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From: | Abdalla Sokar |
Subject: | [Discuss-gnuradio] OFDM modulator o/p sampling rate |
Date: | Sun, 12 Jul 2009 04:45:38 -0700 (PDT) |
i am trying to transmit sound through OFDM system using the USRP i was able to transmit and receive audio in OFDM system without the USRP and also was able to transmit and receive audio using the USRP without OFDM when i try to merge the 2 system using the scope i see that there is a signal before the OFDM demod and no signal exactly after it and receive a timeout message i am thinking that this happen because the sampling rate before the USRP is not adjusted right for transmission(i am using 1 USRP and transmit and receive using a basic Tx and a basic Rx) so is there a way to know the output sampling rate exactly after the ofdm modulation? and if this was not the problem what may cause this problem? the ofdm modulator parameters fft length: 512 occupied tones:200 cyclic prefix:128 payload:0 (0=automatic) and the i/p is 32000 samples |
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