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What is the Reference Signal ?

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David G

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Jan 21, 2024, 10:26:07 AM1/21/24
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I am new in this field and I don't understand how the PSD is calculated because if it's the unit is "dB" then It means that a reference signal exists to calculate the PSD of my signal, or maybe I am wrong. If I am not wrong, what is the power of this signal? 

thank you in advance,

D G
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