说明：  此文档详细描述了多普勒频移以及多径对信号传输的影响。包含原理分析与推导。同时附有完整的程序以及结果仿真图。讲解全面，帮助很大。
(This document describes in detail the doppler frequency shift and the multipath effect on the signal transmission.Contains the principle analysis and derivation.At the same time with complete program as well as the results of the simulation diagram.Interpretation of the overall, a great help.)