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Re: [Discuss-gnuradio] Correlation Estimation Block Oddity
From: |
Andy Walls |
Subject: |
Re: [Discuss-gnuradio] Correlation Estimation Block Oddity |
Date: |
Wed, 29 Apr 2015 13:08:50 -0400 |
On Wed, 2015-04-29 at 09:09 -0700, Johnathan Corgan wrote:
> On Wed, Apr 29, 2015 at 8:50 AM, Richard Bell
> <address@hidden> wrote:
>
> Thanks for replying. The question is, how do I do this? We
> both agree the zeros need to go. What I'm not sure on is how
> to do that. I'd rather keep this contained to GRC, because I
> don't like maintaining python files not connected to grc. Can
> you explain how you do this or provide an example?
>
>
> Since GRC parameters can be Python expressions, you can use formulas
> to do this.
>
>
> If 'seq' is the original sequence to be modulated, use 'seq+seq' in
> the parameter to the modulate_vector variable block.
>
>
> If the variable is named 'mod_vec', use:
>
>
> mod_vec[len(mod_vec)/2:]
>
>
> ...as the taps for the correlation estimator.
John,
Thanks.
On a related note, I just tested the PSK modulator and it does generate
a long lead-in of zeros. :/
The GMSK modulator "digital.gmskmod_bc(sps, pulse_duration, bt)", which
I usually use, doesn't do this. I can see some lead-in due to the BT
and pulse duration, but I expect that.
Scanning the python code under gr-digital, it looks something in the
generic_mod might account for those leading zeros. The GMSK modulator
doesn't use the generic_mod class.
Regards,
Andy
- Re: [Discuss-gnuradio] Correlation Estimation Block Oddity, (continued)
- Re: [Discuss-gnuradio] Correlation Estimation Block Oddity, Andy Walls, 2015/04/23
- Re: [Discuss-gnuradio] Correlation Estimation Block Oddity, Andy Walls, 2015/04/24
- Re: [Discuss-gnuradio] Correlation Estimation Block Oddity, Richard Bell, 2015/04/27
- Re: [Discuss-gnuradio] Correlation Estimation Block Oddity, Richard Bell, 2015/04/27
- Re: [Discuss-gnuradio] Correlation Estimation Block Oddity, Richard Bell, 2015/04/28
- Re: [Discuss-gnuradio] Correlation Estimation Block Oddity, Johnathan Corgan, 2015/04/28
- Re: [Discuss-gnuradio] Correlation Estimation Block Oddity, Richard Bell, 2015/04/29
- Re: [Discuss-gnuradio] Correlation Estimation Block Oddity, Johnathan Corgan, 2015/04/29
- Re: [Discuss-gnuradio] Correlation Estimation Block Oddity,
Andy Walls <=