Re: [Discuss-gnuradio] correlation estimator reliability problem

On 1/31/19 6:39 AM, Alban Meffre wrote:
> Hi All
> did someone make the test_corr_est.grc example work properly recently ?
> i tried the 3.7.13 gnuradio version on linux, macos and windows
> in all versions the output of the correlation estimator block is really
> a mess
> this block put tag even if there is no signal at all, with corr_est = 0

It's an easy way to find it.

Post your

test_corr_est.grc

file.

-- Cinaed

>
> yesterday i managed to transmit a realtime MPEGTS videosignal using the
> gnuradio example packet_tx ->  packet_rx. i used an analog devices ADALM
> PLUTO as an emitter and a RTLSDR as a receiver. both antenna where put
> side by side at a few centimeter distance so the received baseband
> signal had an amplitude near 0.5
>
> the problem was that the transmission did not work for more than few
> tens of second because the correlation block added misplaced tags every
> now and then and put the header/payload demux in a locked state so i got
> #f and no more packet output !
>
> another problem is that if i set the thershold to 0.9999, 0.99999 or
> more 9's, the result is not satisfying.
> is someone able to explain me how to use correlation estimation block in
> a reliable way ?
> do i need to set the thershold to ABSOLUTE mode ?
>
> thanks
> bob
>
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