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Re: [Discuss-gnuradio] Correlation Estimation Block Oddity

From: Nick Foster
Subject: Re: [Discuss-gnuradio] Correlation Estimation Block Oddity
Date: Wed, 22 Apr 2015 20:17:22 -0700

Short answer: use corr_est as your tag. The corr_start tag is undelayed by the matched filter length, and intended for other purposes (data-aided equalizers, etc.). Andy Walls can say more, but it's enough to say the later three tags are the ones that match the peak of the correlation in the output symbol stream. See corr_est_cc_impl.cc lines 206-214.


On Wed, Apr 22, 2015 at 4:29 PM, Richard Bell <address@hidden> wrote:
Hello all,

I'm using GR 3.7.8. I'm trying to work the new Correlation Estimation block into my design. I'm seeing what looks like unintended behavior for the tag placements. Sometimes the corr_start tag is placed on the same sample as the corr_est, time_est and phase_est tags, but sometimes the corr_start tag is placed a sample earlier then those three tags.

I've attached a screenshot showing this behavior. In the same running flow graph the tag placement will go back and forth between being on the same sample or being off by one sample. As long as the corr_start tag is always on the correct sample I guess this won't break anything, but I figured I'd let you all know what I'm seeing.

I don't have the full design working yet so I can't say myself that the block works.


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