The“distance-loss”model is amended by inserting a random distance-estimation variable.The estimation error is very small;thus,it does not change the log-normal distribution of the shadowing factor in the model.Then,...The“distance-loss”model is amended by inserting a random distance-estimation variable.The estimation error is very small;thus,it does not change the log-normal distribution of the shadowing factor in the model.Then,an iterative method is introduced to reduce the influence of shadowing,and the location estimation based on the received signal strength will be improved.Simulations show that this algorithm is effective.展开更多
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....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 d B,σFI增大1.99 d B,σCI增大0.37d B。此外,在高频段CI模型的鲁棒性要强于FI模型。展开更多
基金supported by the National Natural Science Foundation of China (No.60172021).
文摘The“distance-loss”model is amended by inserting a random distance-estimation variable.The estimation error is very small;thus,it does not change the log-normal distribution of the shadowing factor in the model.Then,an iterative method is introduced to reduce the influence of shadowing,and the location estimation based on the received signal strength will be improved.Simulations show that this algorithm is effective.
文摘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 d B,σFI增大1.99 d B,σCI增大0.37d B。此外,在高频段CI模型的鲁棒性要强于FI模型。
