Hi Marcus,
>
>>
> I am simply doing OOK.
>
>
>> Generally, [image: $\frac{S+N}{N}$] is only really a useful measure if
>> you either have
>>
>> 1. a constant power modulation (e.g. PSK), or
>> 2. whiten your over-the-air bits sufficiently (using *coding*), so
>> that for (stochastically speaking almost any) data sequence, the signal
>> power is the same.
>>
>> Usually, even when you have 1., you do 2..
>>
> so the above formula is what I am using currently over the whole message
> run, and for similar amount of time when no message was transmitted to get
> S+N/N .
> I have looked through Gnuradio docs and doesn't seem to appeal that there
> is any of the four would work.
>
> Sorry, I don't understand what you're referring to; could you explain?
>
Apologies for being inarticulate.
I don't think OOK is constant power modulation, but I suppose S+N/N should
still apply on it.
I am using the formula by calculating the following:n
a) Use the iq samples of the data part of the transmission to get S+N
b) Measure noise for same number of samples (when the transmission is not
going on) to calculate expected value of N
Divide the two and take the log to get the SNR value for the scheme.
Is that correct ?
Thanks,
Abhinav
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