Hello Farid, On Sat, 2019-05-25 at 15:59 +0100, farid mihoub wrote: > Hello, > > In the OFDM_tx, rx examples in gr-digital : > 1- Why just a low level of noise affect the transmission and cause it > to stop.
"low" is relative. It seems it's high enough to cause packet losses, iff it's actually the noise. > 2- in the the Tx output and the Rx input no matter the value of the > multiply constant we apply > that would not affect our transmission. Then it's probably not only the noise! > 3- Is there any way to separate channel estimation and tracking from > data transmission, sometime I get the error "invalid packet > detected!" form the packet parser, also I need my data to bypass FEC > and QAM. Um, prior to QAM demodulation there is no data, and prior to FEC decoding there is no information bits, so I'm not sure what you want? > My purpose is to stream raw complex data to the I/Q components > directly. Then it seems you don't want an OFDM transceiver but maybe just simply a single IFFT? Not quite sure what you have in mind. Best regards, Marcus _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
