We just started a communications course in college and we came across SN ratio. The following is an ambiguity I am facing which my professor is unable to resolve:
Signal to Noise Ratio is the ratio of signal power to the noise power. It is often expressed in decibels. But it is a ratio of two similar quantities, so it must not have a unit right? Why then do we use decibel?
If anybody could answer this question or provide links to resources which solve it, I would be very grateful.
PS: I tried Google and Wikipedia but I could not find anything specifically related to this.