On Fri, Dec 7, 2012 at 12:28 PM, Thomas Tsou tom@tsou.cc wrote:
On Wed, Dec 5, 2012 at 10:13 PM, Thomas Tsou tom@tsou.cc wrote:
Please try the last commit at
git://github.com/ttsou/openbts-p2.8.git laurent
I tested with 4 samples per symbol as we did in the past. Reducing the start/end phase error involved adding bits so that there is no partial phase transition to/from nothing. We then zero out the excess bits with a simple power mask.
It turns out that the transmit tester likes this signal, but my handsets do not; they do not even recognize it. Perhaps this form of testing is not as reliable as I thought.
So I reverted the commit to handle start/end phase errors. I also setup the correlators with single pulse (I see no benefit for the more complicated modulator on receive), and set timing for 4sps. I receive RA and normal bursts fine. The start/end transients will need to be handled a different way.
Ok, we've tested 'laurent' branch and it works great for both Rx and Tx, thanks!
Have you had any success with fixing ramp up / ramp down issue?
-- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru