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The indoor visible light propagation characteristics are simulated and analyzed using the method of SBR/Image (shooting and bounding ray tracing/Image). A good agreement is achieved between the results simulated and the results given in published literature. So the correctness of the method has been validated. Some propagation parameters are obtained in the simulation, such as the indoor received power distribution, statistical distribution of phase angle of received power, RMS (root mean square) delay spread, direction of arrival, and Doppler shift. The foundation for the wireless network coverage of indoor visible light communication system is provided by the analysis of the above results.

Ray tracing method is an effective way to study radio propagation in the outdoor microcellular. In this paper, outdoor propagation characteristics at 28GHz are simulated and analyzed by the method of SBR/Image (Shooting and bouncing ray tracing/Image). And then the propagation parameters of LOS (Line-of-sight) and NLOS (None-line-of-sight) are compared between 28GHz and 2.6GHz radio wave. The analysis provides the foundation for the coverage of outdoor microcellular systems.

As the rapid development of the mobile communication technology in recent years, predicting the propagation characteristics for urban area have become an important subject. In this paper, the propagation characteristics in typical outdoor environment at 3.5GHz are simulated and analyzed by using the method of SBR (shooting and bounding ray tracing). It is agreed well by a comparison of simulated results and results in the literature, so the correctness of the method has been validated. Some propagation characteristics are obtained in the simulation, such as the path loss, delay spread and Doppler shift. The concrete analysis of the above results provides the theoretical foundation for outdoor micro-cell at 3.5GHz in the communication system, and benefits planning the base station and optimization of urban micro-cellular environment.

In this paper, the propagation characteristics of radio wave is studied in tunnel environments based on the method of SBR/Image (Shooting and bounding ray tracing/Image). An agreement is achieved by a comparison of simulated results and measured results. The formula of field strength considering polarization has been derived. Then the tunnel physical model has been set up. Some propagation parameters have been obtained in the simulations, such as the received power, delay spread, Doppler shift and so on. The simulated results indicate that the delay spread will become increasingly smaller and almost has no relationship with radio waves frequency in the long rectangular tunnel with the increase of propagation distance. Doppler shift changes between -10Hz~-110Hz when the radio frequency is 900MHz and receiver moving speed is 40m/s. Theoretical basis for wireless network communication planning and optimization in tunnels can be provided by above results.

In this paper, a novel deterministic splitting method of ray tubes(DSMRT) based on ADRTT (adaptive ray tube tracing) is proposed to predict the indoor radio propagation characteristics. It is agreed well by a comparison of simulated results and results in literatures. The novel splitting method of ray tube shows a large improvement in computational efficiency compared by conventional methods.

The characteristics of radio propagation is the important part of communication system. The polarization model is the crucial characteristics of radio propagation. The prapogation characteraction of indoor micorcelluar wireless radiowave has been studied based on the method of Ray tracing. Furthermore, the polarization characteraction of reflection has been analyzed and the three-dimension model of ray tracing has been founded. The prediction of field strength has been done with this model in indoor environment. A good agreement is achieved between the simulated results and the published results.

In this paper, we will propose a novel approach to the radio propagation channels in complex indoor environments. This technique is called the deterministic splitting method of ray tubes. The prediction of field strength has been done with this method in indoor environments. A good agreement is achieved between the simulated results and the published results.

Investigating the propagation properties of Ultra-wideband (UWB) is the essential topics in UWB channel theory. Based on Fourier transform theory, the distortion of various UWB impulse waveforms with indoor refraction is studied in this paper. A comparison of Fourier transform results with time-domain accurate results shows good agreements. Finally, Properties of pulse waveform distortion is analyzed.