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Re: [Discuss-gnuradio] Channel Model and SNR
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From: |
Martin Braun |
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Subject: |
Re: [Discuss-gnuradio] Channel Model and SNR |
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Date: |
Mon, 27 Jul 2015 11:30:16 -0700 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.8.0 |
On 25.07.2015 16:38, Richard Bell wrote:
> I'm trying to figure out how to convert the channel model noise voltage
> value into an SNR value for a simulation I'm making. The user wants to
> be able to enter an SNR value and simulate the BER. So I'm looking at
> the source code for Channel Model, and two things happen:
>
> 1) I would conclude that the Noise Voltage value corresponds to the
> standard deviation of the noise that will be produced, am I correct?
For a while, it was the standard deviation of a 1-D normal distribution,
so for complex data, you'd need to scale it up (because there you have a
2-D normal distribution). Check out the noise_power.grc example for more
help.
Remember that you usually want Eb/N0, which is clearly defined, whereas
SNR is a bit fuzzy and can mean all kinds of things.
Cheers,
Martin