Hi! So there is no obvious fault, e.g. that I set the wrong decimation/interpolation rate? (the samplerate should be 400kS/s?)
I just compared "tx_ofdm.dat", recorded in your simulation, to my recorded file. Therefore I modified usrp_fft.py. In tx_ofdm.dat, it shows a large frequency band in use, as expected. Unfortunately, my file does not show the same behavior :-( It looks like gaussian noise with a small carrier in the middle. Maybe I did not setup correctly the transmit path. The first few seconds while recording, there were no signal transmission. This stage can be recognized in a waterfall diagram. It seems to me that "the gaussian noise" I saw could be the transmitted OFDM signal. > If you want to start playing around with it, benchmark_ofdm.py does a > loopback simulation with optional AWGN and multipath channels between the Tx > and Rx blocks. We're hoping to inject some quiet time into this simulation > to test the signal acquisition capabilities. That is, we know that under > steady-state conditions we synchronize pretty well, but we don't know the > transient behavior when we first get s signal into the receiver. Good work! I studied the simulation for some hours, before I started to port the sim to use the usrp. > Yes, we've injected a lot of debug information here, but I thought the code > checked in had that output turned off. Are you using the newest code (and > yes, I did just check a few new things in that we didn't do before Matt > left). The debug information appear because I turned it on. I am working on the latest copy. > Thanks! It's a bit premature still, but I'm sure we'll all be glad for more > feedback as it comes together. If you like, I can give you further feedback from time to time. Dominik _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
