@Ron Economos: Thanks for your reply.I've looked about the code.I think
that maybe I'll implement it in the future,but not now: is too specific to
a single application

@Marcus Müller:I've looked about correlate_and_sync method(are you speaking
about it,isn't it?)Ye it can take good advantage from CUDA..
Ye,I've a FIR implementatio and I'm looking also for an FFT(with device
code,so unlucky without cuFFT library).
here the problem is not only data outgoing from the block,but relative
tags.also because for the moment I'm not supporting tags on the flow above
CUDA.If u have good idea about how manage them,feel free to speak.

While I was reading the code,a question arise about this code( method work in
cc implementation):

while(i < noutput_items) {
        if((corr_mag[i] - corr_mag[i-d_sps]) > d_thresh) {
          while(corr_mag[i] < corr_mag[i+1])
            i++;

is not possible that the variable i will go outside the array corr_mag?I
know that is necessary a strange pattern in order to have the last item
greater than the previous..

Greetings,
marco ribero
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