GEO双极化多波束卫星移动通信系统信道建模

Channel modeling of dual-polarized multi-beams GEO mobile satellite communication systems

研究了采用双极化数字多波束阵列天线的地球同步轨道(GEO)卫星移动通信(MSC)系统的统计特性,建立了多用户多波束系统统计模型,进而利用该模型给出了计算机仿真方法。通过仿真揭示了用户所处环境、用户位置分布、天线交叉极化鉴别度及莱斯因子等因素对系统平均频谱效率的影响。仿真结果显示,系统以重阴影用户为主要服务对象时,平均频谱效率明显减小,用户分布越靠近波束中心频谱效率越大,高菜斯因子信道天线交叉级化鉴别度对频谱效率影响很大。

The statistical properties of geostationary earth orbit （GEO） mobile satellite communication （ MSC ） systems using dual-polarized digital multi-beam array antennas were studied, and a statistical model for the dual-polarized multi-beam GEO MSC systems was established. Then, a computerized simulalion method was put forward based on the statistical model. And through the simulations conducted by the proposed method, the influences of surround- ings of user, locations of user, cross-polar discrimination of the antenna, and K-factor on the average spectrum effi- ciency of the considered systems were revealed. The results show that if users are mainly in heavy shadowing, the average spectrum efficiency will decrease evidently. And if the users are near the beam center, the owerage spec- trum efficiency will increase. In addition, for a high K-factor channel, the cross-polar discrimination of antenna has a strong impact on the spectrum efficiency.