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From: Vladimir Vassilevsky on 20 Jul 2010 09:48

Hello Baranov

The most universal and dumb method is not doing any carrier recovery.
Receive your signal incoherently.

Vladimir Vassilevsky
DSP and Mixed Signal Design Consultant
http://www.abvolt.com


mtr wrote:

> Hello. We are making some sdr thing. So there is a need to catch carrier
> frequency for down shifting. We know nothing about baseband signal, except
> may be that it was digital or analogue modulated. Could anyone suggest any
> method?
> We're computing everything with modern pc, so there is no problem with
> arg(), log10(), sin()/cos(), square or square root and so on.
>
> Thank you in advance
>
>
From: Jerry Avins on 20 Jul 2010 09:55
On 7/20/2010 7:15 AM, mtr wrote:
> Hello. We are making some sdr thing. So there is a need to catch carrier
> frequency for down shifting. We know nothing about baseband signal, except
> may be that it was digital or analogue modulated. Could anyone suggest any
> method?
> We're computing everything with modern pc, so there is no problem with
> arg(), log10(), sin()/cos(), square or square root and so on.
>
> Thank you in advance

A PC? What is your sampling rate? How much sampling jitter is there?

Jerry
--
Engineering is the art of making what you want from things you can get.
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From: mtr on 20 Jul 2010 10:40
1 -- 100 Mhz. Do not worry about sampling jitter, it would be small enough.
From: John on 20 Jul 2010 11:10
On Jul 20, 7:15 am, "mtr" <baranov.mv(a)n_o_s_p_a_m.gmail.com> wrote:
> Hello. We are making some sdr thing. So there is a need to catch carrier
> frequency for down shifting. We know nothing about baseband signal, except
> may be that it was digital or analogue modulated. Could anyone suggest any
> method?
> We're computing everything with modern pc, so there is no problem with
> arg(), log10(), sin()/cos(),  square or square root and so on.
>
> Thank you in advance

The most universal method is to provide a tuning knob and a
constellation display.
From: Vladimir Vassilevsky on 20 Jul 2010 11:25


mtr wrote:

> 1 -- 100 Mhz. Do not worry about sampling jitter, it would be small enough.

Do not worry about carrier recovery. Your SDR won't work anyway.
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