Dear Farid, please always respond on the mailing list. Thank you, Marcus Müller
On Sat, 2019-05-25 at 17:36 +0100, farid mihoub wrote: > 1- For the noise : in the TX side the output is in the order of 2A, > the noise 0.05A. > 2-Second even without noise, the const does not affect the > transmission, is there any sort of power normalization? > 3-For the FEC and the modulation I want to try my custom mapping > where information is linearly related to complex symbols, and my > application doesn't require error correction. > > Thank you. > > > 25.05.2019, 17:06, "Marcus Müller" <mmuel...@gnuradio.org>: > > 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 Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio