Hi All, I want to help my students fix an annual problem we have because our QSD SDR hardware designs can never get good enough image rejection. I want to do that by adding a GnuRadio flowgraph that uses some kind of LMS or other automatic algorithm (with more than two parameters) to automatically balance the I and Q signals. My students are designing QSD SDR radios that downconvert HF signals to audio for a sound card to digitize often using a Tayloe mixer. I want something like this: [cid:879b8ab1-bc90-4660-816e-d3d27d6da4e9] My problem with the above flowgraph is that it only optimizes the phase and amplitude at one frequency. I want it to optimize over the whole IF, so there are no glaring images in our spectragrams. I have seen a number of papers on doing this, but I'm looking for a quick GnuRadio solution I can put between the soundcard and Quisk. Does anyone have something like this we could try?
Thanks, Rob -- Rob Frohne, PhD PE School of Engineering Walla Walla University 100 SW 4th St College Place, WA 99324 (509) 527-2075<http://voice.google.com/calls?a=nc,%2B15095272075>
