# When you plot BER against Eb/No, why you need to apply log base 10 to Y-axis?

1. ## When you plot BER against Eb/No, why you need to apply log base 10 to Y-axis?

When ploting BER against Eb/No, why we should apply log base 10 to Y-axis or BER value?

because the graph will be totally different when you dont apply log base 10.

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2. ## Re: When you plot BER against Eb/No, why you need to apply log base 10 to Y-axis?

In logarithmic scale you can see clearly small error rates.
In linear scale, if the Y axis spans from 0 to 1, you could not distinguish for example 1e-3 from 1e-4 or 1e-9 or less.
There is a big big difference in performance between those values. You could not distinguish a good system and a bad one with a sight. In log scale you can.
Regards

Z

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3. ## Re: When you plot BER against Eb/No, why you need to apply log base 10 to Y-axis?

To give a better visualization of the fine error rates that have different order of magnitude but are all very small and looks close to each other in linear scale.

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4. ## Re: When you plot BER against Eb/No, why you need to apply log base 10 to Y-axis?

Thank you so much for both of you. Those are very clear :)

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