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I read below that SNR and CNR are different and we have difference of post/pre modulation. In context of LTE which modulation do we refer to- Digital Data modulated using QAM/QPSK to IQ, or Baseband modulation to Passband/RF?

https://www.rfwireless-world.com/Terminology/Carrier_to_Noise_Ratio_versus_Signal_to_Noise_Ratio.html

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  • $\begingroup$ well, I'm really not sure what exactly a carrier is in an OFDM system. Could you elaborate? (long story short: the distinction between SNR and C/N is not really useful here. You'd tend to care more about SNR when building a receiver) $\endgroup$
    – Marcus Müller
    Commented Nov 10, 2021 at 16:12
  • $\begingroup$ teletopix.org/4g-lte/… I read here, honesty I'm not sure about clear distinction, that's why wanted to explore more. $\endgroup$
    – Reddi Suresh
    Commented Nov 10, 2021 at 16:15
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    $\begingroup$ yes, that's just another resource saying "it's the ratio of power between the carrier and...", and I'll honestly say, "carrier" isn't really a well-defined word in the context of OFDM. You ask "where is SNR and where CNR calculated for LTE" and the answer is "LTE itself uses neither metric, because they're not that useful". $\endgroup$
    – Marcus Müller
    Commented Nov 10, 2021 at 16:17
  • $\begingroup$ again "where is it calculated": LTE doesn't use that measure in itself, so you're totally free to define it however you want. $\endgroup$
    – Marcus Müller
    Commented Nov 10, 2021 at 16:25
  • $\begingroup$ Ok, thank you for explaining this. $\endgroup$
    – Reddi Suresh
    Commented Nov 10, 2021 at 16:26

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