MIMO multipath delay [duplicate]

1. What is multipath delay spread?
2. What is the reason behind receiving multiple copies of the transmitted signal with varying delays?
3. How do you overcome multipath propagation?
4. What is the effect of multipath propagation on the quality of a received signal?

What is multipath delay spread?

Delay spread is a measure of the multipath profile of a mobile communications channel. It is generally defined as the difference between the time of arrival of the earliest component (e.g., the line-of-sight wave if there exists) and the time of arrival of the latest multipath component.

What is the reason behind receiving multiple copies of the transmitted signal with varying delays?

The multipath is nothing but the same signal arriving to the receiver through different paths and hence with different delays or phase shifts. The delay profile of the channel provides multiple versions of the transmitted signal at the receiver.

How do you overcome multipath propagation?

Before you clear the office of all its furniture or cut down that tree in your backyard, there is a simple way to reduce the effect of multipath and the answer is spatial diversity. Spatial diversity is usually achieved by having two or more antennas connected to separate radios inside a wireless device.

What is the effect of multipath propagation on the quality of a received signal?

During data transmission in a hydroacoustic channel, one of the problems is the multipath propagation effect, which leads to a decrease in the transmission parameters and sometimes completely prevents it.