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[Discuss-gnuradio] correlation estimator reliability problem

From: Alban Meffre
Subject: [Discuss-gnuradio] correlation estimator reliability problem
Date: Thu, 31 Jan 2019 15:39:56 +0100

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

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 ?


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