Study And Analysis Of Three-Dimensional Channel Model In The Next-Generation Cellular Networks And Wlan System

Since the information shows explosive growth with the development of society, the demand of the speed and quality of communication is also increasing rapidly. In order to meet this demand, the high transmission rate and greater transmission capacity are needed in mobile communication. For improving the communication rate, it is either to improve the spectrum utilization, or to use a wider spectrum resource. MIMO and60GHz system has became the main direction of research. MIMO can improve the spectrum utilization greatly and the60GHz system has a very wide free bandwidth. In assessing the related technologies, the channel model is a necessary part.This article will focus on the modeling of MIMO wireless channel and60GHz system, especially the three-dimensional channel model which is much more close to the actual scenario.MIMO wireless channel models are mainly divided into deterministic models and statistical models. The deterministic models represented by the ray-tracing model usually used in cell planning due to the high complexity on time and space. The statistical models usually used in general simulation since their moderate complexity. The geometry-based channel models have attracted the most attention since the SCM was been put forward. The maximum bandwidth SCM supports is5MHz and SCM can only work on the carrier frequency of2GHz, so SCM was extended to SCME that can support100MHz bandwidth and can work on2GHz-6GHz. But all the models are two-dimensional models, they all assuming that the signal transmission plane is located in the plane which is perpendicular to the antenna. In fact the antennas always have elevation angle, and clusters are not always in the same plane,the two-dimensional models have a relatively lager error compared with the reality. Thus, research on three-dimensional channel models is essential.Due to the high carrier frequency in60GHz system, the propagation path loss will increased by20dB to40dB, a wall of15cm thickness will cause about30dB attenuation, the air (oxygen and water vapor) can also cause10-15dB/km attenuation. So60GHz system is generally appropriate for the small range wireless communication such as WLAN and WPAN.In studying the60GHz system channel, since the short wavelength of signal, diffraction does not occur, transmission attenuation is much too high, so only reflection is under considered (usually two generation). The number of propagation paths in channel is relatively small. Take the special propagation characteristic and the actual scenario into consideration, the channel can usually be modeled by the way of simple ray tracing.The work of this paper focus on the following two points:1)Extend the two-dimensional channel model SCME to three-dimensional channel model base on the mathematical analysis, including the extension about antennas and channel parameters, and simulate the channel model.2) Model the60GHz channel based on its characteristic and the actual scenario, and simulate the model.