^{1}

^{*}

^{1}

^{1}

^{1}

In this paper, the outdoor microcellular radio propagation characteristics at 3.5 GHz are simulated and analyzed by the method of SBR/Image (Shooting and bouncing 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 simulated propagation parameters of LOS (Line-of-sight) and NLOS (None-line-of-sight) have been compared. The analysis of the above results provides the foundation for the coverage of outdoor microcellular systems.

As mobile communication service has increased dramatically in recent years, the microcellular systems [

When a receiver moves along the LOS street A-C-B, the NLOS street A-C-D, the parallel street E-F and the perpendicular street G-H, the path loss and the RMS delay spread are presented in

The RMS delay spread is the square root of the second central moment of power delay profile. It is an important parameter to characterize wide-band multipath channels. In this paper, the RMS delay spread of four paths is plotted in

spread of the NLOS path increases rapidly compared with LOS path, which means intersymbol interference (ISI) is larger than that of LOS region. When the receiver moves along the parallel street (E-F) and the perpendicular street (G-H), the delay spread presents sharp fluctuation for more obstructions hinder the radio wave reaching to the receiver compared to the LOS street.

The formula of the Doppler shift is

the transmitter or the receiver is moving. Therefore, the Doppler shift can be determined (Assuming that the transmitter is fixed and the speed of receiver is 1 m/s). The comparison of the Doppler shift when the receiver moves along four streets are shown in

The angles

The angle

In this paper, the method of SBR/Image is employed to study the radio wave propagation in outdoor microcellular environment at 3.5 GHz. The simulated results show good agreement with the results in the literature, so the correctness of the method has been validated. The path loss curve in LOS path is flat and increases slowly versus distance, the corresponding path loss in NLOS street shows much higher attenuation. The delay spread of NLOS street presents sharp fluctuation compared with that of LOS path, which means intersymbol interference (ISI) strengthen. The value of Doppler shift of path A-C-B, path A-C-D and path E-F are all minus because the receiver runs away from the transmitter. In the perpendicular street G-H, Doppler shift shows severe oscillation and has positive number. The mean angle of arrival (

This work has been supported by National Natural Science Fund under Grant no.61372045 and by the Ministry of Education of Higher Specialized Research Fund for the Doctoral Program under Grant no.20123223120003.

Xue Ma,Yuanjian Liu,Qinjian Shi,Yerong Zhang, (2015) Simulation and Analysis of Outdoor Microcellular Radio Propagation Characteristics Based on the Method of SBR/Image. Journal of Computer and Communications,03,86-92. doi: 10.4236/jcc.2015.33015