Modulation error ratio

Modulation error ratio (MER) is like playing a game of catch with a friend. You throw a ball to your friend, and they catch it. But sometimes, the ball doesn't go where you want it to go, and your friend can't catch it. That's a mistake.

In communication, we're sending information from one place to another. Just like throwing a ball, we're sending a signal that carries information. The signal can go through the air or through wires. But sometimes, the signal doesn't go where we want it to go, and the information gets lost. That's also a mistake.

To make sure we don't make mistakes, we use something called modulation. Modulation is like adding extra spin to the ball when you throw it to your friend. This extra spin makes the ball easier to catch because it stays on track.

In communication, we also add extra spin to our signal, so the information stays on track. This extra spin is like adding a pattern to the signal. It helps the signal stay organized and easy to read.

But sometimes, the extra spin is too much, and the signal gets confusing. It's like throwing the ball with too much spin. Your friend can't catch it because it's spinning too fast. This confusion is called noise.

Modulation error ratio (MER) measures the extra spin we add to the signal (the pattern) compared to the noise. The higher the MER, the easier it is to catch the signal (like catching a ball with extra spin).

To sum up, modulation error ratio is like playing catch with a friend, where the spin you add to the ball is like the pattern added to the signal, which makes it easier to catch. And the ratio between the spin and the noise is like the MER, telling us how easy it is to catch the ball or the signal.