Hi Marcus Thanks for reply
>Your GRCs don't work for me. With which version of GNU Radio were they built? one is version 3.6.5.1 and the other one is version 3.7.2.1. I think the device addr in usrp sink and source should be changed.And also the file path in file sink and source should be changed according to ur system. >Thinking about this, that was a bad question from my side. >Since the ofdm_mod doesn't even *know* about the center frequency, the >signal generated digitally is always the same, so you can only be >looking at the rx side's abs(FFT). yeah,at rx side only >Would be nice if you had a description of what happens or a screenshot uploaded somewhere! These are the screen shots of FFT at 2.45GHz and 2.455GHz center frequencies. 2_45GHz.png <http://gnuradio.4.n7.nabble.com/file/n49851/2_45GHz.png> 2_455GHz.png <http://gnuradio.4.n7.nabble.com/file/n49851/2_455GHz.png> These are the screen shots of FFT at 2.452GHz and 2.454GHz center frequencies. 2_452GHz.png <http://gnuradio.4.n7.nabble.com/file/n49851/2_452GHz.png> 2_454GHz.png <http://gnuradio.4.n7.nabble.com/file/n49851/2_454GHz.png> >Ok, you're seeing frequency selective behaviour. This can happen for a >myriad of reasons, among these interference and multipath propagation. >You're excluding interference as a reason on an ISM band, so I presume >you're working with a direct cable between tx and rx or in an anechoic >chamber; thus multipath can't be the reason, either. No , I am not working with a cable between tx and rx or not in an anechoic chamber.But I can say there is no interference (as on ISM band) because when I run the benchmark_tx.py and benchmark_rx.py files ,then most of the packets are being received (i.e, n_right value is near to n_rcvd ) even at 2.452 and 2.454GHz center frequencies. chaitanya -- View this message in context: http://gnuradio.4.n7.nabble.com/OFDM-TRANSFER-and-RECEIVE-IN-GRC-tp49746p49851.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio