室外28 GHz信道阴影衰落因子估计算法的研究
Estimation algorithm of shadowing factor for outdoor channels at 28 GHz

阴影衰落方差是表征信道大尺度特性的重要参数。采用连续波信道测量方法，基于自由空间参考距离损耗模型（Close In（CI） Reference Distance Path Loss Model）和浮动截距损耗模型（Floating Intercept（FI） Path Loss Model），分析了4.5 m和7.8 m接收机高度下的路径损耗指数n、损耗截距α、斜率β和阴影衰落方差σ等参数。分析表明增大接收机高度，截距α减小11.8 dB，σFI增大1.99 dB，σCI增大0.37 dB。此外，在高频段CI模型的鲁棒性要强于FI模型。
Standard deviation due to shadowing is an important parameter for characterizing the large scale fading channel.Based on close in (CI) reference distance path loss model and floating intercept(FI) path loss model,continue wave channel measurements are conducted to analyzes the influence of the receiver height on path loss exponent n,intercept α,slope β,and shadowing fading variance σ.The results show that the intercept α decreases 11.8 dB,the standard deviation σFI increases1.99 dB,σCI increases 0.37 dB when the receiver height increases.In addition,CI path loss model can obtain more robust attenuation exponent than that of the FI model