Uniformity of root-mean-square delay spread in reverberation chamber with different loadings

2017 ◽  
Author(s):  
Lifeng Wang ◽  
Xiaotao Guo ◽  
Zhao He ◽  
Yichi Zhang ◽  
Zilong Zhang
Keyword(s):  
Root Mean Square ◽  
Delay Spread ◽  
Mean Square ◽  
Reverberation Chamber

scholarly journals Analysis of Propagation Characteristics for Various Subway Tunnel Scenarios at 28 GHz

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Chengjian Wang ◽  
Wenli Ji ◽  
Guoxin Zheng ◽  
Asad Saleem
Keyword(s):  
Ray Tracing ◽  
Root Mean Square ◽  
Millimeter Wave ◽  
Measurement Data ◽  
Path Loss ◽  
Small Scale ◽  
Delay Spread ◽  
Mean Square ◽  
Propagation Characteristics ◽  
Subway Tunnels

In order to meet the higher data transmission rate requirements of subway communication services, the millimeter wave (mmWave) broadband communication is considered as a potential solution in 5G technology. Based on the channel measurement data in subway tunnels, this paper uses ray-tracing (RT) simulation to predict the propagation characteristics of the 28 GHz millimeter wave frequency band in different tunnel scenarios. A large number of simulations based on ray-tracing software have been carried out for tunnel models with different bending radiuses and different slopes, and we further compared the simulation results with the real time measurement data of various subway tunnels. The large-scale and small-scale propagation characteristics of the channel, such as path loss (PL), root mean square delay spread (RMS-DS), and angle spread (AS), for different tunnel scenarios are analyzed, and it was found that the tunnel with a greater slope causes larger path loss and root mean square delay spread. Furthermore, in the curved tunnel, the angle spread of the azimuth angle is larger than that in a straight tunnel. The proposed results can provide a reference for the design of future 5G communication systems in subway tunnels.

Person Density Dependency on Path Loss and Root Mean Square Delay Spread for Smart Office Scenarios

2021 ◽  
pp. 1-1
Author(s):  
Yu Yu ◽  
Wen-Jun Lu ◽  
Ting-Ting Liu ◽  
Wen-Hao Zeng ◽  
Yang Liu ◽  
...  
Keyword(s):  
Root Mean Square ◽  
Path Loss ◽  
Delay Spread ◽  
Mean Square ◽  
Density Dependency

Measurement and empirical modelling of root mean square delay spread in indoor femtocells scenarios

2017 ◽  
Vol 11 (13) ◽  
pp. 2125-2131 ◽  
Author(s):  
Yu Yu ◽  
Yang Liu ◽  
Wen-Jun Lu ◽  
Hong-Bo Zhu
Keyword(s):  
Root Mean Square ◽  
Delay Spread ◽  
Mean Square ◽  
Empirical Modelling

scholarly journals Impacts of Absorber Loadings on Simulating the Multipath Channel in a Reverberation Chamber

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Xin Zhou ◽  
Zhangdui Zhong ◽  
Xin Bian ◽  
Ruisi He ◽  
Ke Guan ◽  
...  
Keyword(s):  
Efficient Method ◽  
Multipath Channels ◽  
Delay Spread ◽  
Mean Square ◽  
Reverberation Chamber ◽  
Rms Delay Spread ◽  
Reverberation Chambers ◽  
Digitally Modulated ◽  
Quality Measurements

In reverberation chambers, the multipath channels with different delay characteristics can be generated by loading the chamber with different amounts of absorbers. This paper investigates the impacts of absorber loadings on the delay characteristics based on realistic measurements. An efficient method for estimating the root-mean-square (rms) delay spread in the chamber is presented. Furthermore, it is found that the chamber loadings also significantly affect the quality of a digitally modulated signal and the corresponding modulation quality measurements are performed.

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