Re: Discuss-gnuradio Digest, Vol 206, Issue 5

[Qasim Chaudhari]

Hi Luke

    If you have only 100 or so bits to acquire and correct the timing, I would recommend you to use the method below commonly known as digital filter and square timing recovery.

https://pdfs.semanticscholar.org/7fdc/faa4577ab9ca47257de5392072202a94f0a8.pdf

Cheers,

Qasim

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Message: 3
Date: Fri, 6 Dec 2019 20:54:57 +0100
From: "Lukas Haase" <address@hidden>
To: "Andy Walls" <address@hidden>
Cc: address@hidden
Subject: Re: Discuss-gnuradio Digest, Vol 206, Issue 5
Message-ID:
        <trinity-49271353-9e36-41c4-a8d4-7d01289f2cb5-1575662097637@3c-app-gmx-bap25>

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Hi Andy,

On 2019-12-06 14:28, Andy Walls wrote:
> [...]
>
> The M&M clock recovery block is obsolete.  Use the Symbol Synchronizer
> block instead, if you must use the M&M TED.

Thank you.

You do not mean "Polyphase Clock Sync" but "Symbol Synchronizer"? Is this part of the standard blocks in GRC?
Because in my 3.7.11 versions (current Ubuntu) I do not find it.

I do not must use the M&M TED.

All I need to do is asynchronously detect a stream of bits like this: https://paste.pics/a48ec4aef5ddeeef74e96255d72288b3

Maybe there is a better way to do this?
Important key figure is fast settling/lock time because I cannot afford loosing bits (one burst is only 100 or so bits long).

> [...]
>> Is there anything I am doing wrong?
>
> You may want to read this presentation:
> https://www.gnuradio.org/grcon/grcon17/presentations/symbol_clock_recovery_and_improved_symbol_synchronization_blocks/Andy-Walls-Samples-to-Digital-Symbols.pdf

Thank you, I am studying it.

Best,
Luke