity data transfer are needed. In this paper,...
Compared to rail/road tunnel the characteristics of electromagnetic (EM) wave propagation in underground mine tunnel is significantly different. For reliable operation of wireless communication system in underground mine environment; an understanding of radio signal behavior in such confined space is crucial. This paper discusses the experimental findings carried out in an operational underground...
The paper proposes a geometrical-statistical modeling approach for the air-ground channel for communications, navigation, and surveillance (CNS) systems in the L-band frequency range. We sketch the architecture of the model with its six elements and show how their parameters can be derived from measurement data. Preliminary results obtained from a relatively small set of measurement data reveal that...
Radio wave propagation from a satellite based emitter to an airborne located receiver is of interest for applications like passenger internet access during a flight, air traffic management or positioning by global navigation satellite systems (GNSSs). Especially for the last two applications that are related to safety-of-life functionality, accurate channel models for software based system testing...
Studies of the level-crossing rate (LCR) and the average duration of fades (ADF) are so far only devoted to stochastic processes being a function of one independent variable, which is usually time or in some few cases frequency. In this paper, we study the LCR (ADF) of wide-sense stationary uncorrelated scattering (WSSUS) processes in the time-frequency domain. A closed-form solution will be derived...
A wireless channel is always composed of both deterministic and stochastic multi-path components. A high Rician K-factor increases the contribution of deterministic channel components, thereby reducing the significance of stochastic parts of a channel. This paper focus at the investigative analysis of K-factor and fading depth to analyze the deterministic behavior of a channel under a certain bandwidth...
Directional beamforming can increase network capacity significantly with spatial multiplexing, especially for the hot spots such as airport, shopping malls, and stadiums. Accurate characterization and models of the spatial propagation in these indoor environments are required. In this paper, a 3-dimensional channel measurement campaign in a large gymnasium is presented. A wideband sounder equipped...
In implementing fifth generation (5G) networks, the advancements in density of networks, cell size, scale of antenna arrays, communicating nodes mobility, and range of frequencies necessitate to derive a reliable and appropriate channel model. A geometric three dimensional (3-D) tunable channel model is proposed with high degree of flexibility in modelling the orientation, shape, and scale of the...
Massive MIMO is a multi-user technology, where radio base stations (BSs) are equipped with a large number of antennas to simultaneously serve many terminals in the same time-frequency resource. Performance evaluation of such large-scale antenna systems in the design and development stage is challenging. In this paper, we propose to evaluate massive MIMO BSs with a sectorized multi-probe anechoic chamber...
Emulation of a realistic environment is modeled in an anechoic chamber to measure the performance of a Base Station Massive MIMO Array antenna using a Spatial Channel Model. The first bounce path establishes the angles of departure and angle spreads observed by the MM array and each is produced by probes placed in the chamber. A channel emulator is utilized to model the full connection between the...
The move of cellular communications from existing frequencies predominantly below 3 GHz up to the lower end of the mmWave bands around 28 GHz and higher, is set to change everything about how we design, test and operate such systems. The successful launch of a new radio (NR) access system is critically dependent on a correct understanding of the quasi-optical propagation behaviour of narrow beamwidth...
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