Multipath Propagation and Multipath Channel¶
In this article, we will examine the effect of multipath propagation to a transmitted signal. Furthermore, we will illustrate the effect with the help of audio examples (scroll down for the examples).
First, let's try to understand the transmission of a signal from a source S to a destination D, which are d meters apart:
If we assume, the signal travels with velocity c, it will take \tau=\frac{d}{c} seconds until it arrives at the destination. Mathematically, we have
y(t)=x\left(t-\frac{d}{c}\right),where x(t) is the transmitted signal and y(t) is the received signal. Now, we know that the signal from the source is not only transmitted into the direction of D, but in all directions. Let's assume somewhere around the source, there is a big wall that can reflect the signal:
So, at the destination we receive two copies of ...