I wonder in cellular communications, the base station obtained the desired signal from a mobile user from multipath effects, so that Doppler effect due to motion of user and reflection of radio waves by barriers causes a certain amount of interference since different radio rays are not exactly in the same phase as each other. How does the receiver end decode such signals at the demodulation stage? How can demodulator be so smart to decode such signals with so much interference?

since the sigs travel at Light Speed (or there abouts) any relative movement from you will be so insignificat as to not even pressent a problem

 

also the use of PPL technology and multi-band switching will compensate for the rest of it.

 

anything else is just an attenuated signal that the AGC can`t compensate for

 

 

edit: Damn my typos to hell and back! LOL )