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Re: [Discuss-gnuradio] GMSK Gaussian filter byte alignment?
From: |
Eric Blossom |
Subject: |
Re: [Discuss-gnuradio] GMSK Gaussian filter byte alignment? |
Date: |
Wed, 31 Oct 2007 17:02:50 -0700 |
User-agent: |
Mutt/1.5.9i |
On Wed, Oct 31, 2007 at 06:21:37PM -0400, George Nychis wrote:
> Hey all,
>
> I've been playing around with GMSK and reading through the code of the
> processing blocks. I see that the dot product code for the Gaussian
> filter is optimized such that it requires the data be 16-byte aligned.
> Where does this alignment actually occur in the processing chain?
>
> On the modulation path, the flow is NRZ->GF->FM:
> gr_bytes_to_syms()->gr_firdes::gaussian()->gr_frequency_modulator_fc()
>
> I'm assuming the data coming out of gr_bytes_to_syms() is not 16-byte
> aligned, yet the data that comes in to the Gaussian filter is 16-byte
> aligned. So, where does this alignment actually occur?
The buffers are all page aligned.
Eric