Re: Timing recovery in Digital Synchronous recievers

On 30 May 2007 08:11:51 -0700, BERT <callmevc@xxxxxxxxx> wrote:

On May 29, 3:55 pm, "parth_va...@xxxxxxxxx" <vak...@xxxxxxxxx> wrote:
Hello,

Has anyone worked on a term paper about this classic paper published
by Mueller and Muller in IEEE transactions on Communications, Vol
COM-24 No.5 May 1976?

Or, is there someone who can quicly explain the basic idea behind this
paper? I am used to thinking about extracting a signal simply by
correlating to a known sync and then once the sync frame has be found,
start demodulating the bits after. I am not sure how it works out that
you extract timing from the signal itself.

Thank you.


Actually, Sync detection (which you have mentioned) and symbol timing
recovery are two different things. You can perform sync detection
*after* recovering the timing of the input signal. Another tutorial
paper that you might find helpful on this topic is by F. Gardner
titled "Interpolation in Digital Modems", Parts I and II, IEEE
Transactions on Communications.

Regards,
Vijay.

Well, yes and no. M&M usually requires a good channel estimate and
having a know sync pattern (or preamble or training pattern) helps you
converge your channel estimator adaptively and adjust your timing
error by looking at where the first cursor is. In channels with
significant ISI, just trying to detect edges for symbol timing
recovery doesn't work. One needs equalization which needs str which
needs equalization and round and round it goes.
.

Relevant Pages

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