现代通信技术的一个重要特点是计算机技术与通信技术的紧密结合.随着无线移动通信的快速发展,传统移动蜂窝频段的频谱资源面临严重短缺的局面,开展着眼于高频段的开发与利用已经刻不容缓.为此,应用基于PN序列的时域测量系统,在15 GHz频段的室外环境下,以波束宽度为10°、增益为25 dBi的标准增益喇叭天线和增益为5 dBi的垂直极化的双锥全向天线为研究对象进行了直视场景的信道测量;测量数据的处理采用基于floating intercept模型的滑动相关算法,应用最小二乘法建立了距离与路径损耗之间的相互关系,并计算获得了室外环境下路径损耗指数和阴影衰落,由此分析了传播信号的大尺度特性.实验测量结果表明,15 GHz频段在室外环境下的良好传播特性,在未来5G通信中具有较为显著的应用前景.%An important feature of modern communication technology is the close combination between the computer technology and com-munication technology. With the rapid development of wireless mobile communication,traditional mobile cellular frequency spectrum re-source is such shortage that development and utilization of high frequency has become urgent. Therefore,the time domain measurement system based on PN sequence is employed to measure propagation characteristics of the outdoor environment in 15 GHz with the use of an horn antennas with 10゜HPBW ( Half-Power Beam Width) and 25 dB gain and a vertical polarization double cone omnidirectional antennas with 5 dB gain. The sliding correlation method has been used for processing data combined with floating intercept model and least square method applied to acquire the relationship between the distance and the path loss by which the path loss exponent and the shadow fading standard variance could be achieved for analysis of large scale features of the transmitted signals. Experimental results show that the signals at 15 GHz have good propagation characteristics in the outdoor environment and that it is the potential spectrum with a good perspective of application in future 5G communications.
展开▼
