Re: [Discuss-gnuradio] Cannot Achieve 50MSPS Sampling Rate

[Marcus D. Leech]

> > I was totally unaware of SIMD before you mentioned it. That's an
> > interesting subject. It is my understand that SIMD is integrated into
> > gnuradio through VOLK as of Dec. 2010. Doesn't look like I can use VOLK
> > directely from grc, or even from Python. Looks like it needs to be
> > implemented at the block level in C++. Is this the case?
The latest master GIT repo for Gnu Radio has integrated work to make 
many of the core
  functions SIMD-aware using Volk-based processing "kernels".  If you 
run the latest, you
  should already be benefitting from SIMD implementations of many core 
functions, including
  filtering, and basic math like complex add, multiply, etc.

But I wonder, given the apparent confusion about decimation whether you 
actually need very-high sample rates, or
  perhaps you have a misconception about what you really need out of a 
flow-graph.  For example, the sample-rate has
  very little to do with the final RF frequency you're "looking at" or 
generating.  Unless you're doing very-wideband
  spectral analysis, or have very-wideband signals to deal with (or any 
of a number of other interesting wideband applications
  like Radio Astronomy), you don't need any more bandwidth that will 
comfortably "fit" your signal(s) of interest.



--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org