Rich, The test_corr_est block has the flow graph as follows: vector source-> constellation modulator -> stream mux(with null source) -> throttle -> channel model -> correlation estimator -> polyphase clock sync -> costas loop -> constellation and time gui sinks.
For my modified TX grc file I used the following flowgraph: vector source -> constellation modulator -> stream mux(with null source) -> constellation and time gui sinks as well as the UHD: USRP sink For the RX grc: UHD: USRP Source -> correlation estimator -> polyphase clock sync -> costas loop-> constellation and time gui sinks. The grc files can be found at: https://github.com/loganwashbourne/Logan.git The files are called test_corr_est_TX and test_corr_est_RX. Thanks for your time, Logan Washbourne Electrical Engineering Graduate Student (Electromagnetics) On Thu, Oct 1, 2015 at 3:44 AM, Richard Bell <richard.be...@gmail.com> wrote: > Hi Logan, > > Can you give more detail on your synchronization choices for BPSK so we > can tell you what more you may need to do? > > Rich > > Sent from my iPhone > > > On Sep 30, 2015, at 7:14 PM, Washbourne, Logan < > lwas...@ostatemail.okstate.edu> wrote: > > > > Hello, > > > > This is somewhat of an update to a previous post I made from last week. > After talking to Julian and Martin, it was made clear to me that I needed > to use a correlation system to insure my receiver would be synced up to my > transmitter when trying to communicate over the air. > > > > I am trying to utilize the Correlation Estimator block to help me > achieve those means. In order to ease myself into it, I am trying to turn > the test_corr_est.grc example into an over the air program. I am getting > communication between the transmitter and receiver(essentially I just split > the grc program in two and took out the throttle block and the channel > model and replaced them with UHD blocks). Now, I don't get any O's or L's > or an abundance of U's, and I can clearly see data coming in on the RX > side, but it seems to be a lot of noise, but noise generated by the TX > side, because it goes away when I stop transmitting. The center frequency > is 2.48GHz and the sample rate is 250k samples/sec. > > > > My testing method is plotting the constellation symbols right before > they get sent out on the TX side and then plotting them right after the UHD > block on the RX side. It is only bpsk and the symbols are covering all four > quadrants. > > > > I haven't changed any settings on the polyphase clock sync or the > modulation scheme. > > > > This is a little rambly but I appreciate your time, > > > > Logan Washbourne > > Electrical Engineering Graduate Student > > (Electromagnetics) > > > > _______________________________________________ > > Discuss-gnuradio mailing list > > Discuss-gnuradio@gnu.org > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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