Hello everybody,
I' am trying to test and understand the OFDM Modulation implemented in GNU Radio. I'm using the deafult values, fft_lenth=512, occupied_tones =200, cp_length= 128 and bpsk modulation, besides, I'm using a RFX900 Daughterboards on USPR and I'm connecting the TX and RX with a coaxial cable. I try to send a package of 1024 bytes but I'm not receiving all packets, always lost the first packet and then is a little bit random, sometimes I receive and I demodulated the 2º,3º,4º package and lost 5º, or lost 3º and recive ok 2 ºand 4º... I don't know what are happening, because I don't know how the OFDM implementation map the 1024 bytes onto 200 carriers of data. If I'm understanding the OFDM theory, with a bpsk modulation each carrier are modulated for two bits and my OFDM symbol length are 512+128 (fft_length+cp_length).So, ¿with 2 bits per data carrier (200), each symbol transport 400 bits, 50 bytes? That can´t be true because I receive some packages with no errors. Somebody can explain me, How works OFDM Modulation implemented in GNU Radio? -- View this message in context: http://old.nabble.com/OFMD-TX-and-RX-tp28871027p28871027.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
