| Time division-long term evolution(TD-LTE) is proposed by China for quick development of high speed data communications. TD-LTE is based on long-term evolution(LTE) technology of 3GPP and time division-synchronous code division multiple access(TD-SCDMA) technology which belongs to China. D band(2.6GHz) is used in outdoor TD-LTE network. The propagation characteristics of D band is different from that of the radio wave is used in 2G, 3G wireless network. Therefore, the study of propagation characteristics of D band has great significance for planning and optimizing TD-LTE wireless network. In this thesis, the propagation characteristics of D band in outdoor microcell environment are simulated and analyzed by the method of shooting and bouncing ray tracing/Image(SBR/Image).The main contents of this thesis are as follows:(1) In this thesis, a novel method which can accurately determine all ray tubes that reached receivers is presented. This method can effectively improve the computation efficiency.(2)The propagation characteristics of outdoor microcell environment are simulated and analyzed. A good agreement is achieved between the simulated results and the results given in published literatures. So the correctness of SBR/Image has been validated.(3)Some propagation characteristics of microcell environment with dense residential buildings are simulated and analyzed. Several propagation parameters are obtained in the simulation, such as distribution of received power, path loss and so on. The maximum path loss are respectively 116.21 dB and 138.23 d B under the line of sight and non line of sight propagation conditions. The area coverage can be calculated according to the maximum path loss.(4)The effects on D band radio propagation characteristics caused by different frequency, antenna height and antenna directivity are compared in this thesis. The simulation results indicated that the path loss of 2.6GHz band is larger 10 d B than that of the typical 900 MHz band in mobile communication. Antenna height has little effect on the radio wave propagation characteristics of D band.(5) The propagation characteristics of typical campus environment with dense trees at D band are simulated and analyzed. Dense trees on the impact of radio wave propagation characteristics is a research focus in this chapter. Serious signal attenuation caused by the shade of dense trees is indicated in the simulation results. At the same time, the comparision of line of sight and none line of sight propagation characteristics is presented in this thesis. |
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