GMSK Gaussian filter byte alignment?

GNU Radio
1

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?

Thanks!
George

2

On Wed, Oct 31, 2007 at 06:21:37PM -0400, George N. wrote:

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