Hi Pedro,
$y[n]=\sum\limits_{i=n-N+1}^n {\left|x[i]\right|^2}$ is nothing but the
moving average over the squared magnitude.
Sadly, your formula
$T=\sum\limits_{n=0}^{N-1} {\left|Y[n]\right|^2}$ doesn't specify what T
signifies; is T used as a single sum over N samples' squared magnitudes,
or is it something running (i.e. you get as many Ts as you consider samples.
I just assume you really are looking for a moving average, in which case
your flow graph is correct.
> Timothée told me to use stream to vector, but if I pack them, each 100
> samples will become one single information, right? What I need is more
> like a controller that gives me 100 samples at a time.
Really, I'm not sure where the formula you attached came from, or what
you mean, or if what you mean is what you need...
Maybe you could just write down, explicitely, what *each* output sample
should be (which is why I wrote $y[n]$ rather than $y$).
Best regards,
Marcus
On 12.01.2016 17:27, Pedro Gabriel Adami wrote:
> Dear all,
>
> In addition to my previous response, I'm attaching an image that shows
> the formula I'm trying to build in gnuradio (using blocks). But
> instead of n = 0 and N-1, I need n = 1 and 100 (100 samples). The
> second picture shows how I tried to do in Gnuradio, but the moving
> average block does not get 100 samples the way I need (as we could see
> in the previous answers).
>
> Timothée told me to use stream to vector, but if I pack them, each 100
> samples will become one single information, right? What I need is more
> like a controller that gives me 100 samples at a time.
>
> Please, I appreciate if you could give me some tips.
>
> Thanks in advance.
>
> 2016-01-08 14:47 GMT-02:00 Timothée COCAULT
> <[email protected] <mailto:[email protected]>>:
>
> Whoops, just noticed I didn't reply to all when I answered so my
> message and Pedro's response were not forwarded to the mailing list :
>
> Le jeu. 7 janv. 2016 à 20:28, Pedro Gabriel Adami
> <[email protected]
> <mailto:[email protected]>> a écrit :
>>
>> Dear, Timothée,
>>
>> Thank you so much. I am doing some tests and I've realized that
>> the results are a little strange. That is why I asked.
>>
>> Let me ask you one more thing: Do you know some block that is
>> capable to retain N samples, so I can use them and after that, it
>> retains the next N samples? Like a variable where I can "save"
>> the information for a short period of time, but my Gnuradio does
>> not have a "variable sink".
>>
>> Thanks in advance.
>>
>> Em 07/01/2016 17:18, "Timothée COCAULT"
>> <[email protected] <mailto:[email protected]>>
>> escreveu:
>>
>> Hi Pedro,
>>
>> When you're not sure, the best solution is often to look at
>> the code.
>> If you look at the work function in
>> gr-blocks/lib/moving_average_XX_impl.cc.t, you see that the
>> block first sums the history (of length 100 in your case).
>> For each additional input items, it adds the new item and
>> subtracts the n-100 item, and outputs the current sum.
>>
>> So it will first calculate 1+...+100, then 2+...+101 and so on.
>>
>> Regards,
>> Timothée.
>>
>>
>>
>>
>
> I don't understand exactly your question but you can use a stream
> to vector to group your items in packets of size N, and plug it
> into a probe signal
>
>
>
>
> --
> Atenciosamente,
> Pedro Gabriel Adami
> Graduando do 5º período de Engenharia de Controle e Automação no
> Instituto Nacional de Telecomunicações - Inatel
>
>
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