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| Computers Forum Index » Computer - DSP » Does SNR definition include pilots?... |
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| lkc... |
 Posted: Wed Oct 28, 2009 5:16 am |
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Guest
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Hi,
SNR is usually defined as the power ratio of the signal (some quote wanted
signal) to the background noise.
What is the definition of 'signal'? Does it refer to the useful
information data only? Or does it include the overheads like pilots?
Should the pilots be included in the SNR calculation?
rgds,
lkc |
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| HardySpicer... |
| Posted: Wed Oct 28, 2009 5:55 am |
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Guest
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On Oct 27, 8:18 pm, "lkc" <lkc_pring... at (no spam) hotmail.com> wrote:
Quote: Hi,
SNR is usually defined as the power ratio of the signal (some quote wanted
signal) to the background noise.
What is the definition of 'signal'? Does it refer to the useful
information data only? Or does it include the overheads like pilots?
Should the pilots be included in the SNR calculation?
rgds,
lkc
I don't think it matters as long as you are doing likewise comparisons
and you define what you mean by SNR for your problem.
Likewise in Speech Signals there are various definitions.
Hardy |
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| Eric Jacobsen... |
| Posted: Wed Oct 28, 2009 9:54 am |
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Guest
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On 10/27/2009 8:18 PM, lkc wrote:
Quote: Hi,
SNR is usually defined as the power ratio of the signal (some quote wanted
signal) to the background noise.
What is the definition of 'signal'? Does it refer to the useful
information data only? Or does it include the overheads like pilots?
Should the pilots be included in the SNR calculation?
rgds,
lkc
*Very* generally, the SNR is the ratio of the total received signal
power to the received noise power. In other words, all pilots, guard
intervals (e.g., cyclic prefix), etc., etc., are *generally* included.
If you're working across organizations or with a system that is tightly
specified or standardized, the best thing to do is clarify this with
others who work on the same system. When it comes down to it there can
be significant and important issues in carefully defining SNR, and the
only way to be sure is in the specific context where one is working.
--
Eric Jacobsen
Minister of Algorithms
Abineau Communications
http://www.abineau.com |
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