Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Power attenuation of different paths in Rayleigh channel

Status
Not open for further replies.

bravoegg

Member level 2
Joined
Mar 28, 2016
Messages
51
Helped
1
Reputation
2
Reaction score
1
Trophy points
8
Activity points
501
When a signal travels through a mutipath channel, there're lots of delayed version of the original signal. So when signal A is transmitted, we receive A0 first, then A1, then A2... and finally An.

My first intuition is the shorter the signal travels, the less it suffers from channel attenuation, then the power of A0 must be larger than A1, A2,...An. But then it occurred to me that, other than power loss due to distance, signal might get absorbed along the way. But I'm not sure how this works.

Here's a graph of power profile according to different delay, under Rayleigh channel.
1.png

Here' a graph of power profile according to different delay, under Rich Channel.
2.png

My question is is concerning the 1st graph. Why would the shortest path be smaller in terms power?

- - - Updated - - -

with further googling, I found this post:
https://www.gaussianwaves.com/2014/07/power-delay-profile/

in it, a 3GPP spec supports my earlier belief:More delay results more power loss.
Power-Delay-Profile-3GPP.png
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top