Hi. this is a typical question like I'd ask it when talking a student through a test for a digital comms computer lab. So here's a hint:
"Constellations with very many points" don't always work. It has to do with SNR. Can you explain what the problem is with low SNR? Best regards, Marcus On 10.11.20 12:56, p...@koalatech.pt wrote: > Hi, I'm trying to make an OFDM transmission of a png file (9.3 kB) with > 256QAM with the gnuradio > example of OFDM transmitter / receiver. The USRP I'm using is the ettus > n210 with the cbx daughter board. With the QPSK and 16QAM modulations it > works, but with 64QAM or 256QAM I can´t receive the file, sometimes it > receives some packets but most of the time it doesn't receive any byte. > Can anyone help me with with this problem? > > Thanks in advance. > Pedro Viegas
