On 29.04.2014 23:22, zielalaoui wrote:
Hi all, I am trying to build transmission on air by using USRPs N210. The transmission is good with MPSK modulations but when i try to use 16_QAM i could not receive data (0 bytes at the reception). I tried to adapte transmission power, gain at the tranmitter, gain at receiver, samp_rate but the reception file still always empty. This is my flow graph: Tx: file source => packet encoder => QAM mod => mult constant = 0.4 => UHD usrp sink Rx : UHD usrp source => QAM demod => packet decoder => file sink samp_rate= 2M samples/symbol = 8 centre frequency=2.4G Any proposition will be appreciate Thanks to all
There are lots of things that can go wrong. At 16-QAM, you'll likely have some bit error, and you have no FEC to compensate for that.
Martin _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
